Quality Hardware and Materials

Why do we insist on using Grade 8 hardware and DOM tubing? We’ll let the numbers speak for themselves.

Material Yield Strength, PSI*
ASTM Grade A-53 pipe 30, 000
1020 ERW tube 40, 000
1020 DOM 70, 000
4130 Cr-Mo 90,000
4340 Cr-Mo 120,000
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
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

Standard Bolt Head Markings

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