This document provides information for grading the condition of drill bits using a standardized system with codes for various elements: 1. The cutting structure condition is graded on a scale of 0-8, with 0 being no loss/wear and 8 being total loss/wear, for both inner and outer cutting structures. 2. Dull characteristics are identified with codes like BT for broken teeth. 3. Location codes identify where on the bit the dull characteristic is found, such as the nose row. 4. Bearing/seal condition is also graded on a 0-8 scale or identified as effective/failed. Gauge wear is measured in 1/16 inch increments. 5. The final

1. 1
2
Inner cutting structure
(all inner rows)
Outer cutting structure
(gauge row only)
In columns 1 and 2, a linear scale from
0 to 8 is used to describe the condition
of the cutting structure according to the
following:
Steel tooth bits
A measure of lost tool height resulting
from abrasion and/or damage.
0 – No loss of tooth height.
8 – Total loss of tooth height.
Insert bits
A measure of total cutting structure
reduction resulting from lost, worn and/or
broken inserts.
0 – No lost, worn and/or broken inserts.
8 – All inserts lost, worn and/or broken.
Fixed cutter bits
A measure of lost, worn and/or broken
cutting structure.
0 – No lost, worn and/or cutting structure.
8 – All of cutting structure Lost, worn
and/or broken.
3 Dull characteristics
(Use only cutting structure related codes.)
BC – broken cone
BF – bond failure
BT – broken teeth/cutters
BU – balled up bit
CC – cracked cone
CD – cone dragged
CI – cone Interference
CR – cored
CT – chipped teeth/cutters
ER – erosion
FC – flat crested wear
HC – heat checking
JD – junk damage
LC – lost cone
LN – lost nozzle
LT – lost teeth/cutters
OC – off-center wear
PB – pinched bit
PN – plugged nozzle/flow passage
RG – rounded gauge
RO – ring out
SD – shirttail damage
SS – self-sharpening wear
TR – tracking
WO – washed out bit
WT – worn teeth/cutters
NO – no dull characteristic
† Show Cone number or numbers under
location
4
5
6
Location
Roller cone
N – nose row Cone no.
M – middle row 1
G – gauge row 2
A – all rows 3
Fixed cutter
C – cone S – shoulder
N – nose G – gauge
T – taper A – all areas
Bearings/seals
Non-sealed bearings
A linear scale estimating bearing life
used. (0 – No life used, 8 – All life used,
i.e., no bearing life remaining.)
Sealed bearings
E – seals effective
F – seals failed
N – not able to grade
X – fixed cutter bit (bearingless)
Gauge measure in 1⁄16 of an inch.
I – In gauge
1⁄16–1⁄16 in. out of gauge
2⁄16–1⁄8 in. out of gauge
4⁄16–1⁄4 in. out of gauge
7
8
Other dull characteristic
Refer to column three codes.
Reason pulled or run terminated
BHA – change bottomhole assembly
DMF – downhole motor failure
DTF – downhole tool failure
DSF – downhole string failure
DST – drill stem test
LOG – run logs
LIH – left in hole
RIG – rig repair
CM – condition mud
CP – core point
DP – drill plug
FM – formation change
HP – hole problems
HR – hours on bit
PP – pump pressure
PR – penetration rate
TD – total depth/casing depth
TQ – torque
TW – twist off
WC – weather conditions
Note: Bits shown are based on individual manufacturer’s published availability data. Comparisons may differ in particular drilling areas. Your ReedHycalog representative can provide specific data for your needs.
