Good O-ring to keep thread protector on?

[ARCHIVED THREAD] - Good O-ring to keep thread protector on?

Posted: 9/4/2016 2:38:54 PM EDT

I know I need a good high-heat VITON O ring, but taking a barrel to the local Ace Hardware may draw some looks. Any idea what size I need to go around the base of the threads to sandwich between the barrel and thread protector? Its a 9mm barrel with 1/2x28 threads.

Thanks!

Posted: 9/4/2016 4:42:40 PM EDT

[#1]

Bring the barrel. Most people won't have the slightest clue what it is. I walked in with a raw AR lower and no one noticed.

Posted: 9/4/2016 7:56:36 PM EDT

[#2]

Posted: 9/4/2016 8:17:11 PM EDT

[#3]

Weird. Im considering picking up the threaded CZ P-09 really soon and I was wondering the same exact thing.

So thanks from me, too.

Posted: 9/4/2016 9:37:28 PM EDT

[#4]

Good info,

I have a Silencer Co threaded bbl and find the thread protector loose from time to time.

Posted: 9/4/2016 9:41:37 PM EDT

[#5]

I just found that out myself. Could not keep this thread protector tight for nothing. After asking, I got those pictures posted.

Posted: 9/5/2016 7:21:34 PM EDT

[#6]

CAT O Rings are the best, or that what I have found to be.

Posted: 9/5/2016 9:14:55 PM EDT

[#7]

Quote History

Quoted:
CAT O Rings are the best, or that what I have found to be.

View Quote

Where are you buying those?

Posted: 9/6/2016 10:41:59 AM EDT

[#8]

Quote History

Quoted:

Where are you buying those?

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
CAT O Rings are the best, or that what I have found to be.

Where are you buying those?

Almost any heavy truck dealer, or a Caterpillar dealer, probably online even.

Best bet is link up with a heavy equipment mechanic, they never use all the O-rings in the kit. Every shop I've worked in has had a box of remnants.

Personally I wouldn't bother to seek them unless you need a color to match your shoes

Posted: 9/6/2016 10:52:43 AM EDT

[#9]

Quote History

Quoted:
I just found that out myself. Could not keep this thread protector tight for nothing. After asking, I got those pictures posted.

<a href="http://s35.photobucket.com/user/twpayne75/media/20160902_100943_zpspsvazajc.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160902_100943_zpspsvazajc.jpg</a>

View Quote

I usually don't like modded Glocks but that thing came out nice. Unless I'm mistaken about the model.

Either way looks good.

Posted: 9/6/2016 11:44:37 AM EDT

[#10]

I assume those same o-rings work with the metric threaded 9mm barrels too, right?

Posted: 9/6/2016 12:28:13 PM EDT

[#11]

Quote History

Quoted:

I usually don't like modded Glocks but that thing came out nice. Unless I'm mistaken about the model.

Either way looks good.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I just found that out myself. Could not keep this thread protector tight for nothing. After asking, I got those pictures posted.

<a href="http://s35.photobucket.com/user/twpayne75/media/20160902_100943_zpspsvazajc.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160902_100943_zpspsvazajc.jpg</a>

I usually don't like modded Glocks but that thing came out nice. Unless I'm mistaken about the model.

Either way looks good.

Thanks. Yeah, Glock 19. Pretty happy how it turned out.

Posted: 9/6/2016 2:59:20 PM EDT

[#12]

Quote History

Quoted:
<a href="http://s35.photobucket.com/user/twpayne75/media/FB_IMG_1472867170213_zpsmvwyxa0a.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/FB_IMG_1472867170213_zpsmvwyxa0a.jpg</a>

<a href="http://s35.photobucket.com/user/twpayne75/media/FB_IMG_1472867156117_zpss5wjvnrj.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/FB_IMG_1472867156117_zpss5wjvnrj.jpg</a>

View Quote

5/16ths ID? Did you have to stretch those around the threads?

