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National standard for cemented carbide ball

Release time:2023-11-14

Tolerance class and technical requirements
Grade	Variation of ball diameter	spherical deviation	Stadium surface roughness	Batch diameter variation	Basic diameter tolerance
	Vdws	△Sph	Ra	Vdwl	Tdn
	No more
	um
10	0.25	0.25	0.025	0.5	*
16	0.4	0.40	0.032	0.8	*
20	0.5	0.50	0.04	1	*
28	0.7	0.70	0.05	1.4	*
40	1.0	1.00	0.08	2	*
60	1.5	1.50	0.10	3	*
100	2.5	2.50	0.125	5	±12.5
200	5	5	0.2	10	± 25
500	13	13	*	25	± 50
1000	25	25	*	50	±125
* means not used

Batch diameter variation and common gauge value, sub-gauge value
Grade	Amount of change in batch straight-through	Gauge straight spacing	Common gauge value	Scoreboard value	Scoreboard value
Grade	um
10	0.5	1	-9,…,-1,0, 1,…, 9	0.2	-0.4,-0.2,0, 0.2, 0.4
16	0.8	2	-10,…,-2,0, 2,…, 10	0.4	-0.8,-0.4,0, 0.4, 0.8
20	1	2	-10,…,-2,0, 2,…, 10	0.4	-0.8,-0.4,0, 0.4, 0.8
28	1.1	2	-12,…,-2,0, 2,…, 12	0.4	-0.8,-0.4,0, 0.4, 0.8
40	2	4	-16,…,-4,0, 4,…, 16	0.8	-1.6,-0.8,0, 0.8, 1.6
60	3	5	-20,…,-5,0, 5,…, 20	1	-2,-1,0, 1, 2