instrument and implant grade metal alloys

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Stainless Steel 440A (1.4108) Medical Alloy

440A is a hardenable martensitic stainless steel with a lower Carbon content than 440B or 440C giving it slightly higher corrosion resistance than the later two. The addition of Molybdenum and a higher Carbon content provide this steel with good hardenability up to 56HRC where it exhibits good wear resistance making it widely used in production of bearings, nozzles, valve components and blade items.


Medical instruments
Surgical instruments
Dental instruments
Cutting instruments

Typical Chemical Composition

C Si Mn P S Cr Mo Ni V Nb N Fe
Min 0.25 14.00 0.85 0.30
Max 0.35 1.00 1.00 0.030 0.025 16.00 1.10 0.50 0.50 Balance

Typical Mechanical Properties

Condition Tensile (Rm)
Yield (R0.2%)
Cold drawn 700-950
Hardened 56


ISO 7153-1 (S)
EN X70CrMo15
DIN X70CrMo15
UNS S44002


Stainless Steel 440A (1.4108) Medical Alloy is available in wire and round bar from 1.70mm diameter up to 50.8mm diameter

Disclaimer : 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.

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Metal Weight Calculator

Metal Alloy



NOTE: Weights calculated are theoretical. Manufacturing tolerances should be allowed for and results adjusted accordingly.