I'm looking for a supplier of either 10mm 12mm 3/8 7/16 1/2 bolts with very long un-threaded section 6 to 8 inches. Any ideas?

There are a couple of company's on eBay, type the bolt spec in the search and see what comes up.

A-Series Spares do UNF/UNC socket head and hex head bolts (12.9 grade) up to 6" long and have long unthreaded portion.
(threaded about 1-1/2"

Google Astley Components (Feering) and DJ Evans (Bury St Edmunds) - they both have a good supply.

These guys have always helped me with any weird ones I need. And they deliver too:

http://www.ahc-camberley.co.uk/catalog/index.php

Cheers,
James

Non Standard Socket Screw Company in Birmingham

Thanks guys I'll let you know how I get on

SCH's (Socket Cap Head) have a thread length that is dependant on thread Diameter (rather than bolt length. So a 6" Long bolt will have the same length thread as a 3" long bolt. This means that a standard SHC will have a long un-threaded area if it is a long bolt (if that makes any sense).

So if you order a 10" Long standard M8 SHC (for instance) most of that will be unthreaded. Set Screws on the hand are threaded over there entire length.

Namrick do standard bolts upto 150mm Long (~6" in there standard Catalogue. For example 6" Long 7/16 UNf Bolt = £2.66.

You should be able to find a wealth of information here:

http://www.roymech.co.uk/Useful_Tables/Screws/index_screws.htm

Hopefully will be of use Liam.

Edit: Liam I have just realised that I have a load of large size and Long 12.9 grade Metric Cap Heads in my garage, you can have a load if they are what you need.

[Edited on 28/7/11 by Doctor Derek Doctors]