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Posted: 6/28/2011 10:44:46 AM EDT
| Does anyone have a good link or summary on the various thread specs and what calibers they typically serve? I know some manufacturers use different TPI, right/left and what not to break any standardization but any guidance is appreciated. I ask this as I'm trying to figure out if the 9/16X24 that usually accomodates the 40S&W would also accomodate the 300 Blackout which is listed as needing 5/8X24. The 9/16 is almost a 5/8 and certainly could be the same if there is some rounding (in name only). If it's not the same then I don't know how AAC Tirants are being fitted to the 300 Blackout as there is no 5/8X24 piston available to my knowledge. Thanks! |
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I know a good bit about threads. So do a lot of guys on this site. But it sounds like your specific question is how are people sticking their TiRant on a 300BO host that has 5/8x24 threads. Right? Does your dealer not know? I'd suggest contacting Mers or Holister at AAC and they should be able to best direct you.
As to 9/16x24 and 5/8x24, they are "close" as you stated but different. You should have properly matching threads between your host and suppressor. I know AAC has made some "semi-custom" pistons for some TiRants. While they don't have a 5/8x24 TiRant piston listed on their website I wouldn't be surprised if they had made some. In short... Contact AAC. 
Mark |
| Thanks guys! I haven't found the pdf yet, but I'll be checking the site in more detail soon. Just like cartridge nomenclature it seems the industry has done of good job straying from simplicity and standarization. I haven't been able to talk to any at AAC yet either. |
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Most 30cal guns are 5/8-24. Exception would be 1990s Colts in 7.62x39, Model 1 Sales barrels. 1/2-36.
6.5 Grendel is most often 9/16-24, however some of them are 3/4-28, which I think matches better with 338LM weapons. Some 6.8 barrels are 5/8-24 and some are 1/2-36. Wilson Combat uses 5/8-24 because there's no reason to have a threading that eats up too much barrel and a 30cal muzzle device will work perfectly. It would be great if Grendel barrels also used 5/8-24 instead of 9/16-24 or 3/4-28. 1/2-28 for 223/556/22 uppers If you have a 5/8-24 device/can, do not try to put it on a 9/16-24. Recipe for disaster. |
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Quoted:
1/2-28 for 223/556/22 uppers Just some more fun, random thread stuff.... While this is correct for pitch, tenon length is typically different. For example, many .22lr suppressors are cut for tenon length of .400" to .450" while a typical 5.56 barrel would have .600" to .650" tenon length. The result can be that if you screw a .22lr suppressor on a barrel with a longer tenon length, the exposed barrel threads INSIDE the suppressor can become caked with fouling and maybe even some lead. If the buildup is too much, threads could be damaged trying to remove the suppressor. TPI isn't the only thing people need to consider when mounting a device on a barrel. 
Mark |
| Good info guys. Seems like there's plenty of oppurtunity here to purchase the wrong items and/or cause damage. Most industries I've worked in are forced to standardize to reduce liabilities and keep costs down. I can understand some manufacturers wanting propietary stuff, I'm just a bit suprised that an industry that tends to unjustly persecuted by polticians and media has so much deviation that some calibers do not have an undisputed normal spec, every cal seems to certainly have exceptions, and there is little rhyme or reason. Is it took much to ask for a sticky, once a good reference guide is found or composed? |
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Quoted:
Quoted:
1/2-28 for 223/556/22 uppers Just some more fun, random thread stuff.... While this is correct for pitch, tenon length is typically different. For example, many .22lr suppressors are cut for tenon length of .400" to .450" while a typical 5.56 barrel would have .600" to .650" tenon length. The result can be that if you screw a .22lr suppressor on a barrel with a longer tenon length, the exposed barrel threads INSIDE the suppressor can become caked with fouling and maybe even some lead. If the buildup is too much, threads could be damaged trying to remove the suppressor. TPI isn't the only thing people need to consider when mounting a device on a barrel.
Mark 1/2"x28 is also used for 9mm. Would suck to put a .22lr can on a 9mm pistol. |
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Of the significant number of barrel sources above 5.56 and below .338 Lapua I wish they'd all put 5/8-24 threads. Why? Because a 30 caliber can works perfectly on your 762x51, 762x39, 762x25, 6.8spc, 6.5 Grendel, 6x45.....basically YHM says if it fits through it shoot it.
I just had to wait a while to get a 9/16-24 YHM QD mount for my 6.5 Grendel but the wait was worth it. I'm still needing to get a good scope mount for the Leupold going on it. When Wilson Combat uses 5/8-24 on their 6.8s because they know that a 30cal device will likely go onto that gun. Can we get a no-nonsense approach to this? |
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