TM-9-2320-272-23-5
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-5 - Page 441 of 623
GENERAL - Continued
4.
In the second column under SIZE, find the number of threads per inch that matches the number of threads
you counted in Step (2).
5.
To find the grade screw you are installing, match the markings on the head to the correct picture of
CAPSCREW HEAD MARKINGS on the torque table.
CAPSCREW HEAD MARKINGS
STANDARD
M10018DAA
METRIC
M9863DAA
Manufacture's marks may vary. These are all SAE
Grade 5 (3-line).
Metric screws are of three grades: 8.8, 10.9, and
12.9. Grades and Manufacture's marks appear on
the screw head.
6.
Look down the column under the picture you found in Step (5) until you find the torque limit (in lb-ft or N·m)
for the diameter and threads per inch of the screw.
TORQUE WRENCH ADAPTERS
Some tasks require the use of a torque wrench adapter when the nut or screw cannot be reached with a regular
socket on the end of the torque wrench. These adapters add to the overall length of the torque wrench and make
the dial or scale reading less than the actual torque applied to the nut or screw. To prevent overtorquing and damage
to equipment, calculate correct dial or scale reading using Conversion Formula.
CONVERSION FORMULA
Corrected dial or scale readings are determined by the use of the following formula:
TM 9-2320-272-23-5
0821
0821-2
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