Bolt Sizes from Part Numbers

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pbaillie

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When I go into a dealer to get some bolts, he can look something up on his computer to find out what size it is.
Like the other day, I was looking for SX108201 to fix my clutch on with. Aha he says, that's an M8 x 20 mm. Trouble is it's 53p at the dealer, and around £2.29 per hundred at Screwfix.
So the question is, what do they have? Is it a CD or an online resource only dealers can get at, or can you work it out somehow from the number?
 
Well I have the official parts catalogues, and all I seem to have is reams of descriptions like "nut" and "bolt". Only a very few have the sizes. What am I missing?
And I don't have much experience but I'm on a steep curve.
 
most of yer series bolts are unf and newer **** usually gort metric. all yer need to be able to do is judge the length and dia . and the length of any shank. dead fooking easy
 
About 10 years ago LR started renumbering bolts. the first two letters would define the type of bolt, type of head etc, the following numbers would tell you the diameter and length
As far as I no, no official code was published, but any parts man who took an interest in his job (there are a few) would soon start to work it out.
Weather they will disclose that information depends on what kind of relationship you have built up with them (not the same thing as how much you have spent with them!)
Unfortunately it is over five years since I moved on, so I can't remember anything useful.
 
Hex head bolts and set screws are all to BS3692. This is essentially the same as the unified BS/EN/DIN/ISO 24014 standard, but there are additional sizes that are only in BSI, and the high tensile bolts are of a higher material spec than the unified standard. An example of these bolts are the M12 set screws that hold your bulkhead and floorpan to the outriggers.

Without sounding a boring fart, you can look up these values on t'interweb if you know the correct standard numbers (or I click the library button in me favourite CAD program). Socket head cap screws are to BS4168 also...
 
Take5 said:
Hex head bolts and set screws are all to BS3692. This is essentially the same as the unified BS/EN/DIN/ISO 24014 standard, but there are additional sizes that are only in BSI, and the high tensile bolts are of a higher material spec than the unified standard. An example of these bolts are the M12 set screws that hold your bulkhead and floorpan to the outriggers.

Without sounding a boring fart, you can look up these values on t'interweb if you know the correct standard numbers (or I click the library button in me favourite CAD program). Socket head cap screws are to BS4168 also...
Click to expand...
wtf has that gotta do with sizes?
 
Wiffout tekkin a bolt out, using yer steel rule you should be able to know exactly what size summat is as per definition in BS whatever. 19mm Head = M12, length will be 40, 45, 50, 60 etc, so you can order correct one before even removing a nut...

Jest a thought thas all...
 
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