Nitriding 135M

Nitriding 135M is a low alloy nitriding grade that provides a high case hardness while still maintaining high strength in the core.  This alloy is perfect for when high surface hardness for wear and abrasion is needed, such as stressed gears in rotorcraft industry.  Nitriding 135M is suitable up to 1000°F.

FOR REQUIREMENTS: Nitriding Grade, High Case Hardness 


SPECIFICATIONS: AMS 6470 and 6471 – Domestically Produced 

Benefits of Nitriding 135M

  • High Case Hardness and Core Strength
  • Supplied in Pre-Hardened Condition – 28-32 HRC
  • Heat Resistance to temps up to 1000°F
  • Good Resistance to Corrosion
  • Alternative to AISI 4140

Typical Applications

  • Aircraft and High Performance Gears
  • Crankshafts and Camshafts
  • Pinions, Bushings, & Bolts
  • Pump Parts, Valve Sleeves, and Hydraulic Parts

Chemical Composition – VAR

  C Cr Si Ni Mn Mo Al P
min. 0.38 1.40 0.20 0.50 0.30 0.95
max. 0.43 1.80 0.40 0.25 0.80 0.40 1.20 0.025

Stocking Sizes

0.375″ – 3.000″Ø 


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