Folks, there is no way the Rolock 90 o-rings are 96mm x 2.5mm (ID x CS) for my gloves due to wrong cross section and inner diameter sizes. FYI, I have the newer, updated Rolock 90 system that uses painted arrows as opposed to dimples for the orientation.
According to calibrated Mitutoyo digital calipers:
- The inner diameter of the ring grove on the bayonet is 103.44mm.
- The original o-ring cross section is 2.62mm.
I measured the cross section by fitting the calipers against the ring as tight as I could and the scale read 2.59mm. Once I moved the scale to 2.61mm the ring started slipping out and fell. In any case, 2.62mm is the standard o-ring diameter.
According to Parker, static rings can be stretched up to 3% without losing enough cross-section width to not seal. Thus, 98.88mm is the largest diameter grove suitable for a 96mm ID o-ring (96 x 1.03 = 98.88).
Here is the problem: it is hard to source 2.62mm o-rings. So one can try 2.5mm but in this case you won't have any room for stretching out the cross-section, so you need to get 104mm o-rings.
And here is the pic that says it all. The outer o-ring is the one I pulled from my Rolock 90. The inner o-ring is the 2.5mm x 96mm:
View attachment 915076
