ASTM A320 Grade L7 Heavy Hex Bolt

A320 Grade L7 is intended for low-temperature service down to -150° F and has a minimum Charpy impact value of 20-ft-lbf at this temperature.
ASTM A320 Grade L7 Nuts and ASTM A320 Grade L7 Bolts are manufactured from AISI 4140 and AISI 4145 stainless steel respectively, which has been quenched and tempered to enlarge the strengt.
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Product Details

ASTM A320 Grade L7, 4140 Alloy Steel

We offer full range of sizes, threads and fasteners such as hex bolts, heavy hex bolts, hex cap screws, socket head cap screws, full threaded stud bolts, double end studs, threaded rods, eye bolts and anchor bolts, etc.,

ASTM A320 Grade L7 Fasteners


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Material Chemical Composition

ElementL7 (AISI 4140)
Carbon0.37 - 0.49%
Manganese0.65 - 1.10%
Phosphorus, max0.035%
Sulfur, max0.040%
Silicon0.15 - 0.35%
Chromium0.75 - 1.20%
Molybdenum0.15 - 0.25%

FAQs on Bolts

What are the marks shown on the head of a bolt?

The marks shown on the head of a bolt represent the hardness of the bolt. No marks indicate the softest bolt, whereas three marks indicate medium hardness and six marks indicate the hardest.


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