A-Z Guide To Grease Fitting Types, Sizes & Thread Identification

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Table of Contents
A-Z guide to grease fitting types, sizes & threadidentification...........................................2
I. Grease fitting basics.............................................................................................................2
1.1. Functions........................................................................................................................2
1.2. Design..............................................................................................................................2
1.3. Material ..........................................................................................................................3
II. Grease fitting thread identification................................................................................4
2.1. Types of grease fitting threads....................................................................................4
2.2. How to identify grease fitting thread.........................................................................5
III. Types and sizes of grease fittings....................................................................................9
3.1. 1/4”- 28 taper thread fittings.......................................................................................9
3.2. 1/4”- 28 straight thread fittings.................................................................................12
3.3. Metric grease fittings..................................................................................................13
3.4. Flush type grease fittings...........................................................................................15
3.5. Button head grease fittings........................................................................................17
3.6. Hydraulic shut-off grease fittings.............................................................................19
3.7. Special thread grease fittings....................................................................................20
3.8. Pin type grease fittings...............................................................................................21
3.9. Leakproof grease fittings...........................................................................................23
3.10. 1/8” PTF grease fittings..............................................................................................25
3.11. 1/4″ PTF grease fittings.............................................................................................29
3.12. Pressure relief grease fittings....................................................................................30
3.13. Thread forming grease fittings.................................................................................32
3.14. Drive type grease fittings...........................................................................................34
3.15. Monel grease fittings...................................................................................................37
3.16. Air vent grease fittings...............................................................................................39
3.17. Double head grease fittings........................................................................................41
3.18. Stainless steel grease fittings......................................................................................42
4. Grease fittings tips.................................................................................................................44
5. FAQs........................................................................................................................................45
6. To sum up ...............................................................................................................................46

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A-Z guide to grease fitting types, sizes &
thread identification
Most of the time, finding the ideal grease fittings for your use is easier said than done.
The reason is that they come in many different types, sizes, and distinctive functions.
Although grease fittings are fundamental to proper machine lubrication, harm and
damage could ensue if they are misused. Spotting the most suitable grease fitting may
seem like a challenging task but take it easy!
With this article, you will learn how to identify grease fittings and navigate your grease
fittings selectionproperly. So, let’s dive in and find the right parts for you!
I. Grease fitting basics
1.1. Functions
A grease fitting, sometimes called a Zerk fitting, grease nipple, or Alemite fitting is a
small metal fixture used on mechanical assemblies. It provides lubrication to internal
parts without leaks or overspill. Adding lubricants to mechanical systems helps improve
their efficiency.
The grease fittings remain closed until the pressure from the grease gun opens them to
dispense grease into the system’s moving parts, greatly reducing the possibilities of
machinery failure.
1.2. Design
Grease fittings are set in place by a threaded connection. Inside the fitting, a small captive bearing
ball is pushed against a retaining spring by the grease gun’s pressure.
The setup operates as a pathway that allows the grease to flow to the bearing. When the pressure
releases, the bearing ball returns to the tip.

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The bearing ball blocks dirt and other wastes from entering the bearing. It also acts as a check valve
that creates a seal, obstructing the grease from flowing back out of the fitting.
Grease fittings are attached to a grease gun to administer a pressure-resistant connection. Also, they
have a channel behind the opening that runs straight to the area where you need to grease.
1.3. Material
Most grease fittings are made of zinc-plated steel, stainless steel, carbon steel, mild steel, or brass.
Some variations also have a supplemental coating of chromate to limit corrosion and improve
durability.

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II. Grease fitting thread identification
2.1. Types of grease fitting threads
There are many types of grease fitting threads available for use. But how can you be certain about the
functionality of your grease fitting thread assembly? Let’s learn how to identify common thread
types and how to choose the best for your application!
Threads are the ridges that wrap around the cylinder or cone and form a coil. There are six common
different types of threads:
+ BSPP (British Standard Pipe Parallel)
+ BSPT (British Standard Pipe Taper)
+ Metric parallel
+ Metric tapered
+ NPT/NPTF (National Pipe Thread/National Pipe Thread Fuel)
+ UN/UNF (United/United Fine)

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2.2. How to identify grease fitting thread
Keeping track of the six commonly used types of threads is not a simple task. It’s easy to select an
incorrect part accidentally, but the following text offers a few ways to get to the correct choice. Here
are some ways to identify the threads on your grease fittings:
With a grease fitting gauge
Using a specific tool called grease fitting thread gauge is the easiest method to determine the thread
on a grease fitting.
Grease fitting gauge – the easiest method to determine the thread on a grease fitting
This special tool helps save time and grants a simple way to distinguish one grease fitting thread
from another. It includes the standard metric sizes such as the UNF, the American standard, the
British standard, and many more.
Without a grease fitting gauge
Although having a grease fitting thread gauge is convenient, you can still identify the correct grease
fitting thread through various ways without needing this tool.
Parallel vs. Tapered
To determine if the thread is parallel or tapered, focus on its diameter. If the thread’s diameter runs
straight from top to bottom, the thread is parallel. But if the thread’s diameter gets narrower towards
the bottom, the thread is tapered.

