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Threaded Fasteners Chapter  11
TOPICS Introduction Thread  terminology Thread drawing and dimensioning Threaded  fastener
Introduction
FASTENING  TYPE 1. Permanent Welding Gluing Riveting
FASTENING  TYPE 2.1  Threaded fastener   - bolts  - studs  - screws 2. Temporary 2.2  Non-threaded fastener   - keys - pin key
THREAD  APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Part A Part B Part C
THREAD  APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Wood working vise Palm fruit pressing machine
Thread  Terminology
External (male) thread Internal (female) thread THREAD  TERMINOLOGY A thread cut on the  outside   of a cylindrical body. A thread cut on the  inside   of a cylindrical body. Internal thread External thread
Right-hand thread Thread that will  assemble  when turned  clockwise . Left-hand thread Thread that will  assemble  when turned  counter-clockwise . THREAD  TERMINOLOGY Turnbuckle  use RH and LH thread at each end to double displacement.
Crest Root Thread angle THREAD  TERMINOLOGY The  peak edge  of a thread. The  bottom  of the thread cut into a cylindrical body. The angle between threads faces. Internal Thread External Thread Crest Root Thread  angle Crest Root
Major diameter The  largest diameter  on an internal or external thread. Minor diameter The  smallest diameter  on an internal or external thread. Internal Thread External Thread THREAD  TERMINOLOGY Minor dia. Major dia. Minor dia. Major dia.
Pitch The distance between crests of threads. Lead The distance a screw will advance when turned 360 o . THREAD  TERMINOLOGY Internal Thread External Thread Pitch Pitch
Form is the profile shape of the thread. Thread  Form THREAD  TERMINOLOGY Example  : “ knuckle thread form”
EXTERNAL THREAD CUTTING ,[object Object],[object Object],Tools Operation
[object Object],[object Object],[object Object],INTERNAL THREAD CUTTING Tools Operation
COMPARISON  OF  THREAD  CUTTING Major Dia. Minor Dia. External Thread Internal Thread
Thread Drawing
1.  Detailed  representation 2.  Schematic  representation 3.  Simplified  representation THREAD  REPRESENTATION
External  thread Internal  thread DETAILED   REPRESENTATION Thread runout 60 o Pitch Use  slanting lines  to represent crest and root. Roots and crest are drawn in  sharp  Vs.
SCHEMATIC   REPRESENTATION External  thread Internal  thread Pitch Crest (thin line) Root (thick line) Use alternate  long  and  short   lines for representing crests  and  roots  of the thread, respectively.
SIMPLIFIED   REPRESENTATION External  thread Internal  thread Thread runout Use  thick continuous lines  for representing  crest and  thin continuous lines  for representing  root   of the thread, respectively. Pitch/2 Root Crest
SIMPLIFIED   REPRESENTATION External  thread Internal  thread Sectional view Use  thick continuous lines  for representing  crest and  thin continuous lines  for representing  root   of the thread, respectively.
ISO (METRIC) THREAD External thread Internal thread Center of  thread assembly Thread assemble occurs if and only if  both (internal & external) thread have an equal  nominal size ( or diameter )  and  pitch . 60 o Pitch, P P/4 P/8
METRIC  COARSE  THREAD Minor  diameter =  Major  diameter – Pitch Minor diameter ≈ Tap drill size [Table 9.1] Metric  thread In thread  drawing , the following relationship is used. 10.00 10.11 1.75 12.00 M12 8.50 8.38 1.50 10.00 M10 6.75 6.65 1.25 8.00 M8 5.00 4.92 1.00 6.00 M6 Tap drill size Minor diameter Pitch Major diameter Nominal size
METRIC  FINE  THREAD [Table 9.2] Minor  diameter =  Major  diameter – Pitch Minor diameter ≈ Tap drill size In thread  drawing , the following relationship is used. 9.00 8.917 1.00 9.25 9.188 0.75 10.00 M10 8.75 8.647 1.25 7.00 6.917 1.00 7.25 7.188 0.75 8.00 M8 Tap drill size Minor diameter Pitch Major diameter Nominal size
Thread Length DRAWING  STEPS  OF EXTERNAL  THREAD Starting position Draw thread axis Major dia. Minor dia. Draw 45 o  Chamfer Draw line making 30 o  with thread axis Draw a circle that represents a crest . Draw an arc that represents a root .
