US_Standard_Bus_Connection_Bolt_Torque_Values.pdf

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NOAA Ship RONALD H. BROWN DOCKSIDE REPAIRS Federal contract opportunity
Solicitation number
EA-133M-17-RP-0081
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Department of Commerce National Oceanic and Atmospheric Administration

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US Standard Bus Connection Bolt Torque Values

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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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