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- Thread starter gunsdora
- Start date
There are some overall size variations available in threads. Some have a tighter tolerance than others, cheap bolt = loose fit most times. Can you try another bolt or take it to a machine shop and have them check out your threaded hole to make sure its 10-32.
The possibility is that its a 12-32 thread.
The possibility is that its a 12-32 thread.
- Location
- Manitoulin Island
Generally speaking socket head capscrews or setscrews are more accurate sizes than the cheap screws in a box. The cheapo ones are cut sloppy.
Make and model? Factory or done by someone, post production? Where on the gun, for what purpose?
Esp. if the holes were installed by use of hand taps by someone not entirely sure of what they were doing, the holes could well be wallowed out a bit.
Aside from the issue of tolerances and varying qualities of screws, at varying price points (as in, you ain't getting much for your money at CTire or the big box stores!), there is always the possibility that if it is a factory thread, that they simply made an oddball size to keep you captive as a buyer of parts. It runs the gamut.
Your options may be that it is perfectly fine, and you need to adjust your expectations, all the way up to that you need to have a custom screw made and finished. Sorta all hinges around what it is and what it does.
Non-permanent thread retainer is yer friend, eh?
Cheers
Trev
Esp. if the holes were installed by use of hand taps by someone not entirely sure of what they were doing, the holes could well be wallowed out a bit.
Aside from the issue of tolerances and varying qualities of screws, at varying price points (as in, you ain't getting much for your money at CTire or the big box stores!), there is always the possibility that if it is a factory thread, that they simply made an oddball size to keep you captive as a buyer of parts. It runs the gamut.
Your options may be that it is perfectly fine, and you need to adjust your expectations, all the way up to that you need to have a custom screw made and finished. Sorta all hinges around what it is and what it does.
Non-permanent thread retainer is yer friend, eh?
Cheers
Trev
Blastattack
CGN Ultra frequent flyer
- Location
- Winnipeg MB
There is your problem. You want to get yourself some genuine Grade 8 Socket Head Capscrews. Don't waste your time with crappy hardware bolts.
And good luck with that, too!
Hardly anyone carries good quality screws anymore in stock, "Grade 8" (which the Chinese seem to think is a brand name of some sort, and to which the rubes have been willing buyers of) gets thrown around a lot, and often enough, misused. The grade refers to the supposed strength of the bolt, and it's capacity to either bend or shear cleanly, rather than the quality of it's threads.
If you really want to buy a decent quality screw with a screw thread that is sized to secs that you can actually look up, you pretty much have to start looking for sources for aviation grade hardware and sort out a part number from the multitudes of specs out there. Everything is available from stuff worth less than the CTire screws, on up to screws with precision ground, very, very pretty, and accurate threads, in about ten thousand variations of head shape and size, shank lengths, and assorted materials ranging from stuff that may well be chrome plated dry cheese, on up to Inconel and other exotic alloys.
But shopping for a screw from the nut and bolt supply place is more likely to get you a 'good' one, than by heading to the big box store and looking over the grade 8 hardware bins, IMO.
Yer gonna want to know the angle of the countersink, if the slot head countersunk screws are the ones you are looking at. Angles vary, depending on their original source. Lots of 100 degree heads used in Airplanes, 90 is used a lot, as is 87, as well as a few others. It matters, if you want it to fit.
Screw threads are mostly rolled on. Cut threads sacrifice strength for cheaper tooling, and ground threads are too slow to make to be used much unless they are the only way.
The great thing about standards is that there are so MANY to choose from, eh?
Cheers
Trev
Blastattack
CGN Ultra frequent flyer
- Location
- Winnipeg MB
And good luck with that, too!
Hardly anyone carries good quality screws anymore in stock, "Grade 8" (which the Chinese seem to think is a brand name of some sort, and to which the rubes have been willing buyers of) gets thrown around a lot, and often enough, misused. The grade refers to the supposed strength of the bolt, and it's capacity to either bend or shear cleanly, rather than the quality of it's threads.
If you really want to buy a decent quality screw with a screw thread that is sized to secs that you can actually look up, you pretty much have to start looking for sources for aviation grade hardware and sort out a part number from the multitudes of specs out there. Everything is available from stuff worth less than the CTire screws, on up to screws with precision ground, very, very pretty, and accurate threads, in about ten thousand variations of head shape and size, shank lengths, and assorted materials ranging from stuff that may well be chrome plated dry cheese, on up to Inconel and other exotic alloys.
But shopping for a screw from the nut and bolt supply place is more likely to get you a 'good' one, than by heading to the big box store and looking over the grade 8 hardware bins, IMO.
Yer gonna want to know the angle of the countersink, if the slot head countersunk screws are the ones you are looking at. Angles vary, depending on their original source. Lots of 100 degree heads used in Airplanes, 90 is used a lot, as is 87, as well as a few others. It matters, if you want it to fit.
Screw threads are mostly rolled on. Cut threads sacrifice strength for cheaper tooling, and ground threads are too slow to make to be used much unless they are the only way.
The great thing about standards is that there are so MANY to choose from, eh?
Cheers
Trev
Amazon.com has literally thousands of in-stock screws, bolts and other fasteners to choose from and fairly reasonable shipping rates, and they do ship that kind of stuff to Canada. Obviously they will cost far more then buying it locally sans shipping, but still relatively inexpensive.
Who re-tapped it?
Because if it was a metric thread that was close to the 10-32 size, but not quite, it could well be that you are scrooged from having the tap run down and superimposing the two different size threads.
The alternatives include, live with it, go bigger, install a thread insert, or weld and re-do. Oversize custom made screws are another option, maybe.
The number sizes past number 10 are pretty uncommon, except in a few odd circumstances. For some reason, a #12-24 screw became the standard for computer server rackmounts. The next almost common number size screw was the #14, and it was so close to a 1/4 inch that nobody seemed to bother with it.
The larger number sizes are more common in wood screws rather than machine screws.
Taps can be got in larger sizes in 32 pitch, like 1/4-32 if you are willing to order them in. Or in any custom decimal size you ask for, if you really want them. May be worth checking to see if Brownells carries any oversize screws for 10-32 holes, like they do for the smaller scope mount screws.
Cheers
Trev