Internal Thread 1. Through threaded hole DRAWING  STEPS  OF THREADED  HOLE Draw thread axis Major dia. Minor dia. Draw a root Draw a crest Sectional view Draw a circle that represents a crest . Draw an arc that represents a root . root crest Section lines are drawn into the crest of a thread.
Minor dia. DRAWING  STEPS  OF THREADED  HOLE 2. Blinded threaded hole Draw thread axis Major dia. Hole depth Thread depth Draw a circle that represents a crest . Draw an arc that represents a root .
DRAWING  STEPS  OF THREADED  HOLE 2. Blinded threaded hole Sectional view
DIMENSIONING  EXTERNAL  THREAD M 10 ×1.5   ×1.0  Fine thread Coarse thread xx Thread length Use   local note   to specify :-  thread form ,  nominal size ,  pitch   (if it is a fine thread) Use   typical method   to specify :-  thread length .
3. Thread form 4. Nominal size 5. Pitch 1. Tap drill size 2. Drill depth 6. Thread depth 8.50 Drill, 20 Deep, M10 Tapped, 15 Deep DIMENSIONING  THREADED  HOLE Use   local note   to specify
Threaded Fastener
BOLT :  Terminology Bolt  is a threaded cylinder with a head.  Hexagonal head bolt and nut Dimensions of bolt’s head are listed in table 9.4. Head thickness Thread  length Length Width across flat
Draw bolt axis Draw an end view of the head B Starting position H Draw a bolt head B/2 B/2 30 o Length Thread Length Major   Draw  body of a bolt BOLT :  Drawing steps
NUT :  Drawing steps Draw an end view of the nut B H B/2 B/2 Dimensions of the nut are given in Table 9.14. Dash lines represent a threaded hole are omitted for clarity.
1. Insert a bolt into a   clearance hole 2. Insert a   washer . 3. Screw a   nut . BOLT :  Application
Let’ s think together… ,[object Object],(B) Use shorter bolt with the   same thread length . Correct (C) Reduce the thread length. Inappropriate Wrong (D) Add washer or nut. (A) Nothing have to be changed.
Let’ s think together… ,[object Object],[object Object],(B) Use a bolt of this length but   has a longer thread length. (C) Use a longer bolt with the   same thread length. (D) Add washer. (A) Nothing have to be changed. Correct Inappropriate Wrong
Let’ s think together… ,[object Object],[object Object],(B) Use a bolt of this length but   has a shorter thread length. (C) Use a longer bolt with the   same thread length. (D) Add washer. (A) Nothing have to be changed. Correct Inappropriate Wrong
Let’ s think together… ,[object Object],(A) Use a bolt of this length but   has a shorter thread length. (B) Use a longer bolt with the   same thread length. (C) Use a longer bolt by increasing a thread length (D) Remove washer. Correct Inappropriate Wrong
Let’ s think together… ,[object Object],[object Object],(A) Increase the bolt diameter. (B) Use washer with larger   outside diameter. (C) Reduce the hole diameter. (D) Add washer at bolt head. Correct Inappropriate Wrong
Let’ s think together… ,[object Object],[object Object],(B) Use a bolt with shorter   thread length. (C) Add washer. (D) Increase drill and thread   depths. (A) Nothing have to be changed. Correct Inappropriate Wrong
Let’ s think together… ,[object Object],[object Object],(A) Nothing have to be changed. (B) Use a bolt with slightly   longer thread length. Correct Inappropriate Wrong
Stud  is a  headless  bolt, threaded at both ends. STUD :  Terminology Thread  length Length Thread  length Drawing representation
Major   STUD :  Drawing steps Draw stud axis Minor   Starting position Stud  Length Thread Length Thread Length Draw 45 o  Chamfer Draw 45 o  Chamfer Draw line making 30 o  with axis
STUD :  Application 1. Drill a hole. 3. Screw a stud. 4. Place the part to be   fastened. 5. Insert washer and fastened a nut. 2. Tap a hole.
