A193 B8 Class 2 Heavy Hex Bolts Canada

Heavy hex bolts built to the spec

ASTM A193 Grade B8 Class 2 — Type 304, carbide solution treated and strain hardened
Heavy hex head, UNC or 8UN threads
Marked B8SH (underlined) for Class 2 identification
Lengths and thread lengths to your bolt list
Matching A194 Grade 8 heavy hex nuts and washers quoted on request

Why it matters for headed bolts

Class 2 strength comes from cold working, and heating the bar to hot forge a head relieves that strain hardening in the head area. That makes properly made Class 2 heavy hex bolts harder to find than studs — and it is why many suppliers quote long lead times or push you toward a substitution. Benchmark quotes 18–25 days.

Mechanical properties

Nominal diameter	Min. tensile (ksi)	Min. yield (ksi)	Min. elongation	Max. hardness
Up to 3/4″	125	100	12%	35 HRC
7/8″ – 1″	115	80	15%	35 HRC
1-1/8″ – 1-1/4″	105	65	20%	35 HRC
1-3/8″ – 1-1/2″	100	50	28%	35 HRC

Per ASTM A193/A193M for Grade B8 Class 2 (Type 304, carbide solution treated and strain hardened). Class 1 B8 is 75 ksi tensile / 30 ksi yield at all diameters. Always confirm requirements with the engineer of record.

Common applications

Bridge bearing and anchor plate connections
Stainless structural connections in corrosive or wash-down environments
Flanged piping, valves and pressure equipment

Need threaded rod or studs instead? See B8 Class 2 threaded rod and stud bolts or the B8 Class 2 overview.

Request a quote

Send diameter, length, thread length, quantity and required date — or call 800-580-4195.

Request a B8 Class 2 Quote | Call 800-580-4195