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ASTM A320 Grade L7

This specification related to ASTM A320 grade L7 includes stainless and alloy steel fasteners. These fasteners are used in various applications for low temperatures to make hardened, rolled, forged bars, bolts, screws, studs, and others.

Below we have mentioned the grades that fall under A320

A320 Grade L7

L7 AISI 4140/4142 Quenched and tempered

Mechanical properties

Grade Size Tensile ksi, min Yield ksi, min Elong %, min RA % min HBW Rockwell
L7 Up to 2-1/2 125 105 16 50 321 Max 35 max

Chemical properties

Element L7 (AISI 4140)
Carbon 0.38 - 0.48%
Manganese 0.75 - 1.00%
Phosphorus, max 0.035%
Sulfur, max 0.040%
Silicon 0.15 - 0.35%
Chromium 0.80 - 1.10%
Nickel -
Molybdenum 0.15 - 0.25%

Related hardware

Bolt Grade Nut Washers
L7 A194 Grade 4 or 7 F436