TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 1159 of 1275

TM9-2350-311-20-1

F-1 TORQUE LIMITS

Table F-1 lists wet torque limits. Wet torque limits are used on screws that have high-pressure lubricants applied to

threads.

F-2 HOW TO USE TORQUE TABLE

1 Measure diameter of screw you are installing.

2 Count number of threads per in. or use a pitch gage.

3 Under heading ‘SIZE”, look down left column until you find diameter of screw being installed (there will usually

be two lines beginning with same size).

4 In second column under “SIZE”, find number of threads per in. that matches number of threads counted in step

2.

5 To find grade of screw being installed, match markings on head to correct picture of cap screw head markings

in torque table.

6 Look down column under picture found in step 5 until you find torque limit in Ib-ft or N·m for diameter and

threads per in. of screw being installed.

NOTE

Manufacturer’s cap screw head marking may vary. These are all SAE grade 5 (3 line).

F-2