4mm Diameter Grade 100 AISI 316 Stainless Steel Ball Bearings Simply Bearings Ltd

These stainless steel balls are made from AISI 316 Stainless Steel.
Un-hardened but consistently hard all the way through the ball to achieve maximum strength and quality.
Ball hardness is controlled within the 25 - 39 HRC range as measured on parallel flat surfaces.
Ball grades are defined numerically 50 - 1000 (50 being highest quality available in 316 stainless, 1000 is the lowest)
316 Stainless balls are NOT attracted to magnet but may show response to magnets after cold working.

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

Theo Raymond, United Kingdom
Review added on 28/06/2019

Quality ball bearings, value , service and delivery super. A complete buying experience. Highly recommended
Ayaan Mcbride, United Kingdom
Review added on 26/04/2019

great service, quality item as described.
Johnny Randall, United Kingdom
Review added on 24/08/2018

Just what I needed
Jesse Jagger, United Kingdom
Review added on 20/12/2017

As described
Dario Donald, United Kingdom
Review added on 14/02/2017

As described