Aircraft Steel 135 Mod / Nitriding (AMS 6470 / AMS 6472 / AMS 6471)

Technical Data Sheet


Chemical Composition Limits
Weight% C Mn Si Cr Mo Al
NITRALLOY 135™Modified VAC-ARC 0.40 0.60 0.30 1.60 0.35 1.20

NITRALLOY 135™Modified VAC-ARC is a low alloy nitriding grade of steel with moderate hardenability. As will all nitriding steels NITRALLOY 135™Modified VAC-ARC provides a high case hardness without affecting the core properties of the metal. NITRALLOY 135™Modified VAC-ARC is generally used for aircraft gears, shafts, pinions, crankshafts, cams, camshafts and bolts.

NITRALLOY 135™Modified VAC-ARC is available in bar (round bar).  For all stock availability contact Sales.

Typical Mechanical Properties


Material Size in Section
Ultimate Tensile Strength (Mpa) Yield Strength (Mpa) % Elongation % Reduction of Area Hardness HBW
NITRALLOY 135™Modified VAC-ARC 3.8 930 690 16 50 280-340
NITRALLOY 135™Modified VAC-ARC 3.8-7.6 860 620 15 40 280-340 on surface
269-321 on test specimen
NITRALLOY 135™Modified VAC-ARC 7.6-12.7 760 580 15 40 269-321 on surface
240-300 on test specimen

AMS 6470
AMS 6471 (Vac Melt)
AMS 6472
AMS 2301
AMS 2304
ASTM A322   


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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.