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  #1  
Old 05-13-2008, 07:24 AM
n567vb n567vb is offline
 
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Location: MN
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Default Hole size for 8-32 tap?

Hi,

The directions for the roll bar say to drill a hole and then tap it for a 8-32 screw. I couldn't find anything that says what size hole to drill. Do you just measure the width of the tap minus the threads, or is there an actual specified drill size for a 8-32 hole?

Thanks
Vince
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  #2  
Old 05-13-2008, 07:31 AM
cholladay cholladay is offline
 
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I am pretty sure it is a # 29 drill. I have use a # 30 and it worked for me.
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  #3  
Old 05-13-2008, 07:31 AM
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AltonD AltonD is offline
 
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found this
http://www.shender4.com/thread_chart.htm
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  #4  
Old 05-13-2008, 07:35 AM
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Rick6a Rick6a is offline
 
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Quote:
Originally Posted by n567vb View Post
....drill a hole and then tap it for a 8-32 screw. I couldn't find anything that says what size hole to drill....... is there an actual specified drill size for a 8-32 hole?....
Most definitely there is a correct size when tapping holes. Such charts are widely available. I refer to my Craftsman chart and find that the standard pilot hole for 8-32 NC threads is to prepare the hole with a #29 drill bit which is the decimal equivalent of .136 diameter.
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  #5  
Old 05-13-2008, 07:48 AM
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bullojm1 bullojm1 is offline
 
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Location: Baltimore, MD
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Quote:
Originally Posted by n567vb View Post
The directions for the roll bar say to drill a hole and then tap it for a 8-32 screw. I couldn't find anything that says what size hole to drill. Do you just measure the width of the tap minus the threads, or is there an actual specified drill size for a 8-32 hole?

I think you better re-read the instructions/plans. A #6 screw is used to hold the canopy to the rollbar. The correct size for the pilot hole for a 6-32 tap is a #36 drill bit. A reference for pilot holes for taps is here: http://www.engineersedge.com/tap_drill_chart.htm
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  #6  
Old 05-13-2008, 09:54 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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The Cleaveland tool catalog has a great pull-out poster insert that has all kinds of great info for drill, tap, and rivet sizes. And it's free!
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  #7  
Old 05-13-2008, 01:31 PM
n567vb n567vb is offline
 
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Location: MN
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Thanks for the help. The screw I was talking about secures the roll bar to the angles that are bolted into the bulkhead. I'm not ready to put the Canopy on yet!!!

I knew there had to be some charts out there, but my aircraft handbook didn't have them

Thanks
Vince
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  #8  
Old 05-14-2008, 12:21 AM
arffguy arffguy is offline
 
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Location: Sacramento CA
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Quote:
Originally Posted by n567vb View Post

I knew there had to be some charts out there, but my aircraft handbook didn't have them

Thanks
Vince
For this reason I own at least three of those aircraft handbooks plus numerous other references. It seems one book is never enough.
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