I just ordered a set of O rings with 12mm ID at the recommendation of some googling, and I dont know WTF they are thinking with these. They are loose around the base, so if you tighten them down reasonably, the O ring rolls over the shoulder of the barrel

So......back to square one, and out 12 bucks with a pack that doesn't work.

Posted: 9/7/2016 12:01:02 AM EDT

[#13]

Quote History

Quoted:

5/16ths ID? Did you have to stretch those around the threads?

I just ordered a set of O rings with 12mm ID at the recommendation of some googling, and I dont know WTF they are thinking with these. They are loose around the base, so if you tighten them down reasonably, the O ring rolls over the shoulder of the barrel

So......back to square one, and out 12 bucks with a pack that doesn't work.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
<a href="http://s35.photobucket.com/user/twpayne75/media/FB_IMG_1472867170213_zpsmvwyxa0a.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/FB_IMG_1472867170213_zpsmvwyxa0a.jpg</a>

<a href="http://s35.photobucket.com/user/twpayne75/media/FB_IMG_1472867156117_zpss5wjvnrj.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/FB_IMG_1472867156117_zpss5wjvnrj.jpg</a>

5/16ths ID? Did you have to stretch those around the threads?

I just ordered a set of O rings with 12mm ID at the recommendation of some googling, and I dont know WTF they are thinking with these. They are loose around the base, so if you tighten them down reasonably, the O ring rolls over the shoulder of the barrel

So......back to square one, and out 12 bucks with a pack that doesn't work.

Will let you know tomorrow. I haven't picked any up yet. That's what was recommended by S3F Solutions.

Posted: 9/7/2016 7:19:37 AM EDT

[#14]

"but taking a barrel to the local Ace Hardware may draw some looks"

I once needed to replace the forearm bolt on a single-shot shotgun. I had no idea what the thread pitch was so I took the whole 30" barrel into Home Depot and started sorting through their bolt bins. A HD Associate came over and asked me if I needed any help;

HD: Sir, can I help you?
me: No, thank you.
HD: Is..Is that a gun?
me: No
HD: OK, let me know if you need any help.

Posted: 9/7/2016 11:43:55 AM EDT

[#15]

Id be surprised if anyone there even knows what a handgun barrel looks like outside of a gun. Anyone who knows what it is by looking at it probably wouldnt care that you brought it in.

Posted: 9/8/2016 2:57:10 PM EDT

[#16]

Just bought a few of the size I posted above.

They are perfect. You do need to stretch them slightly over the threads.

Posted: 9/8/2016 5:09:49 PM EDT

[#17]

Arent those Danco ones just rubber? Isnt there a chance of them melting or something?

Posted: 9/8/2016 5:54:13 PM EDT

[#18]

Quote History

Quoted:
Arent those Danco ones just rubber? Isnt there a chance of them melting or something?

View Quote

I guess it's possible, but it would take a lot of rounds quickly. Rubber doesn't melt that quick.

A couple days ago i was experimenting with a 15#, 18#, and 20# spring. I kept switching between the springs and the barrel never got hot. Shot a couple hundred rounds.

Have mine on now. Will be shooting in the next couple days. Will let you know how it goes. If I have to replace every range visit, I'm fine with it. Think I paid 25 cents for them.

Posted: 9/8/2016 7:27:36 PM EDT

[#19]

I'm going to go to menards or home depot with a barrel and locate a viton o ring that has the desired fit. I will report back so we have a definitive answer as to what size works, and where to buy.

Posted: 9/8/2016 8:21:04 PM EDT

[#20]

Quote History

Quoted:
I'm going to go to menards or home depot with a barrel and locate a viton o ring that has the desired fit. I will report back so we have a definitive answer as to what size works, and where to buy.

View Quote

The above is the recommended size by S3F Solutions. You may be able to find better quality. I just stopped in the local hardware of the town I happen to be in.

