2 replies to this topic

[hungdynasty]

Hi, just wonder if anyone know the thread size and length of this bolt

 

27h4353 BOLT-CALIPER HALVES-8.4'' BRAKES 

 

Thanks a lot!

Edited by hungdynasty, 29 March 2022 - 02:23 PM.

[richmondclassicsnorthwales]

Pretty sure they are 7/16 thread x 20 TPI x 1.4 "

 

The machine bolts (BMC Part # 27H 4353) that are used to assemble the halves of the brake calipers are special 'Torque-To-Yield' bolts, and as such the factory always recommended that they should not be reused.

 

These machine bolts are torqued to a specific value, and then turned an additional number of degrees. How many more degrees is dependent upon the recommendation of the manufacturer 

 

 

They have a shouldered head and shank, 7/16"-20 UNF x 1.4", and are marked on the head with three hash marks at 120 degree intervals, and the letter 'S' refers to the tensile strength of the machine bolt (50-55 Tons per square inch)

[hungdynasty]

Pretty sure they are 7/16 thread x 20 TPI x 1.4 "

 

The machine bolts (BMC Part # 27H 4353) that are used to assemble the halves of the brake calipers are special 'Torque-To-Yield' bolts, and as such the factory always recommended that they should not be reused.

 

These machine bolts are torqued to a specific value, and then turned an additional number of degrees. How many more degrees is dependent upon the recommendation of the manufacturer 

 

 

They have a shouldered head and shank, 7/16"-20 UNF x 1.4", and are marked on the head with three hash marks at 120 degree intervals, and the letter 'S' refers to the tensile strength of the machine bolt (50-55 Tons per square inch)

Thank you very much!