Resitant Metal Alloys Fasteners is a manufacturer and supplier of AISI 4340 Fasteners such as bolts, screws, stud bolts, threaded rods, nuts, washers and other bolting components. AISI 4340 is a chromium-molybdenum alloy steel with high strength properties, used for manufacturing wide range of fasteners across ASTM and ISO bolting standards.

AISI 4340 alloy steel fasteners are manufactured using as rolled bar stock followed by quench and tempering to achieve full grade strength as required to A320 L43, F568 Grade Class 12.9 & ISO 898 specifications.

AISI 4340 Technical Data Sheet

AISI 4340 Fasteners

AISI 4340 Equivalent Grades

AISI 4340 Properties

AISI 4340 Chemical Composition
Carbon	Manganese	Sulphur	Phosphorus	Silicon	Molybdenum	Chromium
0.38 - 0.43 %	0.75 - 1.00 %	0.04 % max	0.035 % max	0.15 - 0.30 %	0.15 - 0.25 %	0.80 - 1.10 %

AISI 4340 Mechanical Properties
Tensile Strength	Yield Strength	Hardness, Rockwell	Hardness, Brinell
655 MPa (Min.)	415 MPa (Min.)	25 - 70	197 (Min.)

AISI 4340 Fastener Specifications