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Gauntlet Pellet Probe O-ring Size?

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PumaCarl

PumaCarl

Member
Sep 17, 2017
996
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NH, United States
I have a .22 Gauntlet and need some new o-rings for the pellet probe so I just called Umarex and asked what size they were. I was told that they were not told and didn't have that information available but they could sell sell me them at $2.75 a piece. I laughed out loud, said 'thankyou no, there was no way that I am paying that, I will figure it out for myself.'

I will figure it out for myself. That seems to be how most of this sport goes anyway. I just thought that I would share this as there was a thread about which airgun companies were user serviceable friendly. Just giving the size would be friendly, this way is extortion. They are, at least, friendly on the phone though.
 
I emailed umarex to get a new air stripper, as mine was cracked when I receved it from P.M.A. they got right back to me and sent it out free kine shipping and all.
My sear spring broke right after that so I hit them up again and havent receved a reply back 9 days later. Ill try them again tonight. Seems odd that I would get such good service one day, and 3 days later nothing.
 
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 It is a strange thing, Umarex Customer Servive, because I have heard of them shipping out things free of any charge one time and charging another. My air stripper was cracked intially and I called them and they shipped one right out but when it arrived I had to pay for the shipping. No rhyme or reason. ​I have the Harbor Freight kits, SAE and Metric and none of them are the correct size. I wish it were that easy.I am not paying more than a buck an o-ring with shipping and once I find out the correct size, everyone is going to hear about it. This stuff is nonsense! There should be a specs. section on this forum where each air rifle gets its own thread and people can put in all the specifications they have or want; especially for the oft damaged o-rings.
 
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Update: I have been trying to measure the tiny beat up little o-ring accurately and it is quite a challenge. I finally decided to order both a fractional size and a metric size closest to what I have, from McMaster-Carr in a 90 dura. The numbers I ordered were 1247N128 and 5308T113. They come by the hundred count and two hundred cost me $5.61 plus standard shipping. Basically the same thing "2" o-rings from Umarex was going to cost me. I will update again when I determine which actually fits better in the gun.
 
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I have been successful with model N1.50X002 1.5MM X 2MM Buna 70 rings from the O-Ring Store on line.

Shipping may cost you a little but you can buy a quantity of them that will last a long time.

You can also try 1.5MM X 2.21MM N1.50X002.21 They may be a little large but I was able to turn them down a fraction using a rotating wheel with the ring on a free spinning shaft.
 
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Update: I received the the o-rings from McMaster-Carr that I ordered as listed above and of course they were wrong. The metric size was too small and the fractional size was too big but still a better fit than the metric. I just ordered the fractional size with a dash number of 003 (as opposed to the 004 that I got), which looks like it should be the correct size going between these two. The McMaster-Carr number is 5308T112.
 
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The Saga continues....

Update: the 003 size from M-C are smaller than their printed dimension would suggest.

Springrrr, the first metric size that I tried was 1.5x2 and they were too small. I am not interested in having to turn any down to fit so I am going to try find a 1.5x2.1. Maybe I am having problems because I want a 90 dura, or M-C's o-rings are dimensionally different than other suppliers, I don't know, but I am on this like a puppy on a sock now.
 
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I hope this helps, I do not take credit in this post and info, since it was published in other forums before, I only took the liberty to summarize the info here,
See the first pic with the schematic drawings for the Gauntlet with each part number and designation, the second pic has a full list of all the O'rings for the gun, both in .177 and .22
PumaCarl, hope it helps to solve the issue, best to all.

1524704800_8560907035ae12620450046.00850367_Gauntlet Schematics.png


1524704861_11857574995ae1265d375157.31928463_Gauntlet O-Rings.jpg


Alejandro
 
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Thanks for the chart.

Depending on "sloppy fit" one might not need to worry ( depending ) , and, a softer oring might be okay sometimes. 
The factory Gauntlet orings are a loose fit on the wide slot on the bolt and seem to seal very well. It appears they count on the air blast causing a momentary seal, just like the loading breach on a 909 with the brass slide covering. On those with the barrel removed & one end sealed you can blow through the seals with lung pressure but when hit with high pas it seals well enough it wont disturb talk powder.

For sealing a bolt/probe I would not go as hard as possible but if thats what you want maybe call mac1 his seals are SO hard you can hold them in your fingers and sand the down,
I replaced a few of those ( hard seals) on B50 which cured the aliments the hard orings caused- stiff closing w/air leak. Even tho each design is different it is worth thinking/experimenting a bit.

I've been using some black soft ace hardware oring in mine ffor several 1,000's of shots now.

John
 
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Final Update: (by me anyway!)

Per Alejandroo's chart, the exact replacement o-ring can be found here: http://www.callapg.com/v75004

FKM makes it a Viton o-ring, not a Buna. The funny thing is that I am not even going to bother ordering these for now because I have already spent so much on shipping for all the wrong sizes. I never wanted the original size anyway, I wanted a better, and more durable, fit. I don't really see that happening now that I have ordered all the sizes (plus and minus) around the original and find them all to be lacking. I will more than likely just use Buna 70's because they are a lot easier to put on, even if they fail more often, I've got plenty.
 
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A question from this new guy about the Gauntlet "O" ring discussion. . . on wear.

Do you guys lube those O rings from time to time with a silicon grease to keep wear to a minimum..??

PS: Silicon grease can be found cheap in pressurized cans at electrical stores, web sources, etc. (e.g) CRC Di-Electric grease. . is one trade brand.
Click to expand...


Don't use dielectric grease. It is known to melt silicone-based rubber over time. Instead, use silicone grease or paste.

http://www.tech-faq.com/dielectric-grease.html

https://www.ipdusa.com/products/6706/114923-dielectric-grease

If you don't want to believe it is an issue ask any old time mechanic who pulled apart the fender mounted electronic module connections on a Ford after a few years. They crumble.

Another example is the pickup coil to module connections on the Ford Escort where the module was mounted on the side of the distributor. When the module went bad the rubber connection on the pickup coil disintegrated. The replacement part used a hard plastic connection.

Both of these examples are examples of high heat situations, but better safe than sorry.


 
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The .177 probe seal ID, OD and wire size numbers don't add up correctly so you might check your numbers. Everything else looks OK.



I hope this helps, I do not take credit in this post and info, since it was published in other forums before, I only took the liberty to summarize the info here, See the first pic with the schematic drawings for the Gauntlet with each part number and designation, the second pic has a full list of all the O'rings for the gun, both in .177 and .22 PumaCarl, hope it helps to solve the issue, best to all.
1524704800_8560907035ae12620450046.00850367_Gauntlet Schematics.png
1524704861_11857574995ae1265d375157.31928463_Gauntlet O-Rings.jpg
Alejandro
Click to expand...


 
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