Need someone to tap a 10-40 thread
- Thread starter 88 man
- Start date
Positive on the size? Reason I ask, is that most of the gun makers were not too shy about using odd ball sizes of threads that were not exactly to any particular standard. Lots of oddball decimal measurement diameters out there, and lots of really funky thread pitches, like Winchester using 36 & 1/2 TPI.
If you are positive, you are best off to order a tap and do it yourself.
A 40 threads per inch Number 10 diameter tap is not a commonly stocked item at most hardware stores, as it is finer than the National Standard Fine thread pitch. This makes it either a NEF or NS thread (Extra Fine, or Special, which is the catchall for all the ones that are not listed otherwise in the tables), under the working theory that the thread is a 60 degree National Thread Form.
Anyways, you can order special taps through pretty much any outfit that supplies tools to the Machine Shops or similar industries. A search should find you a couple nearby. I have had good results in my dealings with KBC Tools, Thomas Skinner and Sons, and a few others. There are custom tool grinding shops that will make a tap to order if they do not have them, too. Usually listed under the same suppliers lists that the tool sales places are if you are using a phone book or business directory. Search Machine tool cutter supplier, or custom cutter grinding, and shop around. Like as not, you will get a tap delivered for less than you will spend on postage to get a borrowed tap round trip.
Cheers
Trev
If you are positive, you are best off to order a tap and do it yourself.
A 40 threads per inch Number 10 diameter tap is not a commonly stocked item at most hardware stores, as it is finer than the National Standard Fine thread pitch. This makes it either a NEF or NS thread (Extra Fine, or Special, which is the catchall for all the ones that are not listed otherwise in the tables), under the working theory that the thread is a 60 degree National Thread Form.
Anyways, you can order special taps through pretty much any outfit that supplies tools to the Machine Shops or similar industries. A search should find you a couple nearby. I have had good results in my dealings with KBC Tools, Thomas Skinner and Sons, and a few others. There are custom tool grinding shops that will make a tap to order if they do not have them, too. Usually listed under the same suppliers lists that the tool sales places are if you are using a phone book or business directory. Search Machine tool cutter supplier, or custom cutter grinding, and shop around. Like as not, you will get a tap delivered for less than you will spend on postage to get a borrowed tap round trip.
Cheers
Trev
I figured it'd be an oddball ! Found a few on ebay for about $6 including shipping so might go that way and still not have much into it as I'll never use it again ! I just don't know how to tell degree of threads or anything other than I was told it was 10-40 and don't want to order the wrong tap
The screw that goes through the mag tube cap and into the hanger was the only screw missing from the rifle when I got it and I found one but it's a little too long plus the hanger has 2 dif thread sizes in it.The top half is 10-40 and bottom half is 8-40.I'm thinking it should've been 8-40 all the way through to start with and threads got stripped and someone yrs ago just tapped part way down.
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I've had a wtb lots of times and nothing.Found a tap for $6 shipped so bought that so hopefully that'll fix it and if not I'm not out much.Our smith here says he's too busy for little jobs like this plus says he doesn't have a tap that size or a 8-40 to put a bushing in as already asked that q.
