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| How to callout how to drill threaded holes |  | ||
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| Posted by: Hitokiri03 ® 01/06/2011, 14:03:28 Author Profile eMail author Edit |
I am making an engineering drawing for a plate that has some holes drilled for a couple different kinds of screws and I don't know how to do a callout for how to drill the hole and co'bore it. The two sizes are 3/8-16 coarse thread and 1/4-28 fine thread. Thanks for the help. |
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| : How to callout how to drill threaded holes | | ||
: How to callout how to drill threaded holes -- Hitokiri03 |
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| Posted by: Kelly Bramble ® 01/12/2011, 17:38:39 Author Profile eMail author Edit |
Well, generally we don't specify the pre-drill hole for tapping. We call out the threaded hole feature end-item requirement e.g. Arrow pointing to threaded hole feature with 3/8 - 16 UNC -2B or 5X .250-28 UNF - 2A, .500 MIN FULL THREAD 5X = means there are five holes that must meet this requiremnt. |
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: : How to callout how to drill threaded holes -- Kelly Bramble |
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| Posted by: tk369 ® 01/19/2011, 09:38:28 Author Profile eMail author Edit |
According to my Holo-Krome screw selector guide, a 1/4-28 UNF-2A tap drill is dia .2187. A 3/8-16 UNC-2B tap drill is dia .313. A typical callout would be: 3/8-16 UNC 2B
or 1/4-28 UNF-2A
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