德國鋼球、鋼珠質量標准

CLASS	Nominal Dia.mm	Tolerances (U)	Tolerances Per group(U)	Mean interval of each group (U)											Spherical deviation
Ⅰ	10Max	±10.25	0.5	-10～-1.5			-1	-0.5	0	+0.5	+1	+1.5～+10			0.25
Ⅱ	25Max	±10.50	1	-10～-3			-2	-1	0	+1	+2	+3～+10			0.5
Ⅲ	25Max	±11	2	-10	-8	-6	-4	-2	0	+2	+4	+6	+8	+10	1
	25-50	±13.5	3		-12	-9	-6	-3	0	+3	+6	+9	+12		1.5
	59-75	±14	4			-12	-8	-4	0	+4	+8	+12			2
	75-100	±17.5	5			-15	-10	-5	0	+5	+10	+15			2.5
	100-125	±21				-18	-12	-6	0	+6	+12	+18			3
	125-150	±24.5	7			-21	-14	-7	0	+7	+14	+21			3.5
Ⅳ	10Max	±14	4			-12	-8	-4	0	+4	+8	+12			2
Ⅴ	25Max	±75	50					-50	0	+50					25
	25-50	±113	75					-75	0	+75					38
	50-70	±150	100					-100	0	+100					50
	75-100	±188	125					-125	0	+125					63
	100-125	±225	150					-150	0	+150					75
	125-150	±263	175					-175	0	+175					88
Ⅵ		±200	400