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  #1  
Old 06-27-2021, 08:57 AM
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JoopSJ JoopSJ is offline
 
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Default Identify this bolt size Sup cold air sump

I have a Superior cold air sump. Underneat thera are two locations where you can bolt a bracket or so.
Anyone could tell me which size bolt go in here?
I tried AN3 but I don't go past the first thread and don't want to force it.
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  #2  
Old 06-27-2021, 09:21 AM
Norman CYYJ Norman CYYJ is offline
 
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Try a 1/4 20.
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  #3  
Old 06-27-2021, 09:49 AM
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Quote:
Originally Posted by Norman CYYJ View Post
Try a 1/4 20.
Is that the same as AN4?
Do you have the part number?
Sorry, I live in metric world.
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  #4  
Old 06-27-2021, 10:28 AM
Bcone1381 Bcone1381 is offline
 
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I would not expect an AN bolt to fit into a threaded casting of a Lycoming Case.

All AN bolts have fine threads. The O-360 Parts Manual show typically (may be exclusively) that Lycomoing used coarse threads.

Last edited by Bcone1381 : 06-27-2021 at 10:31 AM.
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  #5  
Old 06-27-2021, 10:45 AM
Norman CYYJ Norman CYYJ is offline
 
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No it a course thread and very common
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  #6  
Old 06-27-2021, 10:50 AM
agent4573 agent4573 is online now
 
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Try MS35206-281 or AN515-416R12 or R16.

I'll be replacing mine with McMaster part
https://www.mcmaster.com/90124A542 since they're prefilled for safety wire.
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Last edited by agent4573 : 06-27-2021 at 10:58 AM.
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  #7  
Old 06-27-2021, 11:28 AM
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As said before, AN bolts are fine threads. Fine threads are seldom used in castings. If it is 3/16" it would probably be a 10-24. If it is 1/4" (most likely) it will probably be a 1/4-20. If it's 5/16", probably 5/16-18.
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Last edited by Mel : 06-27-2021 at 11:34 AM.
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  #8  
Old 06-27-2021, 11:40 AM
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Joop

For an easy example, this is the same thread as the Hex head bolts holding your valve covers on.

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  #9  
Old 06-27-2021, 11:40 AM
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Should have said "Philips" style heads. Pan head philips
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  #10  
Old 06-27-2021, 12:55 PM
deek deek is offline
 
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OP is in Europe; my experience in finding UNC fasteners in UK and Germany was frustrating.
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