March 28, 2014
1
Prepared By:
Adnan Aslam
G.C.T FaislabadMarch 28, 2014 2
Thread
Helical ridge of uniform section formed on inside or
outside of cylinder or cone
Used for several purposes:
Fas...
March 28, 2014 4
Major Dia.
Minor Dia.
Pitch Dia.
Pitch
Lead
Thread Angle
Root
Crest
Helix Angle
March 28, 2014 5
Major Diameter
Commonly known as the outside diameter .
On a screw thread, the major diameter is the
larg...
March 28, 2014 6
Minor Diameter
Called the root diameter, the minor diameter is
the smallest diameter of the thread on the...
Pitch diameter
Diameter of imaginary cylinder that passes through
thread at point where groove and thread widths are
equ...
March 28, 2014 8
Number of Threads
The number of threads per inch.
Pitch
The distance from a given point on one
thread to a corresponding point on the very
next thread
March 28, 2014 9
Lead
The distance a screw thread advances in one
revolution.
The lead and the pitch of a single lead thread are
the same....
March 28, 2014 11
Single Lead Double Lead
Root
Bottom surface joining sides of two adjacent
threads
External thread on minor diameter
Internal thread on major di...
Crest
Top surface joining two sides of thread
External thread on major diameter
Internal thread on minor diameter
March...
Flank
Thread surface that connects crest with root
March 28, 2014 14
Depth of thread
Distance between crest and root measured
perpendicular to axis
March 28, 2014 15
Angle of thread
Included angle between sides of thread
measured in axial plane
March 28, 2014 16
March 28, 2014
CH-8 LEC 33 Slide 17
Helix angle
Angle that thread makes with plane perpendicular to
thread axis
March 28, 2014 18
Right-hand thread
Helical ridge of uniform cross section onto
which nut is threaded in clockwise direction
When cut on l...
March 28, 2014 20
Left-hand thread
• Helical ridge of uniform cross section onto
which nut is threaded in counterclockwise...
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Threads

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All Key points that use in thread making & designing.
Mian Adnan Aslam From Sheikhupura, Pakistan...

Published in: Engineering
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Threads

  1. 1. March 28, 2014 1
  2. 2. Prepared By: Adnan Aslam G.C.T FaislabadMarch 28, 2014 2
  3. 3. Thread Helical ridge of uniform section formed on inside or outside of cylinder or cone Used for several purposes: Fasten devices such as screws, bolts, studs, and nuts Provide accurate measurement, as in micrometer Transmit motion Increase force March 28, 2014 3
  4. 4. March 28, 2014 4 Major Dia. Minor Dia. Pitch Dia. Pitch Lead Thread Angle Root Crest Helix Angle
  5. 5. March 28, 2014 5 Major Diameter Commonly known as the outside diameter . On a screw thread, the major diameter is the largest diameter of the thread on the screw or nut.
  6. 6. March 28, 2014 6 Minor Diameter Called the root diameter, the minor diameter is the smallest diameter of the thread on the screw or nut.
  7. 7. Pitch diameter Diameter of imaginary cylinder that passes through thread at point where groove and thread widths are equal Equal to major diameter minus single depth of thread Tolerance and allowances given at pitch diameter line March 28, 2014 7
  8. 8. March 28, 2014 8 Number of Threads The number of threads per inch.
  9. 9. Pitch The distance from a given point on one thread to a corresponding point on the very next thread March 28, 2014 9
  10. 10. Lead The distance a screw thread advances in one revolution. The lead and the pitch of a single lead thread are the same. On double lead threads, the lead is twice the pitch. A double lead thread has two start points. March 28, 2014 10
  11. 11. March 28, 2014 11 Single Lead Double Lead
  12. 12. Root Bottom surface joining sides of two adjacent threads External thread on minor diameter Internal thread on major diameter March 28, 2014 12
  13. 13. Crest Top surface joining two sides of thread External thread on major diameter Internal thread on minor diameter March 28, 2014 13
  14. 14. Flank Thread surface that connects crest with root March 28, 2014 14
  15. 15. Depth of thread Distance between crest and root measured perpendicular to axis March 28, 2014 15
  16. 16. Angle of thread Included angle between sides of thread measured in axial plane March 28, 2014 16
  17. 17. March 28, 2014 CH-8 LEC 33 Slide 17
  18. 18. Helix angle Angle that thread makes with plane perpendicular to thread axis March 28, 2014 18
  19. 19. Right-hand thread Helical ridge of uniform cross section onto which nut is threaded in clockwise direction When cut on lathe, toolbit advanced from right to left March 28, 2014 19
  20. 20. March 28, 2014 20 Left-hand thread • Helical ridge of uniform cross section onto which nut is threaded in counterclockwise direction • When cut on lathe, toolbit advanced from left to right

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