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Source for a tap

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Source for a tap

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Old 01-21-06, 09:10 PM
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phantomcow2
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Source for a tap

All i've found is McMaster-Carr, and its 25 bucks. Is there any other source i should look at that might give me a better price? The tap size is 1/2-18
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Old 01-21-06, 09:17 PM
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try local auto parts-auto zone etc. lowes-home depot also have taps. i work for a tool&die shop, get all the taps i need.
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Old 01-21-06, 09:21 PM
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Autopart stores and home depot places dont carry the UNS taps. .
I think theres a tool and die shop around here that does sell special taps, i might check them out. If i cant get it at a reasonable cost, i will just make my own tap.
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Old 01-21-06, 09:41 PM
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Try here.
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Old 01-23-06, 04:49 PM
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Are you sure of the size? Should be 1-2-13 or 1-2-20. An 18 pitch is a 9-16 tap.
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Old 01-23-06, 06:06 PM
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1/2-13 is Unified Coarse.
1/2-20 is Unified Fine
1/2-18 is Unified Special

Measured it with a pitch guage, and OD is measured with calipers. Its definantly a UNS.
I really want to use it too, its already got a preloaded set of angular contacts
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Old 01-23-06, 06:27 PM
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If it's special, I can probably find a metric one that fits...
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Old 01-23-06, 06:39 PM
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Originally Posted by slvoid
If it's special, I can probably find a metric one that fits...
Are you sure? Would that be the 12x1.25mm?
It would be going for a delrin nut
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Old 01-23-06, 10:32 PM
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Depends on what your tolerances are.
If it happens to fall inbetween, bingo!
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Old 01-23-06, 10:43 PM
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well for my tolerances....
I just need a delrin nut, backlash is not a concern as I will have two nuts to counter that. Thats a good thought though, thankyou. TOmmorow i will check out my metric taps.

If that does not work, im just going to make a damn tap and be done with it.
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Old 01-23-06, 11:12 PM
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But how will you tap the tap... I'd tap that.
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Old 01-24-06, 05:24 AM
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tap the tap?
Cut the 1/2-18 threads on a lathe, from steel of course.
Turn a taper for the first 9 or 10 threads.
Mill 4 somewhat deep flutes using a 3/16 end mill. Make those edges nice and sharp.

ANd maybe, because ive never done it before, harden it using a furnace.
I've done this once with a 5/8-8 ACME 2 start. Could not even find a tap for that one
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Old 01-24-06, 07:06 AM
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Shoot. My entire tap (and die!) set cost about $20.

Any swap meets close by? A Harbor Freight store?

The swap meet taps may not be the best quality, but you aren't running a high volume machine shop!
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Old 01-24-06, 09:13 AM
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Geez! My whole Fly cutter with an NPT included on it was only $2.99.
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