Let’ s think together… ,[object Object]
Let’ s think together… ,[object Object]
Cap screw  is similar to bolt, but has a longer thread than a bolt. CAP  SCREW :  Terminology
CAP  SCREW :  Counterbore  hole x drill,   y C’bore, z deep x  drill, w  deep,   y  C’bore, z  deep z
x drill, CSK to   y CAP  SCREW :  Countersink  hole x  drill,  w  deep, CSK to   y y Draw 90 o
SET  SCREW :  Terminology Set screw  is a  threaded cylinder used to prevent rotation or movement between parts.
SET  SCREW :  Application

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Engineering Drawing: Chapter 11 thread fastener

  • 2. TOPICS Introduction Thread terminology Thread drawing and dimensioning Threaded fastener
  • 4. FASTENING TYPE 1. Permanent Welding Gluing Riveting
  • 5. FASTENING TYPE 2.1 Threaded fastener - bolts - studs - screws 2. Temporary 2.2 Non-threaded fastener - keys - pin key
  • 6. THREAD APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Part A Part B Part C
  • 7. THREAD APPLICATION 1. To hold parts together. 2. To move part(s) relative to others. Wood working vise Palm fruit pressing machine
  • 9. External (male) thread Internal (female) thread THREAD TERMINOLOGY A thread cut on the outside of a cylindrical body. A thread cut on the inside of a cylindrical body. Internal thread External thread
  • 10. Right-hand thread Thread that will assemble when turned clockwise . Left-hand thread Thread that will assemble when turned counter-clockwise . THREAD TERMINOLOGY Turnbuckle use RH and LH thread at each end to double displacement.
  • 11. Crest Root Thread angle THREAD TERMINOLOGY The peak edge of a thread. The bottom of the thread cut into a cylindrical body. The angle between threads faces. Internal Thread External Thread Crest Root Thread angle Crest Root
  • 12. Major diameter The largest diameter on an internal or external thread. Minor diameter The smallest diameter on an internal or external thread. Internal Thread External Thread THREAD TERMINOLOGY Minor dia. Major dia. Minor dia. Major dia.
  • 13. Pitch The distance between crests of threads. Lead The distance a screw will advance when turned 360 o . THREAD TERMINOLOGY Internal Thread External Thread Pitch Pitch
  • 14. Form is the profile shape of the thread. Thread Form THREAD TERMINOLOGY Example : “ knuckle thread form”
  • 15.
  • 16.
  • 17. COMPARISON OF THREAD CUTTING Major Dia. Minor Dia. External Thread Internal Thread
  • 19. 1. Detailed representation 2. Schematic representation 3. Simplified representation THREAD REPRESENTATION
  • 20. External thread Internal thread DETAILED REPRESENTATION Thread runout 60 o Pitch Use slanting lines to represent crest and root. Roots and crest are drawn in sharp Vs.
  • 21. SCHEMATIC REPRESENTATION External thread Internal thread Pitch Crest (thin line) Root (thick line) Use alternate long and short lines for representing crests and roots of the thread, respectively.
  • 22. SIMPLIFIED REPRESENTATION External thread Internal thread Thread runout Use thick continuous lines for representing crest and thin continuous lines for representing root of the thread, respectively. Pitch/2 Root Crest
  • 23. SIMPLIFIED REPRESENTATION External thread Internal thread Sectional view Use thick continuous lines for representing crest and thin continuous lines for representing root of the thread, respectively.
