Caliper Bolts

[Fastinmydreams]

I was looking for new bolts for my uprated front calipers and have been advised by Caterham that these are what I need (7/16" x 1.5"):

https://caterhamparts.co.uk/search?controller=search&orderby=position&orderway=desc&search_query=77158BOLT&submit_search=

At nearly a tenner per bolt, they don't come cheap!  Does anyone know of a less expensive source?

 

[OldAndrewE]

Fairly certain Chris at Redline will be able to help

[SM25T]

Or try your local fastener supplier. There are still plenty about.

[Wrightpayne]

Spalding fastners or Kays on ebay. 

[rkeywood]

I use both the above for a lot of workshop supplies and found them very good - their regular websites can be easier to use and more comprehensive than their ebay shops (Kays is Kayfast.co.uk). Westfield fastenings (absolutely no association with you know what!!) are also very good for imperial stuff and tech' info.  You may well need to ring round suppliers as the Caterham image looks odd to me - 7/16 x 1 1/2" socket caps are usually supplied as fully threaded set screws at that size whereas hex head are available part threaded (1 1/8" thread). Also plated cap socket are less common. I've not seen the uprated calipers fitted but does it need to be a socket cap head?

Hope this helps

[Fastinmydreams]

The Kays' site does look useful.  That's one to bookmark.  I was surprised that Caterham recommended a cap head bolt.  The old ones are hex head and fully threaded.  Kays have a UNF bolt listed in the correct size at a fraction of the cost, but I don't know if the thread pitch matches.  

[rkeywood]

7/16" UNF is 20 tpi. If you're wanting to replace the existing like for like then check the markings on the head for tensile strength. Regular High Tensile (as Kays list) will be marked 8.8 or three radial lines (US Grade 5) or maybe an 'S' on older bolts. Higher Tensile will be 10.9 or 6 radial lines (US Grade 8) or 'V'. Socket caps are usually higher tensile 12.9.