Steel 135 Mod AMS 6472

AMS 6472 is the aerospace material specification covering 135 Mod nitriding steel (UNS K24065) bars and forgings supplied hardened and tempered to a minimum tensile strength of 112 ksi (772 MPa). Typical hardness is 241–285 HB.

AMS 6472 is delivered with the core heat treatment already done. With the other 135 Mod specs, the buyer must harden, quench and temper before nitriding. AMS 6472 bar arrives at a certified core strength, so parts go straight from stock to machining and then to the nitriding furnace. That removes a heat-treat step, avoids quench distortion and cracking risk in the shop, and cuts lead time. The 112 ksi level is moderate, which keeps the steel machinable while still giving a strong, tough core under the case. That makes AMS 6472 well suited to medium-strength wear parts produced in volume.

Typical AMS 6472 parts:

• Gears, pinions and sprockets machined directly from pre-hardened bar
• Pump and compressor shafts with nitrided bearing journals
• Cams, followers and wear plates
• Die, mold and tooling components needing a hard, low-distortion surface

If the design needs a different core strength, and you prefer to run your own hardening and tempering, see the companion specification AMS 6470.

Tech Steel & Materials stocks and supplies AMS 6472 hardened-and-tempered bar and forgings to aerospace and defense tolerances. Request a quote for certified material cut to your size and quantity.