Tel: 860-571-3602  |
Tel: 860-571-3602  |

Stainless Steel Balls: AISI-440C

AISI 440C Stainless Steel Balls Specifications


Carbon Chromium Molybdenum
0.95 – 1.20% 16 – 18% 0.75% max

View Sizes, Grades, and Tolerance


AISI 440C stainless steel balls provide maximum hardness, toughness and dimensional stability. They are highly resistant to rolling-contact fatigue. 440C stainless steel balls are used in a hardened condition, perform similarly to tool steels, and are ideal for antifriction bearings (rolling bearings).


440C stainless steel balls achieve the highest hardness following heat treatment: Rockwell C 58 to 62. Hartford 440C stainless steel balls are passivated to remove free iron contaminants and facilitate spontaneous formation of a protective passive film.

Corrosion Resistance

440C stainless steel balls generally have excellent resistance to mild acids, alkalis, foods, fresh water and air.


Rockwell C 58-62 measured on parallel flats.


Available in sizes from 1mm to 50.8mm in grades 10 through 1000.

Hartford Technologies is a multinational supplier of 440C stainless steel balls for applications including actuators, pumps and bearings.

Hartford Technologies design engineers are among the most knowledgeable in the industry, and our ability to manufacture on both sides of the globe gives Hartford customers a substantial advantage in cost and flexibility. We produce more than one billion balls per year for high volume OEM applications and can provide fast turn-around to meet stringent delivery requirements.

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