TM 5-2330-325-14&P
H-5.
TIGHTENING METAL FASTENERS (Continued)
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)
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 H-4), 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.