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Straight thread (left) vs. tapered thread (straight)
Parallel Threads Tapered Threads
BSPP BSPP
Metric parallel Metric parallel
UN/UNF NPT/NPTF

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Thread pitch
The optimal way to compare the numerous threads is to use a pitch gauge
The thread pitch is the number of threads per inch. A pitch gauge measures the distance between the
individual crests or the pitch of a thread, and it is the optimal way to compare the numerous threads.
Thread Type Pitch Size
BSPP 11, 14, 19, 28
BSPT 11, 14, 19, 28
Metric parallel 1.0, 1.5, 2.0
Metric tapered 1.0, 1.5, 2.0
NPT/NPTF 11½, 14, 18, 27
UN/UNF 12, 14, 16, 18, 20, 24

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Thread diameter
A caliper tool is handy for measuring the thread diameter of your grease fitting. In addition, it is a
simple two-part tool that can measure the internal and external diameters of objects.
Measure the internal and external diameters of grease fittings with a caliper
Use the lower jaw of your caliper to measure the external diameter of your grease fitting. The
diameter of your grease fitting would be the point where the 0 (zero) mark of your caliper’s slider is
pointed at.

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III. Types and sizes of grease fittings
Learning the different types and sizes of grease fittings is an important step, but it will be a little
confusing. In this breakdown, we will introduce you to various grease fittings that provide the world
with a quick and functional greasing procedure. Let’s explore some of the grease fitting assortments.
3.1. 1/4”- 28 taper thread fittings
¼”-28 taper thread fittings are usually zinc-plated. They are suitable for use in
automobiles and other kinds of commercial machinery. Some of its features include a
dirt-repellent ball check and a maximum pressure range of 10,000 psi.
Alemite # Lincoln
#
SAE
#
Descriptions Type Thread FIG. Overall
Length
(A)
Shank
Length
(S)
Hex
Size
(H)
1637-B1 5210 H-145 1/4"-28 SAE
45 degree
45° 1/4"-28
Taper
(SAE-
LT)
2 27/32" 7/32" 3/8"
1641-B 5010 H-100 1/4"-28 SAE
straight
Straight 1/4"-28
Taper
(SAE-
LT)
1 35/64" 3/16" 5/16"
1652-B 5013 H-
100-
RLA
1/4"-28 SAE
long thread
Straight 1/4"-28
Taper
4 11/16" 23/64" 5/16"

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(SAE-
LT)
1680-B 5014 H-
100-
LMA
1/4"-28 SAE
medium long
Straight 1/4"-28
Taper
(SAE-
LT)
4 31/32" 5/8" 5/16"
1698-B 5017 H-
100-
LA
1/4"-28 SAE
long
Straight 1/4"-28
Taper
(SAE-
LT)
4 1-1/8" 25/32" 5/16"
1911-B1 5410 H-
190-A
1/4"-28 SAE
90 degree
90° 1/4"-28
Taper
(SAE-
LT)
3 3/4" 7/32" 3/8"
3010-B1 700396 H-
165-
RL
1/4"-28 65°
long thread
65° 1/4"-28
Taper
(SAE-
LT)
2 13/16" 19/64" 3/8"
3014-B N/A H-
100-
LLA
1/4"-28
straight very
long
Straight 1/4"-28
Taper
(SAE-
LT)
4 1-5/8" 1" 5/16"

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N/A 5311 H-165 1/4"-28 SAE
65 degree
60° 1/4"-28
Taper
(SAE-
LT)
2 3/4" 7/32" 3/8"

