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| Bluechip:
I think the Metric Series is getting as confused as Inch threads. I have some 3.5mm x 0.5mm myself. Not where I got them, but .... http://www.fish4parts.co.uk/Tools.1099/Thread-Insert-Systems-%252526-Cutting-%25252F-Tapping-Tools.10930252/Thread-Cutting-Taps.10930332/Metric-Fine.10930333/M3.5-x-0.5mm-Pitch-Straight-Flute-Second-Tap.100690.html?osCsid=jrjn1tqdhj5fhh6tbdssuvn8k5 Dave BC |
| Pete.:
--- Quote from: philf on October 13, 2013, 01:23:48 PM --- --- Quote from: angus on October 13, 2013, 11:56:43 AM ---hi i have a bit of a puzzler i am missing a screw from a williams rifle sight... its 0.138 diameter, so either 9/64 or 3.5mm and either 0.5mm pitch or 48tpi the books i have dont really give me a standard thread..... any idea's as to what thread it is ? --- End quote --- Angus, It looks very much like a 6-48 UNS to me. (Which is 6 gauge in neither UNF(ine) or UNC(oarse) but UNS(pecial).) I don't know where you would get a die to make a screw in the UK. They come in kits of taps & dies for gunsmiths in the US: http://www.brownells.com/gunsmith-tools-supplies/general-gunsmith-tools/taps-dies/tap-die-kits/tap-die-kit-no-1-prod713.aspx Cheers. Phil. --- End quote --- I think you're right, since the TPI matches and only 3 thou out on the OD from his measured size: http://www.muzzlecouplings.com/measuring_thread_size.htm http://www.ebay.com/bhp/6-48-screws |
| Jonny:
Still the most common thread used in US, theyre still on UNC, UNF but slowly changing over to metric. Taps and dies quite common here too and cheap because no one wants them about £4 delivered for an 8-32 HSS tap last month for US, dies about the same. Sure the 48TPI is about right? Williams I would have thought 6-32 or 8-32 if measured the threaded hole. |
| 75Plus:
6-40, 6-48 and 8-40 are common sizes found in US made firearms and have been for at least a century. Here is the inventory of a Master Gunsmiths 142 pc. screw assortment from Brownell's, one of the top gunsmithing parts sources in the US. Master Gunsmith Screw Kit-142 Kit Contains 10 each of 14 premium 3/32” hex style scope and base screws. These difficult to find screws are favored non-slip replacements for slotted screws. Set includes tweezers and thread size gauge/shortening jig. Kit Contains: #6-40 Fillister Head (3/8, ½) #6-40 Oval Head (1/4, 3/8) #6-48 Fillister Head (1/4, 3/8, 9/16) #6-48 Oval Head (1/4, 3/8) #8-40 Fillister Head (1/4, 3/8, ½) #8-40 Oval Head (1/4, ½) |
| angus:
--- Quote from: Jonny on October 14, 2013, 05:27:04 PM ---Still the most common thread used in US, theyre still on UNC, UNF but slowly changing over to metric. Taps and dies quite common here too and cheap because no one wants them about £4 delivered for an 8-32 HSS tap last month for US, dies about the same. Sure the 48TPI is about right? Williams I would have thought 6-32 or 8-32 if measured the threaded hole. --- End quote --- the measurements are of the other locking screw.... definitely seems to be 4-48.... a mate of a mate thinks he has some... time will tell |
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