SAE Bolt Strength

Bolt Safe Working Loads (lbs)
(Safe tensile load at 6,000 psi load)
(Safe shear strength at 7500 psi load)

BoltDia(in)

NF Thread Grade 2 Iron Bolt
Shear
(at thread root)
Shear
(Full Bolt)
Tensile
(at thread root)
1/4 200 370 160 
5/16  340 575 270
3/8 510 830 410
7/16  700 1130 560 
1/2  940 1470 760 
9/16       
5/8  1510  2300 1210 
3/4  2260 3310 1810 
7/8 3140 4510 2520
1 4130 5890 3300
1 1/8 5200 7450 4160
1 1/4 6670 9200 5350
1 3/8 7900 11130 6340
1 1/2 9700 13250 7700
1 5/8 11360 15550 9090
1 3/4 13080 18000 10470
1 7/8 15370 20700 12300
2 17250 23560 13800
 
Bolt Tensile Strength (Breaking Strength -lbs)
BoltDia(in) Grade 2 Grade 5 Grade 8
Coarse Fine Coarse Fine Coarse Fine
1/4  2350  2700 3800  4350 4750  5450
5/16  3900  4300 6300  6950 7850  8700
3/8            
7/16  7850  8800 12800  14400 15900  17800
1/2  10500  11800 17000  19200 21300  24000
9/16  13500  15000 21800  24400 27300  30400
5/8  16700  18900 27100  30700 33900  38400
3/4  24700  27600 40100  44800 50100  56000

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