IBM 6400 Series, Maintenance Information Manual

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339
D
Torque Table
The table below 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. For
the most accurate torquing, apply anti-seize compound to fastener threads
before you torque the fastener.
Fastener sizes are listed as Numbered Size - Threads Per Inch . (For
example, 2-56 represents “No. 2 Screw, 56 Threads Per Inch.)
Carbon Steel Fasteners (ANSI B18.6.3 - 1972)
Fastener
Size
Into Alum. or
Brass
25,000 psi
ultimate
tensile
strength
Into Steel
60,000 psi
ultimate
tensile
strength
Into Weld/
Press Studs
or Nuts
Into
Medium
Carbon
Steel
Fasteners
100,000 psi
ultimate
tensile
strength
2-56 25 ± 2 in oz 36 ± 2 in oz 30 ± 2 in oz *
4-40 62 ± 4 in oz 75 ± 5 in oz 70 ± 5 in oz *
6-32 122 ± 7 in oz 150 ± 10 in oz 135 ± 10 in oz *
8-32 11 ± in lb 18 ± 1 in lb 18 ± 1 in lb *
10-24 20 ± 1 in lb 25 ± 1.5 in lb 21 ± 1 in lb *
10-32 15 ± 1 in lb 29 ± 2 in lb 29 ± 1 in lb *
1/4 - 20 40 ± 3 in lb 62 ± 4 in lb 62 ± 4 in lb 105 ± 5 in lb
Fastener Sizes
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