Steel 135 Mod AMS 6470

AMS 6470 is the aerospace material specification covering 135 Mod nitriding steel (Nitralloy 135 Modified, UNS K24065) bars, forgings and tubing. The steel is conventionally air melted. Its aluminum content lets it form a nitrided case harder than 60 HRC over a quenched-and-tempered core.

AMS 6470 is the standard, general-purpose 135 Mod specification and gives the buyer full control of heat treatment. The material is supplied in a machinable condition, not hardened. The part maker rough machines, hardens and tempers to the core strength the design needs, finish machines, and then nitrides. It is also one of only two 135 Mod specifications that include tubing, which suits hollow shafts, sleeves and bushings that need a wear-resistant bore or outside diameter. Its successor to the former military specification, AMS-S-6709, is often cited alongside it on older drawings.

Typical AMS 6470 parts:

• Industrial and aerospace gears, pinions and splined shafts
• Hollow shafts, sleeves and bushings from tubing
• Cams, camshafts and valve-train components
• Wear-resistant bolts, pins and tooling components

For parts that need vacuum-melted cleanliness, see the companion specification AMS 6471. Full composition, heat-treat and nitriding data are on the 135 Mod steel page. Tech Steel & Materials stocks and supplies AMS 6470 bar, forgings and tubing to aerospace and defense tolerances. Request a quote for certified material cut to your size and quantity.