Specifications

C–1Torque Table
C Torque Table
IMPORTANT
Torque values specified in replacement procedures (Chapter 5) take
precedence over Table C–1.
Table C–1 establishes the torque requirements for routine installation of
threaded fasteners. The torque requirements in Table C–2 apply to fasteners
made of steel, at a minimum engagement of 3.5 threads, including chamfer
and countersink. Fastener sizes are listed as Numbered Size – Threads Per
Inch.
Table C–1. Torque Table
Fastener
Size
Into Alum.
or Brass
25 000 psi
ultimate
tensile
strength
Into
Weld/Press
Studs or
Nuts
Into Medium
Carbon Steel
Fasteners
105,000 psi
ultimate tensile
strength
Into Steel
60 000 psi
ultimate
tensile
strength
Carbon Steel Fasteners
(ANSI B18.6.3 – 1972)
2–56
4–40
6–32
8–32
10–24
10–32
1/4 – 20
25 ± 2 in oz
62 ± 4 in oz
122 ± 7 in oz
11 ± 1 in lb
20 ± 1 in lb
15 ± 1 in lb
40 ± 3 in lb
36 ± 2 in oz
75 ± 5 in oz
150 ± 10 in oz
18 ± 1 in lb
25 ± 1.5 in lb
29 ± 2 in lb
62 ± 4 in lb
30 ± 2 in oz
70 ± 5 in oz
135 ± 10 in oz
18 ± 1 in lb
21 ± 1 in lb
29 ± 1 in lb
62 ± 4 in lb
––
––
105 ± 5 in lb
––
––
––
––
Fastener Size
Torque for Routine Tightening of Threaded
Fasteners
4–40 UNC & 4–48 UNF
4 ± 1 in lb
6–32 UNC & 6–40 UNF
11 ± 1 in lb
8–32 UNC & 8–36 UNF
19 ± 1 in lb
10–24 UNC & 10–32 UNF
25 ± 1 in lb