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3.2. 1/4”- 28 straight thread fittings
¼”-28 straight thread fittings are zinc-plated fittings frequently used in cars and a range
of industrial equipment.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
333330 N/A H-
100-
28-
LA
1/4"-28 UNF-
2A straight
Straight 1/4"-28
UNF-
2A
1 17/32" 3/16" 17/32"
369609 N/A H-
100-
28-C
1/4"-28 UNF-
2A straight
Straight 1/4"-28
UNF-
2A
1 7/16" 1/8" 5/16"
1770-
B1
N/A H-
145-
CU
1/4"-28 UNF-
2A 45 degree
45° 1/4"-28
UNF-
2A
2 41/64" 1/8" 3/8"
1792-B 5527 H-
100-
28
1/4"-28 UNF-
2A straight
Straight 1/4"-28
UNF-
2A
1 33/64" 5/32" 9/32"

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3.3. Metric grease fittings
Metric grease fittings sometimes called metric hydraulic fittings and metric zerks can
take the pressure up to 10,000 psi. Their material is often regular and stainless steel. You
can find this type of fitting in industrial machinery, rugged automotive, and agricultural
applications.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
2109 5181 M10-
1-AM
10mm x 1mm
/ straight
Straight 10mm x
1mm
1 15.2mm 5.9mm 11mm
2110 5182 M10-
45-
AM
10mm x 1mm
/ 45 degree
45° 10mm x
1mm
2 23.5mm 5.5mm 11mm
2111 5183 M10-
90-
AM
10mm x 1mm
/ 90 degree
90° 10mm x
1mm
3 19.0mm 5.5mm 11mm
2106 5175 M6-1-
AM
6mm x 1mm /
straight
Straight 6mm x
1mm
1 13.5mm 4.6mm 7mm

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2107 5176 M6-
45-
AM
6mm x 1mm /
45 degree
45° 6mm x
1mm
2 22.6mm 5.5mm 9mm
2108 5177 M6-
90-
AM
6mm x 1mm /
90 degree
90° 6mm x
1mm
3 18.0mm 5.5mm 9mm
2103 5178 M8-1-
AM
8mm x 1mm /
straight
Straight 8mm x
1mm
1 14.7mm 5.6mm 9mm
2104 5179 M8-
45-
AM
8mm x 1mm /
45 degree
Straight 8mm x
1mm
2 14.9mm 5.8mm 9mm
2105 5180 M8-
90-
AM
8mm x 1mm /
90 degree
90° 8mm x
1mm
3 17.8mm 5.5mm 9mm

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3.4. Flush type grease fittings
Flush type grease fittings are suited for machines where protruding fittings cannot be
equipped, such as pulleys, shafts, and other rotating bearings. Flush fittings are not
susceptible to erosion since they don’t protrude from the surface like other fittings.
Alemite
#
Lincoln
#
SAE
#
length
(O)
Shank
length
(S)
1452 N/A AH-
18FLMA
1/8"-NPTF
Slotted Thread
Slotted 1/8"-
NPTF
2 17/32" N/A
1814 N/A AK-516F 5/16" Drive,
no thread
Straight Drive
(No
Thread)
7 21/64" 9/32"
1815 N/A AH-18F 1/8"-NPTF
Slotted Thread
Slotted 1/8"
NPTF
1 23/64" 19/64"
1851 700392 AH-
1428FJ
1/4"-28 U.N.F 1/4"-28
U.N.F
10-32
U.N.F
4 13/32" 19/64"
1877 700397 AK-
18FC
1/8" Drive,
Slotted Thread
Straight Drive
(No
Thread)
6 11/64" 1/8"
1885 700502 AK-14-
FJ-1
1/4" Drive,
Slotted Thread
Straight Drive
(No
Thread)
7 9/32" 15/64"

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3036 N/A AH-316F 3/16"-Drive Straight Drive 6 3/8" 5/16"
N/A 700502A AH-
1032FJ
10-32 U.N.F
Slotted Thread
Straight 10-32
U.N.F
N/A 11/32" 15/64"
Z741-A N/A AH-14F 1/4"-NPTF
Slotted Thread
Slotted 1/4"-
NPTF
3 9/16" N/A

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3.5. Button head grease fittings
Button head grease fittings can be for strenuous applications such as heavy machinery
and high-powered equipment. They are appropriate for delivering high amounts of
lubrication for smooth and fluid work.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
1823 N/A H-
300-
CBG
1/4"-NPTF Straight
(Giant)
1/4"-
NPTF
1 1-9/32" 35/64" 7/8"
1831 N/A H-
200-
CBG
1/8"-NPTF Straight
(Giant)
1/8"-
NPTF
1 1-3/16" 29/64" 7/8"
1820-1 N/A H-
500-
CBG-
SS
1/2"-NPTF
(STAINLESS)
Straight
(Giant)
1/2"-
NPTF
1 1-1/16" 1/2" 7/8"
1822-
A1
N/A H-
400-
CBG
3/8"-18 NPTF Straight
(Giant)
3/8"-18
NPTF
1 1-5/16" 9/16" 7/8"

