Imperial & Metric Thread Pitch

IMPERIAL: Threads Per Inch
  METRIC: Pitch
Size UNC UN8 UNF BSW BSF   Size Coarse Fine
1/8" 40 - 44 40 -   M3 0.5 0.35
  32 - 36 - -   M4 0.7 0.5
3/16" 24 - 32 24 32   M5 0.8 0.5
1/4" 20 - 28 20 26   M6 1 0.75
5/16" 18 - 24 18 22   M8 1.25 1
3/8" 16 - 24 16 20   M10 1.5 1.25
1/2" 13 - 20 14 18   M12 1.75 1.5
9/16" 12 - 18 12 16   M14 2 1.5
5/8" 11 - 18 11 14   M16 2 1.5
  - - - - -   M18 2.5 1.5
3/4" 10 - 16 10 12   M20 2.5 1.5
7/8" 9 - 14 9 11   M22 2.5 1.5
1" 8 8 12 (14) 8 10   M24 3 2
1  1/8" 7 8 12 7 9   M27 3 2
1  1/4" 7 8 12 7 9   M30 3.5 2
1  3/8" 6 8 12 6 8   M33 3.5 2
1  1/2" 6 8 12 6 8   M36 4 3
1  5/8" - 8 - 5 8   M39 4 3
  - - - - -   M42 4.5 -
1  3/4" 5 8 - 5 7   M45 4.5 -
1  7/8"   8 - - -   M48 5 -
2" 4.5 8 - 4.5 7   M52 5 -
2  1/4" 4.5 8 - 4 6   M56 5.5 -
  - - - - -   M60 5.5 -
2  1/2" 1 8 - 4 6   M64 6 -
2  3/4" 4 8 - 3.5 6   M72 6 -
3" 4 8 - 3.5 5   M80 6 -
3  1/4" 4 8 - 3.25 5   M- - -
3  1/2" 4 8 - 3.25 4.5   M90 6 -
3  3/4" 4 8 - 3 4.5   M- - -
4" 4 8 - 3 4.5   M100 6 -

This thread table is for reference only to demonstrate similarities across imperial and metric systems, this dose not imply products are interchangeable.

Both systems are used across Australia and certain industries or applications will favour one over the other.  Our range of threaded fasteners is covered by the metric coarse thread standard unless indicated, metric fine can be requested upon application.

We carry a larger range of threaded rod in stock from common sizes M6 to M36 however we can also accomodate range of bar stock up to M100 and can roll threads apon request.

 

Stud Bolt Kits

Our stud bolt kits follow ASTM standard and dimensioning used by the pertrochemical industry. Our studbolt lengths measure first thread to first thread, this length is calculated between the chamfered ends. Ensuring the correct amount of lead threads are still visible once installed.