Posted: 9/8/2016 9:54:26 PM EDT

[#21]

Quote History

Quoted:

The above is the recommended size by S3F Solutions. You may be able to find better quality. I just stopped in the local hardware of the town I happen to be in.

<a href="http://s35.photobucket.com/user/twpayne75/media/20160908_202416_zpstqrvpnma.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160908_202416_zpstqrvpnma.jpg</a>

<a href="http://s35.photobucket.com/user/twpayne75/media/20160908_202319_zpssi2omtp2.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160908_202319_zpssi2omtp2.jpg</a>

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I'm going to go to menards or home depot with a barrel and locate a viton o ring that has the desired fit. I will report back so we have a definitive answer as to what size works, and where to buy.

The above is the recommended size by S3F Solutions. You may be able to find better quality. I just stopped in the local hardware of the town I happen to be in.

<a href="http://s35.photobucket.com/user/twpayne75/media/20160908_202416_zpstqrvpnma.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160908_202416_zpstqrvpnma.jpg</a>

<a href="http://s35.photobucket.com/user/twpayne75/media/20160908_202319_zpssi2omtp2.jpg.html" target="_blank">http://i35.photobucket.com/albums/d155/twpayne75/20160908_202319_zpssi2omtp2.jpg</a>

Goal is to find a viton equivalent!

Posted: 9/8/2016 11:03:09 PM EDT

[#22]

McMaster-Carr has them here pretty cheap.

ETA - The size in the earlier post on this site is dash number 011.

Posted: 9/8/2016 11:51:40 PM EDT

[#23]

Quote History

Quoted:
I assume those same o-rings work with the metric threaded 9mm barrels too, right?

View Quote

Posted: 9/8/2016 11:58:17 PM EDT

[#24]

Quote History

Quoted:
McMaster-Carr has them here pretty cheap.

ETA - The size in the earlier post on this site is dash number 011.

View Quote

Any chance of a direct link? That website is hellacious on a mobile device....

Posted: 9/16/2016 3:23:53 PM EDT

[#25]

Quote History

Quoted:

http://i67.tinypic.com/350vsqf.jpg

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:

I assume those same o-rings work with the metric threaded 9mm barrels too, right?

http://i67.tinypic.com/350vsqf.jpg

Yes. Serious. 13mm (used for metric threaded 9mm barrels) is slightly larger than 1/2" (used for standard threaded 9mm barrels). I just wasn't sure if it is enough difference to matter. I have both standard and metric threaded barrels, so it was worth asking before ordering some o-rings.

Posted: 9/16/2016 4:05:39 PM EDT

[#26]

Quote History

Quoted:

Yes. Serious. 13mm (used for metric threaded 9mm barrels) is slightly larger than 1/2" (used for standard threaded 9mm barrels). I just wasn't sure if it is enough difference to matter. I have both standard and metric threaded barrels, so it was worth asking before ordering some o-rings.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I assume those same o-rings work with the metric threaded 9mm barrels too, right?

http://i67.tinypic.com/350vsqf.jpg

Yes. Serious. 13mm (used for metric threaded 9mm barrels) is slightly larger than 1/2" (used for standard threaded 9mm barrels). I just wasn't sure if it is enough difference to matter. I have both standard and metric threaded barrels, so it was worth asking before ordering some o-rings.

Should work fine. Reason being, if your o ring isn't a "tight" fit over the threads, it won't sit well on the shoulder, and will slip over it as you tighten. Hence why I'm bummed I listened to some random internet link I scrounged up before confirming here and have 50 o rings that I can't use for anything now.

