National standard for cemented carbide balls

Time：2023-04-25 10:15

Tolerance classes and technical requirements
Rank	ball diameter variation	spherical deviation	Court surface roughness	Batch diameter variation	basic diameter tolerance
	Vdws	△Sph	Ra	Vdwl	Tdn
	Not more than
	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
*Do not use

batch diameter variation and common gauge values, sub-gauge values
Rank		gauge spacing	Common gauge
Rank	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