Series
Formations
Type
Features
1 Standard Roller 4 Sealed Bearing 5 Sealed Roller Bearing and Gauge Protection 6 Friction Bearing 7 Sealed Friction Bearing and Gauge Protection
Reed
Hycalog
Hughes
Smith
Security
Reed
Hycalog
Hughes
Smith
Security
Reed
Hycalog
Hughes
Smith
Security
Reed
Hycalog
Hughes
Smith
Security
Reed
Hycalog
Hughes
Smith
Security
Milled
Tooth
Bit
1 Soft formations
with low compression
strength and high
drillability
1 Y11 R1 DSJ XN1
S3SJ
GTX-1 SDS T11, EMS11G
ETS11G
GTX-G1
MAX-GTI
MX-1, MXL-1
MSDSH
MSDSSH
XR+, SDSH
XT1S
XL1N
EBXT1
HP11
EHT11
FDS
FDSS+
TC10, TC11,
RT1, HP11,
SL11, TD11, D11
GT1, XLX1, STX1,
STR1, MX1, MXL1
GT-G1H, GT-G1
XR+
FDS+
XS1 EBXS1
EBXL1
2 HP12 FDT SL12
3 Y13 R3 DGJ XN3 GTX-3 T13, EMS13G
ETS13G
GTX-G3
MAX-GT3, MX-3
MSDGH,
MGGH+, GGH+
EBXT3 HP13 FDG D13, HP13G MX-3 FDGH
MFDGH
XS3, XL3
2 Medium to medium-hard
formations with high
compressive strength
1 XN4 SVH, MSVH XT4 ATJ-4 FV HP21G ATJ-G4 FVH XS4, XL4
2 DR5 OFM
3 Hard semi-abrasive or
abrasive formations
1 XN5
2 R7 OFH
4 ATJ-G8
Tooth Bit Comparison Chart
Cutting Structure Bearings/Seals Gauge Other Dull Characteristics Reason Pulled
Inner Outer Dull Characteristics Location
1 2 3 4 5 6 7 8
IADC
Dull
Bit
Grading
Nozzle
Size
(in. [mm])
Nozzle
Number
Flow Area of
One Nozzle
(in2
[mm2
])
Flow Area of
Two Nozzles
(in2
[mm2
])
Flow Area of
Three Nozzles
(in2
[mm2
])
Flow Area of Four
Nozzles
(in2
[mm2
])
7⁄32 [5.5] 7 0.0376 [24.3] 0.0752 [48.5] 0.1127 [72.9] 0.1503 [97.0]
1⁄4 [6.4] 8 0.0491 [31.7] 0.0982 [63.4] 0.1473 [95.0] 0.1963 [126.1]
9⁄32 [7.1] 9 0.0621 [40.1] 0.1242 [80.1] 0.1864 [120.2] 0.2485 [160.3]
5⁄16 [7.9] 10 0.0767 [49.5] 0.1534 [99.0] 0.2301 [148.4] 0.3068 [197.9]
11⁄32 [8.7] 11 0.0928 [59.5] 0.1856 [119.7] 0.2784 [179.6] 0.3712 [239.5]
3⁄8 [9.5] 12 0.1104 [71.2] 0.2209 [142.5] 0.3313 [213.7] 0.4418 [285.0]
13⁄32 [10.3] 13 0.1296 [83.6] 0.2592 [167.2] 0.3889 [250.9] 0.5185 [334.5]
7⁄16 [11.1] 14 0.1503 [97.0] 0.3007 [194.0] 0.4510 [291.0] 0.6013 [388.0]
15⁄32 [11.9] 15 0.1726 [111.4] 0.3451 [222.8] 0.5177 [334.2] 0.6903 [445.4]
1⁄2 [12.7] 16 0.1963 [126.6] 0.3927 [253.2] 0.5890 [379.8] 0.7854 [506.7]
9⁄16 [14.3] 18 0.2485 [160.3] 0.4970 [320.6] 0.7455 [481.0] 0.9940 [641.3]
5⁄8 [15.9] 20 0.3068 [197.9] 0.6136 [395.9] 0.9204 [593.8] 1.2272 [791.8]
11⁄16 [17.5] 22 0.3712 [239.5] 0.7424 [479.0] 1.1137 [718.5] 1.4849 [958.1]
3⁄4 [19.0] 24 0.4418 [285.0] 0.8836 [570.1] 1.3254 [855.0] 1.7672 [1140.2]
7⁄8 [22.2] 28 0.6013 [387.9] 1.2026 [775.9] 1.8040 [1163.7] 2.4053 [1551.9]
Jet
Nozzle
Flow
Areas
Bit Size (in. [mm]) API Pin Size (in. [mm]) Recommended Torque (lbt-ft [Newton])
3 3
⁄4 – 4 1
⁄2 [95.2–114.3] 2 3
⁄8 [60.3] 3,000–3,500 [4,000–4,800]
4 5
⁄8 – 5 [117.5–127.0] 2 7
⁄8 [73.0] 6,000–7,000 [8,000–9,500]
5 1
⁄8 – 7 3
⁄8 [136.5–187.3] 3 1
⁄2 [88.9 7,000–9,000 [9,500–12,000]
7 5
⁄8 – 9 [193.7–228.6] 4 1
⁄2 [114.3] 12,000–16,000 [16,000–22,000]
9 1