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A1184 5700/5701 H-
200-
CB
1/8"-NPTF Straight 1/8"-
NPTF
1 3/4" 23/64" 5/8"
A1186 5706 H-
300-
CB
NPTF
1 27/32" 7/16" 5/8"
A1188 5711 H-
400-
CB
NPTF
1 1-1/16" 37/64" 3/4"
A1190 N/A H-
500-
CB
NPTF
1 1-1/16" 35/64" 7/8"
C-69 N/A H-
200-
CBRI
1/8"-NPTF
FEMALE
Straight 1/8"-
NPTF
1 31/32" 13/32" 5/8"
M1184 N/A H-
200-
CB-
MON.
1/8"-PTF
(MONEL)
Straight 1/8"-
PTF
1 3/4" 11/32" 5/8"

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3.6. Hydraulic shut-off grease fittings
Hydraulic shut-off fittings are often suitable for bearing seals in water pumps. These
fittings shut off at certain pressure levels, therefore restrictingover-greasing and over-
pressurization of the bearing seals.
Alemite
#
SAE
#
length
(O)
Shank
length
(S)
Hex
size
(D)
Shut-off
Pressure
(psi)
1795-B H-
260-
SO2
1/8" PTF /
60° Angle
60° 1/8"
PTF
1 1" 17/64" 5/8" 5-20 lb
1940-B H-
260-
SO1
1/8" PTF /
60° Angle
60° 1/8"
PTF
1 1" 17/64" 5/8" 60-110 lb

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3.7. Special thread grease fittings
Special thread grease fittings are special threads and sizes for specific greasing usage.
They are suited for matching corresponding straight threads. Moreover, most of them
include a high-pressure ball check and you can customize the special threads to fit almost
any use.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
3016 N/A H-1032 10-32 UNF-2A
straight
Straight 10-32
UNF-2A
1 1/2" 1/8" 1/4"
3018 N/A H-640 6-40 UNF-2A
straight
Straight 6-40
UNF-2A
1 1/2" 9/64" 1/4"
1631-B N/A H-51632 5/16"-32
UNEF-2A
straight
Straight 5/16"-32
UNEF-
2A
1 21/32" 7/32" 3/8"
1648-
B1
N/A H-
5163265
5/16"-32
UNEF-2A, 65
degree
65° UNEF-
2A
2 51/64" 7/32" 3/8"
1711-B 5061 H-51624 5/16"-24 UNF-
2A straight
Straight 5/16"-24
UNF-2A
1 21/32" 1/4" 3/8"

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3.8. Pin type grease fittings
Pin type grease fittings include a cross pin that creates a lock to allow no room for leaks.
Pin type grease fittings were one of the first zerks developed and still being used in
automobiles today.
Alemite
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
A336 H-
200-
PIN-B
1/8" PTF / str. (brass
body / steel pin &
ball)
Straight 1/8"
PTF
1 31/32" 17/64" 7/16"
A358 H-
290-
PIN-B
1/8" PTF / 90 degree
(brass)
90° 1/8"
PTF
2 1-1/16" 17/64" 1/2"
A359 H-
300-
PIN-B
1/4" NPTF / straight
(brass)
Straight 1/4"
NPTF
1 11/32" 17/64" 17/32"
A361 H-
390-
PIN-N
1/4" NPTF / 90 deg.
(steel/ nickle)
90° 1/4"
NPTF
2 1-5/16" 3/5" 9/16"

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A684 H-
245-
PIN-B
1/8" PTF / 45 degree
(brass)
45° 1/8"
PTF
N/A 1-1/2" 5/16" 1-
9/16"
M336 H-
200-
PIN-M
1/8" PTF / str. (brass
body / brass pin &
ball)
Straight 1/8"
PTF
1 31/32" 17/64" 7/16"

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3.9. Leakproof grease fittings
Leakproof grease fittings prevent lubricant leaks and keep external particles from
entering the channel. Besides, this type of fitting is suitable for operations where having
firm seals is critical, like in the food and textile industries. A dust cap is a recommended
accessory.
Alemite
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
1634 H-200-
1634
1/8"-PTF Straight 1/8" NPT 1 27/32" 23/64" 7/16"
1650 H-200-LP 1/8"-NPT Straight 1/8" NPT 1 29/32" 25/64" 7/16"
1692 H-230-LP 1/8"-NPT 30
degree
30° 1/8" NPT 2 1-7/32" 25/64" 7/16"
1693 H-290-LP 1/8"-NPT 90
degree
90° 1/8" NPT 3 31/32" 25/64" 7/16"
369533 CONE-
LP
7/16" round, no
thread
Straight 7/16"
Round
1 55/64" N/A 7/16"
369619 H-100-LP 1/4"-28 taper
thread
Straight 1/4"-28
Taper
1 37/64" 5/16" 7/16"

