Type	Outside Diameter (mm)		Inside Diameter (mm)		Height (mm)		No. of bridges
	d1		d2		h
	Measure	Tolerance +/-	Measure	Tolerance +/-	Measure	Tolerance +/-
20mm	21.400	0	18.950	0.050	12.900	0	7
22mm	22.425	0.025	22.125	0.025	15.200	0.050	7
25mm	25.625	0.025	25.175	0.025	16.625	0.025	7
28mm	28.425	0.025	28.125	0.025	18.075	0.025	8
29/35mm	29.425	0.025	29.200	0.050	34.475	0.025	8
31.5mm	31.625	0.025	31.100	0.050	12.775	0.025	9
38mm	38.475	0.025	38.075	0.075	16.475	0.025	10
53mm	53.350	0.050	51.700	0	18.500	0	13