MGA Part Numbers

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MGA Part Numbers - BTB104
Stud, Brake disc, Wire wheel front (1600, 1600-MK-II)

PART NO.  SPL.PAGE  DESCRIPTION                                                           
BTB104    16.K.1    Stud -brake disc (8), disc wheels -(front axle and suspension, 1600
    and 1600-MK-II Std.model) -Fin.(C)69505 (changed from studs to bolts)
BTB104    16.K.1    Stud -brake disc (8), wire wheels -(front axle and suspension, 1600
    and 1600-MK-II Std.model) -Fin.(C)70275 (changed from studs to bolts)
 BTB145   16.K.1    Bolt -brake disc to hub (8), disc wheels -(front axle and suspension,
    1600 and 1600-MK-II std.model) Com.(C)69505 (changed from BTB104 studs to bolts)
 BTB145    16.K.1    Bolt -brake disc to hub (8),wire wheels -(front axle and suspension,
    1600 and 1600-MK-II std.model) Com.(C)70275 (changed from BTB104 studs to bolts)

Stud for securing , brake disc to front bearing hub, MGA 1600, 1600-MK-II

For more reference information, see Replacing Wheel Studs WL-103

BTB104 is a special drawing number for a knurled neck stud for securing the brake rotor disc to the front wheel bearing hub of MGA 1600 cars.The same stud is used for the Wire wheel and disc wheel hubs, so items 22 and 27 in the illustrations at right are the same part. Thread size is 3/8-24-UNF on the high strength stud with knurled neck under the head.

With a design change, this stud changed to a BTB145 special hex head bolt.
The knurled neck stud finished at (C)69504 for disc wheels, and (C)70275 for wire wheels.
The hex head bolt commenced at (C)69505 for disc wheels, and (C)70276 for wire wheels.
Note that the bearing hub assembly numbers changed at the same time.

This design change happened in June 1959 following introduction of the 1600 model in May 1959 at (C)68851. As such, only 655 DW cars and 1426 WW cars got the early knurled neck studs. The BTB104 knurled neck studs may be hard to find as modern replacement parts.

Alternate part number: 264-710 ((Moss Motors).