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1634-B H-200-
1634-B
1/8"-PTF,
surface ball ck
Straight 1/8" NPT 1 1" 33/64" 7/16"

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3.10. 1/8” PTF grease fittings
1/8” PTF grease fittings fit in industrial equipment and heavy machinery. They include a
zinc coating and a special dust-proof cap.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
1649 N/A H-265-
LLA
1/8"-PTF 65°
very long
65° 1/8" PTF
SAE
Special
Short
2 2-3/4" 2-1/4" 3/8"
1958 N/A H-200-
DR
1/8"-PTF str.
dustproof
Straight 1/8" PTF
SAE
Special
Extra
Short
N/A 1" 5/16" 7/16"
1606-B N/A H-290-
LMA
1/8"-PTF 90
medium long
90° 1/8" PTF
SAE
Special
Short
3 1-1/4" 1-1/4" 7/16"
1607-B 5003 H-200-
LM
1/8"-PTF
medium long
Straight 1/8" PTF
SAE
4 1-1/4" 25/32" 7/16"

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Special
Short
1610-BL 5000 H-200 1/8"-PTF
straight
Straight 1/8" PTF
SAE
Special
Extra
Short
1 11/16" 19/64" 7/16"
1611-B 6004 H-230 1/8"-PTF 30
degree
30° 1/8" PTF
SAE
Special
Short
2 15/16" 19/64" 7/16"
1612-B 5300 H-265-
A
1/8"-PTF 65
degree
65° 1/8" PTF
SAE
Special
Short
2 27/32" 19/64" 7/16"
1613-B 5400 H-290 1/8"-PTF 90
degree
90° 1/8" PTF
SAE
Special
Short
3 53/64" 19/64" 7/16"
1618-B 5505 H-200-
RI
1/8"- NPTF
internal thread
Straight 1/8" NPT
Female
N/A 1" 5/16" 1/2"

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1620-B N/A H-245-
RI
1/8"-NPTF 45°
female thrd
45° 1/8" PTF
SAE
Special
Short
N/A 1-1/8" 13/32" 7/16"
1623-B N/A H-265-
LM
1/8"-PTF 65°
med. long
65° 1/8" PTF
SAE
Special
Short
2 1-7/32" 9/16" 7/16"
1638-B 5200 H-230-
LMA
1/8"-PTF 30°
med. long
30° 1/8" PTF
SAE
Special
Short
2 2" 1-1/4" 7/16"
1644-B N/A H-200-
C
1/8"-PTF
straight short
Straight 1/8" PTF
SAE
Special
Extra
Short
1 9/16" 15/64" 7/16"
1669-B 5007 H-200-
LA
1/8"-PTF long Straight 1/8" PTF
SAE
Special
Short
4 1-3/4" 1-15/64" 7/16"

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1684-B 5009 H-200-
LLA
1/8"-PTF very
long
Straight 1/8" PTF
SAE
Special
Short
4 2-5/8" 2-1/32" 7/16"
1688-B 5200 H-245 1/8"-PTF 45
degree
45° 1/8" PTF
SAE
Special
Short
2 27/32" 19/64" 7/16"

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3.11. 1/4″ PTF grease fittings
¼” PTF grease fittings are extensively used in hefty machinery with bigger bearings with
heavy lubricant supplication and for cold weather operations.
Alemite
#
Lincoln
#
SAE
#
Description Type Thread FIG. Overall
length
(O)
Shank
length
(S)
Hex
size
(H)
1629-C N/A H-
390
1/4"-PTF 90
DEGREE
90° 1/4"-
PTF
3 15/16" 3/8" 9/16"
1629-B 5350 H-
365
1/4"-PTF 65
DEGREE
65° 1/4"-
PTF
2 1-1/16" 3/8" 9/16"
1627-B 5050 H-
300
1/4"-PTF Straight 1/4"-
PTF
1 7/8" 27/64" 9/16"

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3.12. Pressure relief grease fittings
Pressure relief fittings function as relief vents releasing pressure building up in bearing
housings or gearboxes. An internal valve opens and releases pressurized air.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
47100 N/A H-200-
47100
1/8"-PTF. Straight 1/8"
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
47200 N/A H-200-
47200
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
47640 N/A H-200-
47640
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
50500 N/A H-200-
50500
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"