Posted: 9/16/2016 6:28:11 PM EDT

[#27]

Quote History

Quoted:

Should work fine. Reason being, if your o ring isn't a "tight" fit over the threads, it won't sit well on the shoulder, and will slip over it as you tighten. Hence why I'm bummed I listened to some random internet link I scrounged up before confirming here and have 50 o rings that I can't use for anything now.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I assume those same o-rings work with the metric threaded 9mm barrels too, right?

http://i67.tinypic.com/350vsqf.jpg

Yes. Serious. 13mm (used for metric threaded 9mm barrels) is slightly larger than 1/2" (used for standard threaded 9mm barrels). I just wasn't sure if it is enough difference to matter. I have both standard and metric threaded barrels, so it was worth asking before ordering some o-rings.

Should work fine. Reason being, if your o ring isn't a "tight" fit over the threads, it won't sit well on the shoulder, and will slip over it as you tighten. Hence why I'm bummed I listened to some random internet link I scrounged up before confirming here and have 50 o rings that I can't use for anything now.

Go to a decent hardware store and purchase ONE.
If you really need a pile THEN order the correct size.

Saving pennies can cost you dollars.

Posted: 9/16/2016 7:22:21 PM EDT

[#28]

That's what I put on my CZ 85 with the threaded barrel. 7/16" X 5/16" X 1/16". Worked like a charm.

Posted: 9/16/2016 11:00:22 PM EDT

[#29]

Quote History

Quoted:

Any chance of a direct link? That website is hellacious on a mobile device....

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
McMaster-Carr has them here pretty cheap.

ETA - The size in the earlier post on this site is dash number 011.

Any chance of a direct link? That website is hellacious on a mobile device....

9464K16 is their part number for Viton 5/16 x 7/16 x 1/16 o-rings $6 and change for a 100.

If you have a caliper, measure where it will set, that will be your ID.if you think 5/16ths is the wrong size.

Posted: 9/17/2016 1:02:06 PM EDT

[#30]

I had a new ME working his first job job that did not understand sealing rings need grooves in at least one side (and sometime both).

He was gone before his first year was completed.

He made further errors on other jobs.

Posted: 9/18/2016 12:16:57 PM EDT

[#31]

I've been snooping around this topic ever since I started building AR-10s and working around a lot of people with cans and thread protectors.

As far as O-rings go, it seems that Viton V75, Viton Extreme ETP or Fluorosilicone 70D materials are your best bets. I am NOT a chemist by any stretch BUT all of these are made from fluoropolymer compounds. Fluoropolymers are about as good as you can get on the open market, that I personally know of, that can handle oils, solvents AND "high temps". But if you get your barrel glowing....all bets are off.

Here's another thing that I do with thread protectors, speaking of Florine based compounds. I use PTFE thread tape ( like plumbers sealing tape ) to FILL ( not completely, obviously ) the sectional VOLUME of the mating threads. This keeps ( or helps keep ) the threads from vibrating loose or backing out quickly ( at least ) under repeated firing, heating and cooling.

Posted: 9/18/2016 1:59:46 PM EDT

[#32]

Quote History

Quoted:

9464K16 is their part number for Viton 5/16 x 7/16 x 1/16 o-rings $6 and change for a 100.

If you have a caliper, measure where it will set, that will be your ID.if you think 5/16ths is the wrong size.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
McMaster-Carr has them here pretty cheap.

ETA - The size in the earlier post on this site is dash number 011.

Any chance of a direct link? That website is hellacious on a mobile device....

9464K16 is their part number for Viton 5/16 x 7/16 x 1/16 o-rings $6 and change for a 100.

If you have a caliper, measure where it will set, that will be your ID.if you think 5/16ths is the wrong size.

Thank you! Ordered some today. Went and grabbed some Danco ones to test them out, and the size seems perfect. Snug, but not too tight and there is no chance of the o ring rolling over the shoulder.

Posted: 9/23/2016 5:05:36 PM EDT

[#33]

Thanks for this thread - I ordered a set for my 9mm barrels and it took some doing (and 3 ruined rings

) but I finally figured out how to get it on correctly, even on a SIG metric barrel. I wound up using a non-marring punch to sort of lever the ring over once I got it started on the opposite side.

