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  • a193 b8m class 2 bolts canada

A193 B8M Class 2 Bolts Canada

A193 B8 Class 2 stainless steel bolts with nuts and washers

316 Stainless, Strain Hardened

Benchmark supplies ASTM A193 Grade B8M Class 2 strain hardened Type 316 stainless steel heavy hex bolts, threaded rod and stud bolts, with a typical lead time of 18–25 days. B8M adds molybdenum for better resistance to chlorides, de-icing salts and chemical exposure than B8 (304).

Request a B8M Class 2 Quote  |  Call 800-580-4195

When to specify B8M instead of B8

  • Chlorides and salt: bridges, parkades and marine structures exposed to de-icing salt or seawater
  • Chemical and process plants: wastewater, pulp and paper, food processing and chemical service
  • Pitting and crevice corrosion: the 2–3% molybdenum in 316 resists pitting better than 304

If corrosion is not the driver, B8 Class 2 (304) offers higher minimum strength at the same diameters.

What we supply

  • A193 B8M Class 2 heavy hex bolts
  • A193 B8M Class 2 threaded rod and stud bolts, cut to length
  • Custom lengths and thread lengths to your bolt list or drawing
  • A194 Grade 8M nuts and washers quoted with the bolts (strain hardened where specified)

B8M Class 2 mechanical properties

Nominal diameterMin. tensile (ksi)Min. yield (ksi)Min. elongationMax. hardness
Up to 3/4″1109515%35 HRC
7/8″ – 1″1008020%35 HRC
1-1/8″ – 1-1/4″956525%35 HRC
1-3/8″ – 1-1/2″905030%35 HRC

Per ASTM A193/A193M for Grade B8M Class 2 (Type 316, carbide solution treated and strain hardened). Class 1 B8M is 75 ksi tensile / 30 ksi yield at all diameters. Always confirm requirements with the engineer of record.

B8M Class 2 vs B8 Class 2

B8 Class 2B8M Class 2
Stainless gradeType 304Type 316 (with molybdenum)
Tensile, up to 3/4″125 ksi110 ksi
Yield, up to 3/4″100 ksi95 ksi
Chloride / salt resistanceGoodBetter
Head markingB8 with Class 2 identificationB8M with Class 2 identification

What to send for a fast quote

  • Grade and class (A193 B8M Class 2) and any project specification
  • Diameter, thread pitch (UNC / 8UN) and overall length
  • Thread length, or full thread for studs and rod
  • Quantity, and nuts and washers if required
  • Delivery location and required date

Related: B8 Class 2 heavy hex bolts · B8 Class 2 threaded rod and studs · A193 B8 Class 2 bolts Canada

Get your B8M Class 2 bolts in 18–25 days

Send your bolt list using the form below or call 800-580-4195. We quote a firm lead time up front.