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  #1  
Old 10-28-2008, 05:48 PM
szicree szicree is offline
 
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Question 1/4-20 drilled head bolts
Trying to find four 1/4-20 drilled head bolts to attach my airbox. Found 'em for $43 for a ten-pack. Seems a bit spendy!
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  #2  
Old 10-28-2008, 06:00 PM
grover grover is offline
 
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Default a bit?
I'd be trying to make my own out of hardware store bolts at that rate. but then, I'm a tightwad.
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  #3  
Old 10-28-2008, 06:08 PM
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N941WR N941WR is offline
 
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Default Drill your own
Get one of these jigs and you will be able to drill all the bolts you ever need and it will save you money even though it costs $59.75

(Click on picture for details)
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  #4  
Old 10-28-2008, 06:28 PM
Gary Bricker Gary Bricker is offline
 
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Thumbs up Gary Bricker
Are you wanting 1/4 x 20 threads per inch. If so go to Aircraft Spruce and get a AN4H-?A what ever length. That will get you a drilled head. Less that 1$ each.
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  #5  
Old 10-28-2008, 06:43 PM
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az_gila az_gila is offline
 
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Exclamation Not quite....
Quote:
Originally Posted by Gary Bricker View Post
Are you wanting 1/4 x 20 threads per inch. If so go to Aircraft Spruce and get a AN4H-?A what ever length. That will get you a drilled head. Less that 1$ each.
..an AN4 is a fine thread - which is 1/4 x 28

Most Lycoming engine bolts are coarse thread, which is the 1/4 x 20 Steve asked about....
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  #6  
Old 10-28-2008, 07:09 PM
Gary Bricker Gary Bricker is offline
 
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Angry Gary Bricker
Sorry, My mistake
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  #7  
Old 10-28-2008, 07:24 PM
Geoff
 
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Default McMaster-Carr
Quote:
Originally Posted by szicree View Post
Trying to find four 1/4-20 drilled head bolts to attach my airbox. Found 'em for $43 for a ten-pack. Seems a bit spendy!
Last year ACS quoted me more than that for a special low-quantity order, although I needed some extra-long ones because I have a spacer between the airbox and the injector.

I bought a drill jig and tried drilling some Grade 5 and Grade 8 bolts from the hardware store, but that didn't work very well for me (probably operator error).

I ended up ordering some 1/4-20 socket head cap screws (with a drilled head) from McMaster-Carr. Much cheaper and plenty strong enough.
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  #8  
Old 10-28-2008, 11:29 PM
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G-force G-force is offline
 
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Location: Castaic, CA
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Default
Quote:
Originally Posted by szicree View Post
Trying to find four 1/4-20 drilled head bolts to attach my airbox. Found 'em for $43 for a ten-pack. Seems a bit spendy!
What length? I stock a few sizes in grade 8 or F911 at work, under a buck each if I remember right.
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  #9  
Old 10-29-2008, 07:00 AM
lrfrey lrfrey is offline
 
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Default
Grade 5's and Grade 8's can be drilled if you have a drill press vice. Go slow, keep oiled and expect to brake a few drill bits though!

Larry
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  #10  
Old 10-29-2008, 08:05 AM
wilson wilson is offline
 
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Default wag aero
AN74A-4. About $1 ea.
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