Lead-in chamfers and radii

Shaft diameter				Diameter difference		Radii
						Seal without		Seal with
Nominal						auxiliary lip		auxiliary lip
d1				d1 - d2		r		r
over	incl.	over	incl.	min		min		min
mm		in.		mm	in.	mm	in.	mm	in.
	10		0.394	1,5	0.059	0,6	0.024	1	0.039
10	20	0.394	0.787	2	0.079	0,6	0.024	1	0.039
20	30	0.787	1.181	2,5	0.098	0,6	0.024	1	0.039
30	40	1.181	1.575	3	0.118	0,6	0.024	1	0.039
40	50	1.575	1.968	3,5	0.138	0,6	0.024	1	0.039
50	70	1.968	2.756	4	0.157	0,6	0.024	1	0.039
70	95	2.756	3.740	4,5	0.177	0,6	0.024	1	0.039
95	130	3.740	5.118	5,5	0.216	1	0.039	2	0.079
130	240	5.118	9.449	7	0.276	1	0.039	2	0.079
240	500	9.449	19.658	11	0.433	2	0.079	3	0.118
500		19.685		13	0.512	5	0.197	5	0.197

If the corner is blended rather than chamfered, the blended section should not be smaller than the difference in diameters d₁ - d₂.