Help with Allen Head Cap bolts

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SUMMARY

The discussion centers on replacing low-quality Allen Head Cap bolts used in an aluminum headphone amplifier. The user identifies the bolt size as approximately 3/16 inch (3mm) wide with an Allen key size of 1.5-2mm, and estimates the length to be between 5mm and 10mm. A forum member advises that the cap screw is merely a head style on a standard bolt, suggesting that the user can find replacements at local hardware stores or through suppliers like McMaster-Carr.

PREREQUISITES
  • Understanding of bolt sizing conventions (metric and imperial)
  • Familiarity with Allen Head Cap bolt specifications
  • Basic knowledge of tools for unscrewing bolts
  • Experience with sourcing hardware from suppliers like McMaster-Carr
NEXT STEPS
  • Research Allen Head Cap bolt specifications and sizing standards
  • Visit local hardware stores to compare bolt sizes and styles
  • Explore online suppliers like McMaster-Carr for replacement options
  • Learn about different head styles of cap screws and their applications
USEFUL FOR

DIY enthusiasts, audio equipment builders, and anyone looking to replace or upgrade hardware components in electronic devices.

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Help with Allen Head Cap bolts...

Hi,
Received today a new headphone amp. It is aluminium construction and uses 4 allen cap bolts at each end to hold the case together. It is all good (was cheap), but the bolts used are clearly low quality and don't look right. I would like to replace them but can't find details on what size they are (head looks about 3/16 (3mm) wide, and allen looks like 1.5-2mm). I would imagine the bolt is only about 10mm long max, maybe more like 5mm. I will have to unscrew to check, but I don't want to do this until I'm reasonably sure I can replace.

I'm sorry if this is the wrong forum. Anybody advise on the sizing convention for these type of bolts (metric and imperial-Im not sure which these are), and where to buy replacements?

Many thanks in advance
Lock
 
Engineering news on Phys.org
Welcome to PF, Lock.
The cap screw is just a head style on a regularly sized bolt. You can get a replacement with just about any head style you want. Just take one down to your local hardware store and they'll set you up with a match.
 
Or try McMaster ones you know the style and code
 

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