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Material Specification

AISI 4137

AISI 4137 Fasteners

Chromium Molybdenum Steel AISI 4137

Buy AISI 4137 bolts, nuts and other fasteners from Exotic Alloy, a premier manufacturer & supplier of AISI 4137 bolting materials to ASTM A29, ASTM A322, ASTM A193, and API specifications. Widely known as Chromoly, this high-strength low-alloy (HSLA) steel leverages chromium for excellent hardenability and corrosion resistance, combined with molybdenum for exceptional high-temperature toughness and impact strength.

Exotic Alloy fasteners offer AISI 4137 bolts and nuts with standard and custom manufacturing to your exact specification. We cover AISI 4137 hex bolts, studs, stud bolts, hex nuts, washers, threaded rod and other fastener in metric and inch sizes with coarse, fine and extra fine threads to ASME, UN, BS, ISO and DIN standards.

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AISI 4137 Bolting Products

AISI 4137 Specifications

  • ASTM A29 / A29M
  • ASTM A322 / A331
  • ASTM A193 (e.g., Grade B7 / B7M)
  • SAE J404
  • API Spec 6A & 7-1 (Oil & Gas)
  • DIN EN 10083-3 (e.g., 42CrMo4)
  • ISO 683-1 / 683-2
  • JIS G4053 (SCM Series)
AISI 4137 Material Datasheet

AISI 4137 Properties

Chemical Composition
Elements C Mn P S Si Cr Mo Fe
Min % 0.15 0.70 - - 0.15 0.80 0.15 Balance
Max % 0.65 1.20 0.035 0.040 0.35 1.20 0.35 Balance
Mechanical Properties
Annealed 655 415 25 % 197 HB
Normalized 1020 655 17 % 302 HB
Quenched & Tempered (400°C) 1380 1240 11 % 400 HB
Quenched & Tempered (550°C) 1030 900 16 % 310 HB

AISI 4137 Characteristics

  • Exceptional strength-to-weight ratio ideal for critical structural components
  • Deep, uniform hardenability with reduced risk of quench cracking
  • High creep strength and performance retention at elevated temperatures (up to 540°C)
  • Outstanding resistance to torsional fatigue and heavy impact loads
  • Readily machinable in the annealed state and easily weldable (with pre/post-heating)

AISI 4137 Applications

  • High-tensile industrial bolting (ASTM A193 B7 studs, heavy hex nuts, tie rods)
  • Oil and gas drilling equipment (drill collars, Kelly bars, high-pressure valves)
  • Aerospace structural tubing, roll cages, and engine mounts (e.g., 4130)
  • Automotive racing components, connecting rods, forged crankshafts, and axles
  • Heavy machinery shafts, hydraulic cylinders, and power transmission gears