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How to measure socket head shoulder screws

To specify inch shoulder screws:

  1. Call out shoulder diameter, then
  2. The shoulder length

Example: 5/8″ x 2″ = a shoulder screw with a 5/8″ diameter shoulder, 2″ long.

Thread size is one standard size smaller than the shoulder diameter and needn’t be specified, except for:

  • A screw with a 1/2″ diameter shoulder has a 3/8 – 16 thread.
  • A 5/8″ diameter shoulder has a 1/2 – 13 thread.

Why? 7/16″ and 9/16″ are not stocked shoulder diameter thread sizes.

To specify metric shoulder screws:

  1. Call out shoulder diameter, then
  2. The thread diameter, then
  3. The shoulder length

Example: 12/M10 x 30 = a shoulder screw with a 12mm shoulder diameter, a 10mm thread diameter and a 30mm shoulder length.

ISO 9001:2008 and AS9120 certified
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