Metal thread tapping question for machinists or anyone
Road Warrior
Joined: Mar 2007
Posts: 1,396
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From:
If it's only 1/8 thick it's way to thin to tap. Rule of thumb the minimum depth needs 1-1/2 times the bolt diameter. So a 1/2" bolt needs to be tapped 3/4 inch deep. Machinist/Tool and Die Maker for 37 years. I guarantee it won't hold long in 1/8 thick steel no matter how fine the thread! If clearance for a wrench is a problem look at welding a nut to the back of your bracket and then drilling through the hole. Then you have the strength of the nut and don't need to get a wrench behind the bracket..
Last edited by Northside; Jan 26, 2010 at 11:07 PM.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
After reading the post again I agree.Thought the bracket that was being bolted on was 1/8 thick.
A 1/8 deep hole is too shallow.
A 1/8 deep hole is too shallow.
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