Inoxia stocks O rings in 13 sizes, which are rolled and welded 316 stainless steel.

Specifications

ID (mm)	Thickness (mm)	OD (mm)
20	3	26
25	3	31
30	3	36
35	4	43
40	4	48
45	4	53
50	4	58
55	4	63
60	4	68
65	4	73
70	4	80
75	4	83
94	3	100

* 99% of rings -0mm / +1mm. Lower tolerance for 94mm ID rings.

ID - (Inner Diameter)

OD - (Outer Diameter)