Question QCS Rolock 90 Leak

[beldridg]

Every time I used to use lubricant of any type, it made the ring rotate when I went to put on the glove. That might have been when I had the o-rings that made it really hard to lock in the glove so it would torque it and force it to rotate out of place.

I'll have to try it again with some lubricant when I have some time and dives that I don't care if I miss.

- brett

 

[Badger7]

Every time I used to use lubricant of any type, it made the ring rotate when I went to put on the glove. That might have been when I had the o-rings that made it really hard to lock in the glove so it would torque it and force it to rotate out of place.

I'll have to try it again with some lubricant when I have some time and dives that I don't care if I miss.

- brett

I think you'll find water-based lube dries out pretty quick and the ring in the suit won't budge, that was my experience at least. I still need to carefully use a plastic bicycle tire lever to remove the rings from the suit.

 

[mr_v]

Every time I used to use lubricant of any type, it made the ring rotate when I went to put on the glove. That might have been when I had the o-rings that made it really hard to lock in the glove so it would torque it and force it to rotate out of place.

I'll have to try it again with some lubricant when I have some time and dives that I don't care if I miss.

- brett

Yesterday I applied water+dawn solution to the seal and noticed that the suit-side ring rotated when I tried to put on the glove. It was beneficial, as I rotated the ring into a proper position after messing up the alignment. By the time I got home, the suit-side ring did not rotate at all.

 

[mr_v]

Well, first leak is sealed. I don't think the factory sat the wrist seal the best way. Now, I am dealing with a minor glove leak. Sounds like I will have to replace the o-ring.

 

[mr_v]

You can order these View attachment 909832
I bought 2 packs of 5, have been using one for a while and works perfectly

I just installed these o-rings and the gloves fit a bit too loose. May be not 'loose' but easy on, easy off. Are these for Rolock 90?

 

[lexvil]

I just installed these o-rings and the gloves fit a bit too loose. May be not 'loose' but easy on, easy off. Are these for Rolock 90?

Seem to be the right size, I’ve been using the one I installed since whenever I posted that, (March) no leaks.

 

[mr_v]

when I use the same o-ring, I can easily rotate the glove and I think it may pop out...

 

[lexvil]

when I use the same o-ring, I can easily rotate the glove and I think it may pop out...

The glove or the lock assembly, the suit side and glove side or are you talking about the oring that locks the glove into the outer ring?

 

[mr_v]

The oring that locks the glove into the outer ring?

The o-ring that is installed on the suit side, with its face exposed to the glove. I am a bit under the weather, will take pics and possibly a video to show what's up. I believe this is the product as advertised on Rolock site:

O-rings for bayonet lock (from 2006) – Rolock

www.rolock.ch

Looking at the related thread, it does appear that the 96x2.5 o-ring suggested by the Rolock on their site is smaller and thinner than the original. I will update this thread with more info shortly.

A

Thread 'Rolock 90 o-rings - another post'

Mar 3, 2025

Hi, have had the Rolock 90 system for several months (~20 dives) with no issues and appreciate the bayonet and twist locking. Thought I should add some spare o-rings to the save-a-dive kit as although I lightly lube the mating o-ring, our dive sites are often silty sandy with some abrasion. Through the forum and discussion on Rolock 90 o-rings and looking at the Rolock website, ( O-rings for bayonet lock (from 2006) – Rolock ) I sourced and purchased the O-Ring: Buna-N, Round, 2.5 mm C.S., 96 mm I.D.
My query is that the o-rings at 96mm I.D. appear to be smaller than the...

• Apteryx54
• Replies: 6
• Forum: Exposure Suits

• 

If you watch this you tube video between 12:50 - 13:10, you will see how the person applies some pressure to lock the gloves. With 96x2.5 o-rings, I need absolutely zero force.

 

[mr_v]

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: