US Standard Bus Connection Bolt Torque Values.pdf
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- 1305M222QNMAN0008
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This document provides standard torque values for bus connection bolts and fasteners made from various materials. It specifies torque limits in foot-pounds for bolts of different diameters made from heat treated steel, silicon bronze, stainless steel, and aluminum alloy.
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Text version
PEARL Reconditioning Standards
U. S. STANDARD BUS CONNECTION BOLT
TORQUE VALUES
Revision Section Number Date 6001 3 2-11-03
TABLE 1
U. S. Standard Bus ConnectionBolt Torque Values
Heat Treated Steel – Cadmium Or Zinc Plated
GRADE SAE 1 & 2 SAE 5 SAE 7 SAE 8
MINIMUM
TENSILE
(P.S.I.)
64K 105K 133K 150K
BOLT
DIAMETER
(IN INCHES)
TORQUE (FOOT POUNDS)
1/4 4.0 5.6 8.0 8.4 5/16 7.2 11.2 15.2 17.6 3/8 12.0 20.0 27.2 29.6 7/16 19.2 32.0 44.0 48.0 1/2 29.6 48.0 68.0 73.6 9/16 42.4 70.4 96.0 105.6
5/8 3/4 59.2 96.0 96.0 160.0 133.6 224.0 144.0 236.8
7/8 152.0 241.6 352.0 378.4
1.0 225.6 372.8 528.0 571.2
Silicon Bronze Fasteners*
Torque (Foot-Pounds)
Bolt Diameter in Inches Non-Lubricated Lubricated 5/16 15 10 3/8 20 14 1/2 40 25 5/8 55 40 3/4 70 60
* Bronze alloy bolts shall have a minimum tensile strength of 70,000 pounds per square inch.
PEARL Reconditioning Standards
U. S. STANDARD BUS CONNECTION BOLT
TORQUE VALUES
Revision Section Number Date 6001 3 2-11-03
Stainless Steel Fasteners**
Torque (Foot Pounds)
Bolt Diameter in Inches Uncoated 5/16 14 3/8 25 1/2 45 5/8 60 _ 90
** Bolts, cap screws, nuts, flat washers, locknuts: 18-8 alloy. ** Belleville Washers: 302 alloy.
Aluminum Alloy Fasteners*** Torque (Foot Pounds)
Bolt Diameter in Inches Lubricated 5/16 8.0 3/8 11.2 1/2 20.0 5/8 32.0 3/4 48.0
*** Aluminum alloy bolts shall have a minimum tensile strength of 55,000 pounds per square inch.
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