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Tap and plug size??

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Dave K.

04-24-2002 13:54:04




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I have a hole someone drilled in a casting on my tractor that I wish to plug. The hole takes exactly a 1/2 inch drill bit. My 1/2 inch tap will not tap it as the tap requires a slightly smaller hole be drilled. My taps and drills only go up to 1/2 inch so obviously I need a larger tap at the least. What size tap should I buy to tap the 1/2 inch drilled hole? What size bolt or plug will then thread into this hole? If nothing is near this size then what size bit and tap is recommended to tap and plug this hole? The hole is drilled into the hydraulic sump and thus has non-pressurized hydraulic oil on the inside.

Thanks,

Dave

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cannonball

04-26-2002 12:07:01




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
how about buying heli-coil kit and putting it in..would put you back to 1/2 inch bolt threads



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Dave K.

04-25-2002 13:08:47




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
Thanks to everyone who has answered. I see many good ideas here!

Dave



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jake

04-24-2002 21:14:52




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
Go to Google search engine and search for tap and drill sizes. You will find dozens of charts for proper sizes, I keep several around in my work areas.



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Mac

04-24-2002 18:16:10




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
Me thinks I would get a small neophrene cork. Drill a 3/16 hole in it. Insert screw and washer from back side, shove it in hole and put a washer and wingnut on the outside. Tightn the wingnut and the cork or plug will expand to seal the hole.
They make replacement freeze plugs the same way but don't know about a 1/2 inch size..



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Gordon in IN

04-24-2002 18:03:16




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
Just use a 1/2 inch "freeze plug" or "cap plug" as someone else recommended. Seal it in place with "Permatex", "Loctite", or "Superglue" or "Superglue Jell". The plugs are available in most auto supply stores in a wide range of sizes and are verv handy for such applacations. Some auto supply stores even have the plugs in "Brass" material which I like best since you do not have to worry about them EVER "rusting out". Good luck, Gordon in IN

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Rod (NH)

04-24-2002 16:34:50




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
Hi Dave,

Coupla thoughts:

1. 1/2" dia is the tap drill size for a 9/16-18 UNF standard thread. If you could obtain a 9/16-18 tap, you could avoid drilling large holes with a hand drill altogether. Fine thread bolts should be available in auto supply stores.

2. Since it is only a sump with no high pressure on either side, the easiest and cheapest way to plug the hole would be to use a piece of 1/2" dia steel rod held in place with Loctite bearing retaining compound. Loctite RC/620 would work good for that application.

Rod

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VaTom

04-24-2002 17:36:45




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 Re: Re: Tap and plug size?? in reply to Rod (NH), 04-24-2002 16:34:50  
Similar to Rod's #2, how about a plug? I've been working on my Cat transmission and there are 3 plugs, a little like freeze plugs but a LOT smaller (maybe 3/4") that I had to remove to get shafts out. Don't know what sizes they come in but if you can find one to fit, it sure would be your easiest and safest way to plug the hole. No metal debris from drilling or tapping.



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Denny Frisk

04-24-2002 14:29:08




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 Re: Tap and plug size?? in reply to Dave K., 04-24-2002 13:54:04  
I'd tap it 3/8" pipe thread. I think the tap drill size is 9/16" for that...



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Dave K

04-24-2002 14:32:01




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 Re: Re: Tap and plug size?? in reply to Denny Frisk, 04-24-2002 14:29:08  
The tap itself would be 3/8 pipe and the bit 9/16, is that correct Denny?

Dave



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Glenn

04-24-2002 17:02:30




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 Re: Re: Re: Tap and plug size?? in reply to Dave K, 04-24-2002 14:32:01  
Dave go a little at a time when tapping because normaly if you had the tools you would run a pipe tap reamer in the hole first to accomadate the taperd tap. 9/16 is the right size drill for certain taps but if it seems tight step up to 19/32.



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Vic

04-25-2002 04:57:58




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 Re: Re: Re: Re: Tap and plug size?? in reply to Glenn, 04-24-2002 17:02:30  
Use light grease on the drill and tap in order to trap the metal shavings and keep them from falling inside the chamber.



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