Anyone got a proper size for .45acp barrels?

Posted: 9/26/2016 12:41:25 PM EDT

[#34]

Quote History

Quoted:

Anyone got a proper size for .45acp barrels?

View Quote

This.

Posted: 9/27/2016 7:14:09 PM EDT

[#35]

I'm down for half a box (50) or quarter box (25) of those McMaster-carr Viton 9464K16, if someone wants to split one up.

Posted: 9/27/2016 7:37:53 PM EDT

[#36]

I ordered some from McMaster yesterday, but I havent been charged yet. I got the confirmation, just not charged.
Does anyone who has ordered from them have any input on how long they usually take? Im going up north and Im taking my P-09, so Id like to know if Ill have the rings before then.

Posted: 9/27/2016 8:07:34 PM EDT

[#37]

Quote History

Quoted:
I ordered some from McMaster yesterday, but I havent been charged yet. I got the confirmation, just not charged.
Does anyone who has ordered from them have any input on how long they usually take? Im going up north and Im taking my P-09, so Id like to know if Ill have the rings before then.

View Quote

Mine shipped within a day or so, and I had them a few days from there. They actually showed up a day sooner than the estimate said. You'll get them as fast as anything else you order online.

Posted: 9/28/2016 7:36:02 PM EDT

[#38]

Quote History

Quoted:

Mine shipped within a day or so, and I had them a few days from there. They actually showed up a day sooner than the estimate said. You'll get them as fast as anything else you order online.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I ordered some from McMaster yesterday, but I havent been charged yet. I got the confirmation, just not charged.
Does anyone who has ordered from them have any input on how long they usually take? Im going up north and Im taking my P-09, so Id like to know if Ill have the rings before then.

Mine shipped within a day or so, and I had them a few days from there. They actually showed up a day sooner than the estimate said. You'll get them as fast as anything else you order online.

Yeah, they charged me last night, then they delivered today. Weird.

Posted: 9/29/2016 3:08:34 PM EDT

[#39]

If you have a caliper, measure where it will set, that will be your ID.if you think 5/16ths is the wrong size.

View Quote

ME cheat sheet says at least 10% elongation.

Make the ring smaller than the direct measurement.

Posted: 10/1/2016 12:12:41 AM EDT

[#40]

Quote History

Quoted:

ME cheat sheet says at least 10% elongation.

Make the ring smaller than the direct measurement.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

If you have a caliper, measure where it will set, that will be your ID.if you think 5/16ths is the wrong size.

ME cheat sheet says at least 10% elongation.

Make the ring smaller than the direct measurement.

You are correct, you want a snug/tight fit.(My bad on caliper comment)
9 mm = 0.3543 and that's not including the barrel wall thickness X's 2.
5/16 ths = 0.3125

For those asking about .45 , I'm guessing a 7/16 X 9/16 x 1/16 would probably be a good starting point.

Posted: 10/1/2016 7:02:44 AM EDT

[#41]

That sounds about right...I'll order a bag of 50 and see.

Worst case, I can use them as temporary engagement rings for a weekend.

Posted: 10/9/2016 2:15:58 AM EDT

[#42]

So, Im not making any accusations, but I thought this was interesting...

I ordered some O-rings on Sept. 29th (EDIT: Actually, it was a couple days earlier, 29th is when I was charged) from McMaster-Carr, which is based in IL, and just now I got a charge on my debit card, which I used to order the rings, at a RedBox in IL (Im in Michigan). The location of the Red Box is like 20 minutes away from McMaster-Carr.

Strange.
I barely use my debit card too. That order is the only online order Ive used it for in a very long time. All the other charges are businesses in my area. I seriously only use the card at drive-thrus. Other than that the account is used to pay bills.

Like I said, Im not accusing them... but I think its a strange coincidence. I never use the card online, then I use it to buy from them, then less than 2 weeks later its being used at a location 20 minutes away from them.

Watch your accounts.