TORQUE LIMITS - TM-9-4120-423-14-P0591

TM9-4120-423-14&P

TORQUE LIMITS

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INTRODUCTION

Scope

This work package contains the torque standards for specific types and sizes of hardware. It defines the

different types of bolts by grade.

TORQUE TABLES

How To Use Torque Tables

Measure the diameter of the screw you are installing.

Count the number of threads per inch or use a pitch grade.

Under the heading SIZE, look down the left-hand column until you find the diameter of the

screw you are installing. (There will usually be two lines beginning with the same size.)

In the second column under SIZE, find the numbers of threads per inch that matches the number

of threads you counted in step 2. (Not required for metric screws.)

NOTE

Manufacturer's marks may vary. Standard are all SAE Grade 5 (3-line). Metric screws

are of three grades: 8.8, 10.9, and 12.9. Grades and manufacturer's marks appear on the

screw head.

To find the grade screw you are installing, match the markings on the head to the correct picture

of CAPSCREW HEAD MARKINGS in the illustration preceding the torque table.

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