Specifications

D–1Torque Table
D Torque Table
Table C–1 establishes the torque requirements for routine installation of
threaded fasteners. These requirements 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.
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
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105 ± 5 in lb
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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