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317400 N/A H-200-
317400
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
321839 N/A K-38-
321839
3/8" DRIVE. Straight 1/8"
PTF
SAE Spl
Short
2 1/2" N/A N/A
323060 N/A H-200-
323060
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
338382 N/A H-200-
338382
1/8"-PTF.
LEAKPROOF
Straight 1/8"
PTF
SAE Spl
Short
3 9/16" 11/32" 7/16"
N/A 5677 H-200-
5677
PTF
SAE Spl
Short
1 1/2" 19/64" 7/16"
N/A 5678 H-200-
5678J
PTF
1 12.7 7.1 7/16"

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3.13. Thread forming grease fittings
Thread forming fittings, also called spin drive fittings, have hardened threads for
insertion into holes with no threads. Besides reducing costs, inserting thread forming
fittings into unthreaded holes provide a stronger grip. Thread forming fittings are great
for high-pressure oil applicators. You can use them for industrial machinery and heavy
equipment.
Alemite
#
Lincoln
#
SAE
#
Length
(A)
Shank
Length
(B)
Hex
Size
(D)
3038-B 205010 H-100-
GM
1/4"-28
straight
Straight 1/4"-28
Spl.
Taper
1 9/16" 13/64" 5/16"
369582 N/A H-100-
C-GM
1/4"-28
straight short
Straight 1/4"-28
Spl.
Taper
1 0.51 0.12 9/32"
369584 N/A H-100-
LMA-
GM
1/4"-28,
straight med.
long
Straight 1/4"-28
Spl.
Taper
1 0.97 0.21 5/16"
328435 700337 H-100-
GMPL
1/4"-28 plug Straight 1/4"-28
Spl.
Taper
1 5/16" 3/16" 9/32"

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3053-B 205210 H-145-
GM
1/4"-28 45
degree
45° 1/4"-28
Spl.
Taper
2 13/16" 3/16" 3/8"
3054-B 205410 H-190-
GM
1/4"-28 90
degree
90° 1/4"-28
Spl.
Taper
3 23/32" 13/64" 3/8"
1720-B 205000 H-200-
GM
1/8" PTF
straight
Straight 1/4"-28
Spl.
Taper
1 5/8" 1/4" 7/16"
369579 N/A H-200-
LMA-
GM
1/8" PTF
straight med.
long
Straight 1/4"-28
Spl.
Taper
1 0.68 0.21 7/16"
1724-B 5300 H-245-
GM
1/8" PTF 45
degree
45° 1/4"-28
Spl.
Taper
2 27/32" 13/64" 7/16"
1722-B N/A H-265-
GM
1/8" PTF 65
degree
65° 1/4"-28
Spl.
Taper
2 3/4" 13/64" 7/16"
1723-B 205400 H-290-
GM
1/8" PTF 90
degree
90° 1/4"-28
Spl.
Taper
3 3/4" 13/64" 7/16"

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3.14. Drive type grease fittings
Drive type grease fittings, also referredto as push-in grease fittings, are perfect for low or
moderate pressure operations. They have serrated shanks for a strong grip.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(B)
Hex
Size
(H)
1633 5026 K-316-
SBA
3/16"- drive,
no ball
Straight 3/16"
Drive
1 5/8" 1/4" 5/16"
1666 5036 K-38-
SBA
3/8"- drive,
no ball
Straight 3/8"
Drive
1 37/64" 7/32" 7/16"
1699 5030 K-516-
SBA
5/16"- drive,
no ball
Straight 5/16"
Drive
1 5/8" 7/32" 3/8"
1736 N/A K-18-
SBA
1/8"- drive,
no ball check
Straight 1/8"
Drive
1 9/16" 1/4" 5/16"
1744 5318 K-14-
65-N
1/4"- drive 65
degree
Straight 1/4"
Drive
3 49/64" 9/32" 1/4"
1952 700313 K-14-
CCSBA
1/4"- EXT.
short, no ball
Straight 1/4"
Drive
1 15/32" 1/8" 11/32"

