ASTM A453 Grade 660

High Temperature Stainless Steel Bolting Material Specification

ASTM A453 Grade 660

ASTM A453 Grade 660 Studs ASTM A453 Grade 660 is a material specification for studs, bolts, nuts and other fasteners, intended for use in high temperature bolting applications. ASTM A453 Grade 660 is classified into 4 property class namely A, B, C & D, each designated with different tensile and stress rupture properties. Grade 660 fasteners are used in bolting boilers, pressure vessels, pipeline flanges and valves, intended for high temperature service. ASTM A453 grade 660 material is chemically equivalent to ASTM B638 grade 660 stainless steel alloy, also known by alloy A286 and UNS S66286, heat treated to achieve properties defined in ASTM A453 specification.

Find more information on chemical composition, mechanical properties, tensile class, heat treatment definition, available products, bar stock sizes, applicable dimension standards, etc.

ASTM A453 Grade 660 Tensile Class

Class A Class B Class C Class D

ASTM A453 Grade 660 Fasteners

Product Standards

Imperial Metric
Studs 976 -- B18.31.2 B18.31.1M 6610
Hex Bolts 931 4014 B18.2.1 B18.2.3.5M 5737
Heavy Hex Bolts 6914 7412 B18.2.1 B18.2.3.7M 5712
Hex Cap Screws 933 4017 B18.2.1 B18.2.3.1M 5739
Socket Head Cap Screws 912 4762 B18.3 B18.3.1M 5931
Set Screws 916 4029 B18.3 B18.3.1M 5929
Countersunk Screws 7991 10642 B18.3 B18.3.1M 5933
Hex Nuts 934 4032 B18.2.2 B18.2.4.1M 5588
Heavy Hex Nuts 6915 4775 B18.2.2 B18.2.4.6M 5713