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BOLTS


Many bolt sizes are listed here prefixed BH, (Bolt, Hex head) the part number specifies the bolt type and size. For example bolts beginning BH1 are metric, BH2 are BSF, BH3 for BA, BH5 are UNC and bolts beginning BH6 are UNF. As follows:

1st Number denotes thread type
2nd & 3rd Denotes bolt diameter:
English units: increments 16th of an inch
Metric units: increments of 1mm, except BA where the BA size is used.
4th & 5th Indicates length:
English units: increments 8ths of an inch Metric units: increments 5mm
6th The last digit is reserved for variations and finish as follows:

0 = High tensile, (no particular suffix)
1 = BZP,
2 = Black,
3 = Chrome.
4 = Stainless Steel
5 = Non standard pitch BZP
6 = Further non standard variations
Therefore BH605131 is a 5/16" UNF x 1 5/8" bolt with BZP finish.

Cap head bolts are prefixed BC.

The benefit of this system is that all bolts can easily be identified as can a choice of bolt slightly longer or slightly shorter. In many cases Triumph used discrete part numbers and as a result there was no way of knowing what the part number would be of a bolt of a particular size required. This system allows for finding sizes easily within the range.

To view the Triumph Catalogue Plates, please pick a car type