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3005 700375 K-316-
MSBA
3/16"- med.
short, no ball
Straight 3/16"
Drive
1 .468" .172" 5/16"
3006 N/A K-316-
CSBA
3/16"- drive
short, no ball
Straight 3/16"
Drive
1 .484" .219" 9/32"
3009 N/A K-316-
CCSBA
3/16"- extra
short, no ball
Straight 3/16"
Drive
1 .390" .105" 5/16"
3019 N/A K-18-
CSBA
1/8"- drive
short, no ball
Straight 1/8"
Drive
1 15/32" 5/32" 5/16"
321381 5044 K-14-
SBA
1/4"- drive,
no ball
Straight 1/4"
Drive
1 35/64" 1/4" 11/32"
1608-B 5031 K-516-
N
5/16"- drive Straight 5/16"
Drive
1 9/16'' 17/64" 3/8"
1630-
B1
N/A K-516-
65-N
5/16"- drive
65 degree
65° 5/16"
Drive
3 23/32" 7/32" 3/8"
1646-
B1
5385 K-316-
65-N
3/16"- drive
65 degree
60° 3/16"
Drive
3 23/32" 7/32" 3/8"
1728-B 5033 K-316-
A
3/16"- drive Straight 3/16"
Drive
1 33/64" 1/4" 5/16"
1743-B 5029 K-14A 1/4"- drive Straight 1/4"
Drive
1 35/64" 1/4" 5/16"

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1992-
B1
N/A K-316-
45-N
3/16"- drive
45 degree
45° 3/16"
Drive
2 53/64" 7/32" 3/16"

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3.15. Monel grease fittings
Monel grease fittings are excellent at repelling wear and corrosion, especially in
industrial settings. Monel fittings’ materials are from nickel or copper. For easy
recognition, they feature a single notch on the hex. Because of its corrosionresistance,
monel grease fittings are great for caustic environments. Moreover, some good examples
of these environments are chemical factories or seaside ports.
Alemite
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
1921-B H-230-
MONEL
1/8"-PTF 30
degree
30° 1/8" PTF 2 1-1/4" 11/32" 7/16"
1922-B H-267-
MONEL
1/8"-PTF 67 1/2
degree
67.5° 1/8" PTF 2 61/64" 11/32" 7/16"
1966-B H-100-
MONEL
1/4"-28 SAE
straight
Straight 1/4"-28
Taper
1 17/32" 3/16" 5/16"
1923-B H-290-
MONEL
1/8"-PTF 90
degree
90° 1/8" PTF 3 7/8" 11/32" 7/16"

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1961-B H-200-
MONEL
1/8"-PTF
straight
Straight 1/8" PTF 1 3/4" 5/16" 7/16"
1962-B H-200-C-
MONEL
1/8"-PTF str.
short
Straight 1/8" PTF 1 5/8" 9/32" 7/16"
1968-B H-145-
MONEL
1/4"-28 SAE
45°
45° 1/4"-28
Taper
2 13/16" 13/64" 5/8"
1969-B H-190-
MONEL
1/4"-28 SAE 90
degree
90° 1/4"-28
Taper
3 3/4" 13/64" 3/8"

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3.16. Air vent grease fittings
Air vent grease fittings allow air to enter and exit while preventing dirt and other particles
from infiltrating. You can use air vents on mechanical devices such as differentials,
transmissions, and gearboxes.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Opening
Pressure
300805 N/A H-200-
300805
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 1 0.19 Felt Filter
301370 5698 H-200-
VENT
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 0.78 0.28 N/A
304810 N/A H-200-
304810
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 1 0.19 1-3" Water
324970 N/A K-
324970
DRIVE
VENT
Straight Drive 1 1 0.8 6-12"
Water
327240 N/A H-200-
327240
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 1 0.19 1 to 1-1/2
psi

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330766 N/A H-200-
330766
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 1 0.19 2-1/2 to 4
psi
131000-
T
N/A H-200-
131000-
T
1/8" PTF
VENT
Straight 1/8" PTF
SAE Spl
Short
1 1 0.19 12"
Water
Max.

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3.17. Double head grease fittings
Double head fittings provide another head for doubling the lubricant supply. They
include a ball check to keep out debris. Its two heads are great when you need to apply
grease at two times the speed. It can also be used when two alternating or simultaneous
greasing is necessary.
Alemite
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
369574 H-270-
DH
1/8" PTF / 70
DEGREE
70° 1/8"
PTF
27/32" 19/64" 1/2"

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3.18. Stainless steel grease fittings
Stainless steel fittings are made from stainless steel, which is resilient to weathering and
corrosion. Besides, stainless steel fittings can tolerate extreme temperatures. They feature
two notches for easy recognition. The materials of stainless-steel fittings make them great
for high corrosionenvironments such as seaside or chemical plants. It is also easier to
clean thanks to its stainless body.
Alemite
#
Lincoln
#
SAE
#
Length
(O)
Shank
Length
(S)
Hex
Size
(H)
1921-S N/A H-
230-
SS-
AM
1/8"-PTF 30
degree
30° 1/8"-
PTF
2 1.25" .34" 7/16"
1922-S N/A H-
267-
SS-
AM
1/8"-PTF 67
1/2 degree
67° 1/8"-
PTF
2 .95" .34" 7/16"
1923-S N/A H-
290-
SS-
AM
1/8"-PTF 90
degree
90° 1/8"-
PTF
3 .82" .27" 7/16"