⁄2 – 26 [241.3–660.4] 6 5
⁄8 [168.3] 28,000–32,000 [38,000–43,000]
14 3
⁄4 – 26 [374.6–660.4] 7 5
⁄8 [193.7] 34,000–40,000 [46,000–54,000]
Recommended
Roller Cone
Makeup
Torque
Revision Date: 12/13/06

2. Series
Formations
Type
Features
5 Sealed Roller Bearing and Gauge Protection 7 Sealed Friction Bearing and Gauge Protection
ReedHycalog Hughes Smith Security ReedHycalog Hughes Smith Security
Tungsten
Carbide
Insert
Bits
4 Soft
formations
with low
compressive
strength
and high
drillability
1 T41, EMS41H GTX, MAXGT, MXL - 00
GTX, MAXGT, MXL - 03
GS01, G02, GS03B,
GS04B, G04
XT 00–05 R01A, TD41A, R03A , TD41H, TD41 GT, GX, MX, MXL - 00
GT, GX, H, HX, STR, MX, MXL-03, HX-03C
GFS01, GFS04 XS, XL 00–05
2 T42, EMS42H GTX-03C, GTX, MX-09H, MX,
MXL - 09, GTX-11, MX-11S
GS05, GS05B,
GS08
XT 06–09 R07A, TD42H STR-05C, HX-05C GF05, GF05B, GFS05, F05, MF05 XS, XL 06–09
3 T43, EMS43A
EMS43H
GTX, MAXGT, MX,
MXL - 09, GTX-11H, MX-11
G10, GS10,
GS10B
XT 10-13 R09A, TD43A, HP43A; R12A, TD43H,
SL43H, HP43H; RD12, D43
GT, GX, H, HX, STR, STX, MX, MXL - 09, 09C, 09G,
09H; GX, MX, MXL - 11, 11C, 11H, 11S
F10, F10B, F12, F12Y, GF08B,
GF10B, GF10HB, GFS10B, GF12T, XR10T
XS, XL 10–13
4 T44, EMS44H
EMS44A
MAXGT-18, MX-18 G15, G18, GS18,
GS18B, 15JS
XT 14–17 R14A, TD44A, HP44X; R14, R15, TD44;
R15A, TD44H, HP44H; RD15, D44
GT, GX, H, HX, STR, STX, MX, MXL - 18, 18C, 18H FH16, FH18, MF15T, XR15, XR15T, FG15,
GF15B, GFS15, GFS15B
XS, XL 14–17
5 Soft to
medium
formations
with high
compressive
strength
1 T51, EMS51A
EMS51H
GTX, MAXGT,
MX - 20, 20G, 20H,
MXL - 20, GTX, MX-22
G20, GS20B,
G25, 2JS
XT 18–23 R19A; R20A, TD51A, HP51A;
R21A, TD51X, HP51X; RD21, D51;
R22A, TD51H, SL51H, HP51H
GT, GX, H, HX, STR, STX, MX, MXL - 20, 20G, 20H,
20S, 22, 23, 25
FH20, FH22, FH23, MF20T, MFS20T, XR20T,
MFS20T, XR20T, XR25,
GF20, GFS20B
XS, XL 18–23
2 T52, EMS52H GTX, MX - 20C
MAXGT, MX - 20CG
G26B XT 24–27 R24A, TD52A, TD52R; R25A, TD52X,TD52A;
RD25, D52; R26A, R27, TD52I, R28A
GT, GX, H, HX, STR, STX, MX, MXL - 20C, 20CH,
28, 28C
FH26, FH28, F27, F27I, F27IY, GF26, XR20Y,
F20Y, XR20TY
XS, XL 24–27
XL 46–51
3 T53, EMS53,
EMS53A, ETS53A
MX-30H, MAXGT-30
GTX-33, MX-33CG
G40, G40Y, XT 28–33 R30A, TD53A; R30, TD53; RD33, D53;
TD53H, HP53H, TD53B, JA53
GT, GX, H, HX, STR, STX, MX, MXL - 30, 30G, 30H,
35HX-30, MX-30
FH30, FH32, F30T, FS30T, MF30T,
XR30, XR32, GF30B, GFS30B
XS, XL 28–33
4 T54 GTX-30C, MAXGT-30CG XT 34–39 R34A, TD54A
R35A
R36A, TD54X, TD54
GT, GX, H, HR, HX, STR, STX, MX, MXL - 30C,
30CG, 35C, 35CG, 38C, 38CH, STX-30C, H-30C,
HR-38C, HR-30C, HR-35, MX-35C
FH35, F37, F37Y, F37HY, MF37,
XR30TY, XR30Y, XR30YA
XS, XL 34–39
6 Medium-hard
formations
with high
compressive
strength
1 ETS61A G40, G40Y,
G40HY, 4JS
XT 40–45 R40A, TD61A, SL61A, HP61A, TD61H;
R40, TD61, SL61
HR, STR, STX, GX, MX - 40, 40G, 44, 44G FH40, FH45, F40, GF40H, GF40YB, XR38,
XR40, F47A, F47Y, GF47Y
XS, XL 40–45
