Stainless Steel AISI 440C (Martensitic)

These balls give maximum hardness with good corrosion resistance to fresh water, steam, crude oil, gasoline, alcohol, food environment, blood and perspiration.  In addition this material is ferro-magnetic and makes a fair permanent magnet.  Balls are deep freeze stabilised after heat treatment.

International Equivalents

AISI 440C, DINX105 CR Mo17, JIS SUS 440C, Z100CD17 Wks 1.4125


Material Specification


C 0.95 – 1.20 %
Cr 16 – 18 %
Si 1.0 % Max
Mn 1.0 % Max
P 0.04 % Max
S 0.03 % Max
Mo 0.75 % Max



HRc 57 – 60


Mechanical Properties

Tensile Strength 285,000 psi
Yield Strength 275,000 psi
Density 0.277 lbs/cu in


Size Range

0.635mm (0.025″) to 101.6mm (4″)


Standard Grades Available


VTLG Asia is the first Asian-based German supplier of products and services to the capital equipment and Industrial component industry. For inquiries and requests please contact us at: VTLG specializes in supplying ball products to the linear guide, ball screw and ball retainer industry.