Question QCS Rolock 90 Leak

[lexvil]

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

They work on mine but I do have older 90’s, you should contact RoLock directly and obtain a spare set from them.

 

[mr_v]

Yes, it seems like you have a different set of gloves. I can tell you that 2.5mm (CS) x 105mm (ID) ring works well with Rolock 90. The original ring is 2.62mm CS but I think it is way too thick for smooth donning on/off.

 

[lexvil]

The Rolock site doesn’t mention anything new since 2006

Pre 2006 were 90x2mm

 

[mr_v]

Well, their site is then not compatible with at least four rings - two for me and two for another member. I've spent way too much time measuring o-rings for various applications and can tell you that o-rings which came with my system are 2.62mm. The suit is 2 months old. Also, note the text says "Rolock standard." I have no idea whether Rolock 90 is standard or if there is something else.

I threw away 2.5mm x 96mm o-rings because I did not want one to get into my dry bag by accident. But 2.5mm ring did not hold due to stretch. I'll take a video of what 2.5mm x 105 is like. Better.

 

[lexvil]

The Rolock site is weak at best, I went with their size recommendation and it works but I don’t know if they have updated their site in years but it doesn’t look that way

Link

Products – Rolock

www.rolock.ch