TM 9-2510-247-13&P
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5. TIGHTENING METAL FASTENERS - Continued
Table 7. Torque Ranges
STATED RANGE
MOST EFFECTIVE RANGE
0-600 lb-ft (0-813.60 Nm)
150-450 lb-ft (203.40-610.20 Nm)
0-170 lb-ft (0-230.52 Nm)
44-131 lb-ft (59.67-177.64 Nm)
15-75 lb-ft (61.02-101.70 Nm)
30-60 lb-ft (40.68-81.36 Nm)
6. FASTENER SIZE AND THREAD PATTERN
Threaded fasteners are categorized according to diameter of the fastener shank. Thread styles
are divided into broad groups, the two most common being coarse (Unified Coarse-UNC) and fine (Unified
Fine-UNF0. These groups are defined by the number of threads per inch on the bolt shanks. In addition,
threads are categorized by thread class (Table 8), which is a measure of the degree between threads of bolt or
screw (external threads) and threads of the attaching nut or tapped hole (internal threads of the attaching nut or
tapped hole) (internal threads). The most common thread class for bolts and screws is Class 2.
Table 8. Thread Classes and Description
LENGTH
(BOLT SHANK)
GRIP
BODY LENGTH
THICKNESS
HEIGHT
LENGTH
OR HEIGHT
OF NUT
OF HEAD
NOMINAL DIAMETER
THREAD
THREAD
LENGTH
RUNOUT
LENGTH
LENGTH
(BOLT SHANK)
GRIP
BODY LENGTH
THICKNESS
HEIGHT
LENGTH
OR HEIGHT
OF NUT
OF HEAD
NOMINAL DIAMETER
THREAD
THREAD
LENGTH
RUNOUT
LENGTH
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