2 EMS62 GTX-40C, MX-44C 5JS, 47JS XT 46–51 R44A, TD62A, SL62A, SL62X, HP62A;
R45, TD62, HP62, JA62
HR, STR, STX, GX, MX - 50, 50A, 50R, 50RG, 55,
55RG, 55R, 55H, 40CG, 44C, 44CH, 45C
FH43Y, FH50, F47H, F47HY, XR40Y, XR40YA,
XR50, F50, GF45Y
XS, XL 46–51
3 MX-55 M57 XT 52–59 R50, SL63, TD63, HP63 XL-50A; STR, STX, HR, MX - 50; HR, MX - 55 F57, F57Y, F50YA, XR50Y XS, XL 52–59
4 XT 61–69 R60, TD64, HP64; R65, TD64H, HP64H HR-60, HR-66, HR-68, STX60, MX66, MX68 F59Y, F59HY, F67Y, MF67Y, XR65Y XS 61–69
7 Hard
semi-abrasive
and abrasive
formations
3 XT 77–81 R73, TD73, SL73 STR-70, STX-70, HR-70 F68Y, XR68Y, XR68HY, XR70Y XS 77–81
4 IADC Code Example
HP53: IADC 537
5 = Series (soft to medium insert bit)
3 = Type
7 = Feature (journal bearing and gauge protection)
XT 83–89 R75, TD74, HP74 STX88, MX88 XS 83–89
8 Extremely
hard and
abrasive
formations
1 XT91, XT93 R80, TD81, HP81 HR-80, HR-88, HR-89 , STX-80, STR-80 F80Y, XR80Y XS91, XS93
2 XT95, XT97 F85Y XS95, XS97
3 XT99,
EBTX99
R85, R90, TD83, SL83, HP83
R95
HR, STX, STE - 90, HR, GX - 95, HR, STX, GX,
MX - 99
F90Y, XR90Y XS99
Insert Bit Comparison Chart
R – RockForceTM
premium journal bearing insert
TC – TuffCutterTM
premium tooth bit with journal bearing
T – TitanTM
Premium sealed roller bearing tooth & insert bit
RD – RockForce DirectionalTM
premium journal with directional
cutting structure enhancements
RT – RockForce premium journal bearing tooth
EMS – Motor Series bit with sealed roller bearing
ETS – Standard sealed roller bearing, tooth and insert
HP, SL, TD – Standard journal bearing tooth and insert
D – TuffDutyTM
Directional tooth and insert
JA – Journal bearing bit for air applications
Y – Nonsealed roller bearing tooth bit
A – Chisel shaped inserts
B, H, I, X, V – Cutting structure variants that may differ by bit type
M – MudPick IITM
Hydraulics, directed nozzles for faster ROP
G – Flush tungsten carbide heel pacs
F – Flame-sprayed tungsten carbide cone coating for erosion
resistance
Y – Crossflow hydraulics
P – Premium protruding insert shirttail protection (previously KPR)
C – Center jet
K – Standard flush insert shirttail protection (previously K or KP)
L – Welded steel lug pads with tungsten carbide inserts
Ex: R34AM (IADC 547, chisel inserts, MudPick II Hydraulics)
DA – Diamond all rows (100%)
DN – Diamond nose inserts (100%)
DI – Diamond inner rows (100%)
DG – Diamond gauge inserts (100%)
DH – Diamond heel row inserts (50%), alternating with carbide
DH2 – Diamond heel row inserts (100%)
DT – Diamond GageGuard™ Inserts (100%)
DP – Protruding diamond coated insert shirttail protection, mixed with carbide
DP2 – 100% Protruding Diamond coated insert shirttail protection
DK – Diamond K
DL – Diamond L pads
All features listed after D suffix are diamond.
Ex: R30PDGH2 (Carbide P protection, diamond gauge and 100% diamond heel inserts)
Bit
Prefi
x
Designations
Bit
Suffi
x
Designations
Diamond
Enhanced
Suffi
xes