Posted: 2/6/2016 11:42:34 PM EDT
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*I also posted this on the Armory-Gunsmithing section*
I just received a drop-on barrel that I custom ordered for my Savage 110, obviously my first time doing this. I took off the old barrel, and when I put the barrel nut on the new barrel, it seemed to go on somewhat hard. It went on by hand, but just a little hard. When I went to add the recoil lug, it wouldn't go on. I tried gently threading on the action...no go. I measured the thread diameter of the new barrel, and it was 1.064 or so. I measured the old barrel...1.055 or so. At this point, I was thinking that I ordered the large shank rather than the small shank. Nope, my order stated small shank. At this point, I was thinking that they mistakenly made the large shank for me. Nope...this is the confusing part. The vendor's website states 1 1/6" for small shank, and 1 1/8" for large shank. I have not contacted the vendor to ask them, so I would rather leave their name out until they have a chance to make things right. Here is my question: I thought that "small shank" was 1.055" and "large shank" was 1.65 (1 1/16"). Can somebody help me, please? |
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1 1/16" is 1.0625" in decimal.
That typically describes the maximum diameter of the male thread, but more commonly that major diameter is a few thousandths smaller than the actual call out. There are classifications (1A, 2A, 3A, and 1B, 2B, 3B for male/female threads) that give the exact specifications and tolerances of each standard size/pitch thread. Do the tops of the "hills" on your threads come to a sharp point, or is there a small flat surface? @1.064", you're over spec regardless. The fix could be as simple as taking a .002-.003" pass on the crests of the threads (that are now digging into the root of your female threads on the receiver), or as complicated as picking up the existing threads and cutting them a little deeper to get an acceptable pitch diameter. At any rate, a phone call to whoever spun up the barrel will likely prove to be the best solution to your problem. |
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Quoted: Might just grab some 600 grit wet/dry sandpaper and run the sharp edges off the threads on the barrel tenon. I've had a couple that were like that and that took care of it. Gave a nice snug fit everywhere. Bruce |