  • 24. ISO (METRIC) THREAD External thread Internal thread Center of thread assembly Thread assemble occurs if and only if both (internal & external) thread have an equal nominal size ( or diameter ) and pitch . 60 o Pitch, P P/4 P/8
  • 25. METRIC COARSE THREAD Minor diameter = Major diameter – Pitch Minor diameter ≈ Tap drill size [Table 9.1] Metric thread In thread drawing , the following relationship is used. 10.00 10.11 1.75 12.00 M12 8.50 8.38 1.50 10.00 M10 6.75 6.65 1.25 8.00 M8 5.00 4.92 1.00 6.00 M6 Tap drill size Minor diameter Pitch Major diameter Nominal size
  • 26. METRIC FINE THREAD [Table 9.2] Minor diameter = Major diameter – Pitch Minor diameter ≈ Tap drill size In thread drawing , the following relationship is used. 9.00 8.917 1.00 9.25 9.188 0.75 10.00 M10 8.75 8.647 1.25 7.00 6.917 1.00 7.25 7.188 0.75 8.00 M8 Tap drill size Minor diameter Pitch Major diameter Nominal size
  • 27. Thread Length DRAWING STEPS OF EXTERNAL THREAD Starting position Draw thread axis Major dia. Minor dia. Draw 45 o Chamfer Draw line making 30 o with thread axis Draw a circle that represents a crest . Draw an arc that represents a root .
  • 28. Internal Thread 1. Through threaded hole DRAWING STEPS OF THREADED HOLE Draw thread axis Major dia. Minor dia. Draw a root Draw a crest Sectional view Draw a circle that represents a crest . Draw an arc that represents a root . root crest Section lines are drawn into the crest of a thread.
  • 29. Minor dia. DRAWING STEPS OF THREADED HOLE 2. Blinded threaded hole Draw thread axis Major dia. Hole depth Thread depth Draw a circle that represents a crest . Draw an arc that represents a root .
  • 30. DRAWING STEPS OF THREADED HOLE 2. Blinded threaded hole Sectional view
  • 31. DIMENSIONING EXTERNAL THREAD M 10 ×1.5 ×1.0 Fine thread Coarse thread xx Thread length Use local note to specify :- thread form , nominal size , pitch (if it is a fine thread) Use typical method to specify :- thread length .
  • 32. 3. Thread form 4. Nominal size 5. Pitch 1. Tap drill size 2. Drill depth 6. Thread depth 8.50 Drill, 20 Deep, M10 Tapped, 15 Deep DIMENSIONING THREADED HOLE Use local note to specify
  • 34. BOLT : Terminology Bolt is a threaded cylinder with a head. Hexagonal head bolt and nut Dimensions of bolt’s head are listed in table 9.4. Head thickness Thread length Length Width across flat
  • 35. Draw bolt axis Draw an end view of the head B Starting position H Draw a bolt head B/2 B/2 30 o Length Thread Length Major  Draw body of a bolt BOLT : Drawing steps
  • 36. NUT : Drawing steps Draw an end view of the nut B H B/2 B/2 Dimensions of the nut are given in Table 9.14. Dash lines represent a threaded hole are omitted for clarity.
  • 37. 1. Insert a bolt into a clearance hole 2. Insert a washer . 3. Screw a nut . BOLT : Application
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45. Stud is a headless bolt, threaded at both ends. STUD : Terminology Thread length Length Thread length Drawing representation
  • 46. Major  STUD : Drawing steps Draw stud axis Minor  Starting position Stud Length Thread Length Thread Length Draw 45 o Chamfer Draw 45 o Chamfer Draw line making 30 o with axis
  • 47. STUD : Application 1. Drill a hole. 3. Screw a stud. 4. Place the part to be fastened. 5. Insert washer and fastened a nut. 2. Tap a hole.
  • 48.
  • 49.
  • 50. Cap screw is similar to bolt, but has a longer thread than a bolt. CAP SCREW : Terminology
  • 51. CAP SCREW : Counterbore hole x drill,   y C’bore, z deep x drill, w deep,   y C’bore, z deep z
  • 52. x drill, CSK to  y CAP SCREW : Countersink hole x drill, w deep, CSK to  y y Draw 90 o
  • 53. SET SCREW : Terminology Set screw is a threaded cylinder used to prevent rotation or movement between parts.
  • 54. SET SCREW : Application