Fastener Thread Diameters and Installation Torques

February 13, 2017

Minimum (minor) and maximum (major)  thread diameters, threads per inch, tap size and drill sizes. ANSI External screw thread dimensions. Installation torque values from two different sources.

The data fastener thread pitch and diameter data below is taken, in part from,  from  MIL-S-8879

External screw thread dimensions from ANSI standard:

Bolt installation torques are taken from (NASA-RP-1228, 1990), (FAA-8083-30, 2008) and (MIL-HDBK-60, 1990)

The following chart is taken from (MIL-HDBK-60, 1990)

This table of recommended torque values is taken from (FAA-8083-30, 2008) chapter 5

There is a spreadsheet available with this data here

You can browse all of our spreadsheets here


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