Printronix P9012 Maintenance Manual page 245

D
Torque Table
Torque values specified in replacement procedures (Chapter 6) take
precedence over Table D–1.
Table D–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.
Fastener
Size
2–56
4–40
6–32
8–32
10–24
10–32
1/4 – 20
Fastener Size
4–40 UNC & 4–48 UNF
6–32 UNC & 6–40 UNF
8–32 UNC & 8–36 UNF
10–24 UNC & 10–32 UNF
Torque Table
IMPORTANT
Table D–1. Torque Table
Carbon Steel Fasteners
(ANSI B18.6.3 – 1972)
Into Alum. Into Steel
or Brass 60 000 psi
25 000 psi ultimate
ultimate tensile
tensile strength
strength
25 2 in oz 36 2 in oz
62 4 in oz 75 5 in oz
122 7 in oz 150 10 in oz
11 1 in lb 18 1 in lb
20 1 in lb 25 1.5 in lb
15 1 in lb 29 2 in lb
40 3 in lb 62 4 in lb
Torque for Routine Tightening of Threaded
Fasteners
4 1 in lb
11 1 in lb
19 1 in lb
25 1 in lb
Into Into Medium
Weld/Press Carbon Steel
Studs or Fasteners
Nuts 105,000 psi
ultimate tensile
strength
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
D–1