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1961-S 5000-9 H-
200-
SS-
AM
1/8"-PTF
straight
Straight 1/8"-
PTF
1 .62" .25" 7/16"
1966-S 5010-9 H-
100-
SS-
AM
1/4"-28 SAE
straight
Straight 1/4"-28
Taper
Thread
1 .54" .20" 5/16"
1968-S 5210-9 H-
145-
SS-
AM
1/4"-28 45
degree
45° 1/4"-28
Taper
Thread
2 .88" 0.2'' 3/8"
1969-S 5410-9 H-
190-
SS-
AM
1/4"-28 90
degree
90° 1/4"-28
Taper
Thread
3 .69" .20" 3/8"
N/A 5033-9 K-
316-
SS-
AM
3/16"-DRIVE Straight 3/16"
Drive
4 .50" .21" 5/16"

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4. Grease fittings tips
Before finding the right grease fitting, you must first determine what kind of grease
fitting thread you will use. You can choose from several kinds of thread components
available. The thread fittings are commonly used in the BSPP, BSPT, metric parallel,
metric tapered, NPT/NPTF, and UN/UNF.
After determining your fitting thread, then you can now choose from the many different
kinds of grease fittings, according to each of their particular features. There are also
various types of grease guns to use alongside grease fittings, including the lever, pistol-
grip, pneumatic, and cordless guns. Most of these guns are appropriate to use for any
application.
More importantly, keeping your grease fitting in its tip-top shape will help maintain its
effectiveness. Doing so will also help you save a ton of money in the long run. Here are
some tips on how you can properly maintain your grease fitting.
 Use a clean rag to wipe your fitting before installing it. A lint-free cloth would be
the best for this job.
 Regularly check your grease fittings and immediately replace any defective ones.
 As much as possible, use a common fitting type and size for similar applications.
 Use label tags to help you remember the type of grease the flows through each of
your grease fittings.
 Know the delivery capacity of your grease fitting and make sure not to exceed
them.
 Maintain your grease gun properly as well If you are using one. Avoid storing it in
moist and dirty areas. Cover them with a thick cloth or store them inside a hard
case if possible.
 Exercise extra caution and take safety measures when using your grease gun and
grease fitting.
 After using your grease gun, always wipe down your fitting to avoid
contamination of dirt and moisture.

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5. FAQs
1. Why does my grease gun get stuck in the fitting?
The gun gets stuck in the fitting because it is clogged by debris or hardened grease. It
would help if you clean grease fittings and grease guns before use to avoid the chances of
dirt being brought inside the bearing. Make sure the fitting is free of dirt before locking
the coupler to the zerk, and do not combine old grease with new grease.
2. What do I do if my grease fitting won’t take grease?
Inspect the following if the grease fitting won’t take grease: If the fitting nipple is
damaged, replace the fitting. But if the fitting is not damaged, it is obscured by debris that
prevents the flow, and you should replace the fitting. If there seems to be no damage,
then use an impact fitting cleaner to break down the clogs with compressed fluid
chemically.
3. How to remove the grease gun from zerk fitting?
Make sure to release the pressure on the fitting by tilting the coupler at an angle to break
the seal or loosening it with a wrench. Besides, after releasing the pressure, remember to
twist the coupler back and forth.
4. How to attach a grease gun to a zerk fitting?
First, make sure that the grease gun and the zerk are dirt-free before fastening the nozzle
to the fitting. Then, angle the coupler to the fitting and press down. Secure the connection
by tightening the nozzle on the fitting, and when the coupler clicks into place, start up the
grease gun, and let the lubricant flow.

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6. To sum up
Grease fittings offer us an easier way to keep machinery in good condition. However, we
should also do our due diligence in finding the best ones for our needs. Therefore, you
need to keep in mind the type of thread you need, your options, and correct their
application.
We hope that this article has aided you through the grease fitting identification and
selectionprocess and finding the perfect grease fitting for your task! If you have any
questions, leave us a comment now!

A-Z Guide To Grease Fitting Types, Sizes & Thread Identification

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A-Z Guide To Grease Fitting Types, Sizes & Thread Identification