I'd like to get a hold of one 4-48 screw to test to see if it fits into the business (test contact) end of a Federal test indicator I have. If it fits I will need one or 2 screws at least 1/2" long, any head or no head, but just to test any 4-48 thread should do. Tough to measure just what it is, but it's not
4-40 or any M3 I tried. Any help appreciated Nick Hull
2702 Kimbrell RD Lenoir City TN 37772 snipped-for-privacy@isp.com
865-856-6185
Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
4-48 is a standard thread. May not find it in every hardware store, but any fastener supplier or mail order source should stock it. What's the problem?
If you can't find a screw locally, you can probably find a tap in that size.
========= I bought a box of 100 set screws in this size.
Look for an envelope with some. I got these to make up extension rods for my drop test indicator without having to cut the 4-48 male thread.
Drill a hole in the end of the rod just under major diameter, tap (10-20% depth of thread is adequate) and install setscrew to proper depth with drop of loctite or superglue. Be sure to clean the external threads with lacquer thinner before the glue sets.
Tip for drilling ultra small [for me] holes in your lathe. Get a set of pin vises for an example click on
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got the General equivilant which works fine for me.
Also get drill blanks that just fit in the hollow in the handle. Chuck up the drill blank in the tailstock and use this as a guide for the pin vise. Gives very good control / feel and you can also use this for a tap guide.
They also make sensitive drill chucks, but these are expensive and you can use the pin vises for other things. example click on
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see top of page.
Good luck and let the group know how the project turns out.
Unka' George [George McDuffee] ============ Merchants have no country. The mere spot they stand on does not constitute so strong an attachment as that from which they draw their gains.
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Yes, a tap instead of a screw. Seems as though all he wants to do is run it into the hole to confirm the thread size. Not great for the tap if the piece is hardened, but a few tries wouldn't hurt it.
It's my guess that more of us have that tap lying around - as part of a set - than a box of 4-48 screws.
Standard indicator points are 4-48 thread, check the catalogs. 48 tpi is a little fine for it, but I've used a sliver of fine-grained wood in the past to check internal thread pitch. Whittle it down, screw it into the hole, back it out and check the pitch with a thread pitch gauge.
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