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Bolt and Torque specs

U.S. BOLT GRADES

sae2 bolt sae5 bolt sae7 bolt sae8 bolt
SAE 2 SAE 5 SAE 7 SAE 8
Made of low carbon, min. 74,000 psi tensile strength. Made of tempered medium carbon, min. 120,000 psi tensile strength Made of Medium-carbon,
quenched & tempered. min. 133,000 psi tensile strength.
Made of Medium-carbon, quenched & tempered. min. 150,000 psi tensile strength.
 

U.S. BOLT TORQUE SPECIFICATIONS
Torque in pounds-foot

 

 

SAE 2

SAE 2

SAE 5

SAE 5

SAE 7

SAE 7

SAE 8

SAE 8











Bolt
 Dia.

Thread
per inch

Dry

Oiled

Dry

Oiled

Dry

Oiled

Dry

Oiled

1/4 20 4 3 8 6 10 8 12 9
1/4 28 6 4 10 7 12 9 14 10
5/16 18 9 7 17 13 21 16 25 18
5/16 24 12 9 19 14 24 18 29 20
3/8 16 16 12 30 23 40 30 45 35
3/8 24 22 16 35 25 45 35 50 40
7/16 14 24 17 50 35 60 45 70 55
7/16 20 34 26 55 40 70 50 80 60
1/2 13 38 31 75 55 95 70 110 80
1/2 20 52 42 90 65 100 80 120 90
9/16 12 52 42 110 80 135 100 150 110
9/16 18 71 57 120 90 150 110 170 130
5/8 11 98 78 150 110 190 140 220 170
5/8 18 115 93 180 130 210 160 240 180
3/4 10 157 121 260 200 320 240 380 280
3/4 16 180 133 300 220 360 280 420 320
7/8 9 210 160 430 320 520 400 600 460
7/8 14 230 177 470 360 580 440 660 500
1 8 320 240 640 480 800 600 900 680
1 12 350 265 710 530 860 666 990 740

BOLT TORQUE FACTORS

LUBRICANT OR PLATING TORQUE CHANGES
Oil Reduce torque 15% to 25%
Dry Film (Teflon or moly based) Reduce torque 50%
Dry Wax (Cetyl alcohol) Reduce torque 50%
Chrome plating No change
Cadmium plating Reduce torque 25%
Zinc plating Reduce torque 15%

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