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Drill Size For 3/4 bolt

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SuperA-Tx

09-22-2006 15:25:04

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Where the front cultivators hook up on the tractor (Super A) there are four bolts in a square tube. I think the original size of the bolts was/is 5/8. Two on mine are stripped, one is fine, and one was redrilled a long time ago and now has a 3/4 inch bolt (course threads on all).

I want all the bolts to be the same and have decided to make them all 3/4" course thread.

Question is what size of drill bit do I use? Some sites say 21/32 and some say 17/32.

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El Toro

09-23-2006 07:10:19

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Re: Drill Size For 3/4 bolt in reply to SuperA-Tx, 09-22-2006 15:25:04

Here's another tap drill chart web site. Hal

http://www.boltdepot.com/fastener-information/US-Tap-Drill-Size.aspx

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karl Hamson

09-22-2006 16:52:37

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Re: Drill Size For 3/4 bolt in reply to SuperA-Tx, 09-22-2006 15:25:04

For 3/4 coarse the tap drill is 21/32
for 3/4 fine it is 11/16. Hope this helps

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SuperA-Tx

09-22-2006 17:36:30

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Re: Drill Size For 3/4 bolt in reply to karl Hamson, 09-22-2006 16:52:37

Yep, thats what I wanted to know for sure.

Thanks

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landlord7012

09-22-2006 18:50:40

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Re: Drill Size For 3/4 bolt in reply to SuperA-Tx, 09-22-2006 17:36:30

17/32 is for 5/8-11 thd

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RustyFarmall

09-22-2006 15:50:24

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Re: Drill Size For 3/4 bolt in reply to SuperA-Tx, 09-22-2006 15:25:04

I think the different sizes are related to what material you are working with. In other words, the 17/32 might be what you want if you were working in steel, and the 21/32 would be for cast iron, but I would need to dig out my machinists handbook before I could say for sure. It also has something to do with course or fine threads. I'm sure someone else can tell what you need to know right off the top of their head. If not, I'll crack open the book.

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SuperA-Tx

09-22-2006 16:35:20

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Re: Drill Size For 3/4 bolt in reply to RustyFarmall, 09-22-2006 15:50:24

They say 11/16 for fine thread but Im not useing fine threads.

The below site says 21/32 and all of the others I find say the same thing. Just one said something else.

Link

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nballen

09-22-2006 15:48:02

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Re: Drill Size For 3/4 bolt in reply to SuperA-Tx, 09-22-2006 15:25:04

Is this for a tapped hole...
OR
Is this a bolt clearance hole...?

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SuperA-Tx

09-22-2006 16:21:51

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Re: Drill Size For 3/4 bolt in reply to nballen, 09-22-2006 15:48:02

A tapped hole.

The two cultivator arms attach to it and you tighten the bolts down to hold the two arms, two bolts per arm.

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