instrument and implant grade metal alloys

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Stainless Steel 420 Mod (1.4123) Medical Alloy

420 Mod (1.4123) is a martensitic stainless steel alloyed with Molybdenum, Vanadium and Nitrogen making it ideal for all types of medical, surgical and dental instruments requiring good wear, resistance to blunting and high quality mirror polishing. It is produced by ESR remelting and has better corrosion resistance than similar grades such as 440B and 440C. With hardening it can reach hardnesses up to 57HRC.


Medical instruments
Surgical instruments
Dental instruments
Drills, taps, cutting tools

Typical Chemical Composition

C Si Mn P S Cr Mo Ni V Nb N Fe
Min 0.35 14.00 1.00 0.10
Max 0.50 1.00 1.00 0.040 0.015 16.00 2.50 0.50 1.50 0.30 Balance

Typical Mechanical Properties

Condition Tensile (Rm)
Yield (R0.2%)
A4d (%)
Annealed 120 67 21 250


EN X40CrMoVN16-2
DIN X40CrMoVN16-2
NF S 94-090
UNS S42025


Stainless Steel 420 Mod (1.4123) Medical Alloy is available in wire and round bar from 1.65mm diameter up to 105mm 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.