4mm Diameter Grade 100 Hardened AISI 420 Stainless Steel Ball Bearings Simply Bearings Ltd

Industry Standard Grade 100 420 Stainless Ball Bearings: High Quality Graded 420 Stainless Steel Ball bearings made from AISI 420 Stainless Steel with a hardness of 52 -55 HRC Rockwell Scale, the hardness is all the way through the ball. These are the same stainless 420 steel balls used to manufacture bearing assemblies and have a high duty and life cycle.
The most commonly used martensitic stainless steel giving fair corrosion resistance to fresh water, steam, petrol, alcohol, blood, sweat, oils and foodstuffs.
Manufactured in compliance to the following international standards: AISI 420 / BS970 420S37 420S45 / DIN 1.4021, 1.4025, 1.4034 / AFNOR Z30C13, Z40C14 / JIS SUS 4200JI, 420J2

Material	=	420 Stainless Steel
Min Crush Load	=	1000kg
Hardness	=	52-55 HRC
Hardness Depth	=	Through Hardened
Corrosion Resistance	=	Good
Note	=	Not Drillable
Approx Weight Each	=	0.26g
Attracted to Magnets	=	Yes
Avg Qty / Litre	=	18500

GRADES
Grade	Diameter Tolerance Per Ball		Sphericity		Diameter Tolerance per Unit Container		Diameter Tolerance		Max Surface Roughness
-	Inch	µ	Inch	µ	Inch	µ	Inch	µ	Inch	µ
3	0.000003	0.076	0.000003	0.076	0.000005	0.127	±.00003	±0.076	0.5	0.013
5	0.000005	0.127	0.000005	0.127	0.000001	0.25	±.000005	±0.127	0.8	0.02
10	0.00001	0.25	0.00001	0.25	0.00002	0.51	±.0001	±2.5	1	0.025
15	0.000015	0.38	0.000015	0.38	0.00003	0.76	±.0001	±2.5	1.2	0.03
25	0.000025	0.63	0.000025	0.63	0.00005	1.27	±.0001	±2.5	1.5	0.038
50	0.00005	1.27	0.00005	1.27	0.0001	2.5	±.0002	±5	3	0.075
100	0.0001	2.5	0.0001	2.5	0.0002	5	±.0005	±5	5	0.125
200	0.0002	5	0.0002	5	0.0004	10	±.0010	±10	8	0.2
300	0.0003	7.5	0.0003	7.5	0.0006	15	±.0015	±37.5	Not applicable	Not applicable
500	0.0005	12.5	0.0005	12.5	0.001	25	±.002	±50	Not applicable	Not applicable
1000	0.001	25	0.001	25	0.002	50	±.005	±125	Not applicable	Not applicable
2000	0.002	50	0.002	50	0.004	100	±.005	±125	Not applicable	Not applicable

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