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Black Shadow rear brake drums?
- Thread starter kick69
- Start date
Which is five bolts too many. Both from the bloody knuckles point of view, and the mechanical.
Last edited:
F
Flatout
Guest
I'm getting my Comet rebuilt and I've been advised to go for M8 s/s allen cap screws and M8 s/s Nyloc nuts as it's a huge saving.
The grade is 304 I think. Probably wreck a few blades in the process!
Metric cap heads & nuts-oh dear! I appreciate the cost cutting factor but as long as Imperial fasteners are still available let's use them. Besides, 8mm
and 5/16ths are not the same thing. The original brake drum bolts are "fitted" bolts for good reason because they are in sheer when braking and, in the case of the rear hub, under acceleration.
and 5/16ths are not the same thing. The original brake drum bolts are "fitted" bolts for good reason because they are in sheer when braking and, in the case of the rear hub, under acceleration.
Brake drum bolts
Hello,
Just been out in the cold garage to measure some bolts.
The bag of about 100 original ones has two types. One has a round eccentric head and is .311 under the head. the others are hex head with 2 reduced sides, these are .309 under the head.
The round head type appears better quality, if you will forgive the pun all round.
5/16 is .3125, 8mm is .3150 so I would think unless some malefactor opened out the holes it would be no go, but I do not have any to measure to check.
Imperial allen bolts have served me well for more than 30 years, ideally they should be bolts not set screws. The only drum failure so far has been the sprocket flange coming clean off at Cadwell. John.
Hello,
Just been out in the cold garage to measure some bolts.
The bag of about 100 original ones has two types. One has a round eccentric head and is .311 under the head. the others are hex head with 2 reduced sides, these are .309 under the head.
The round head type appears better quality, if you will forgive the pun all round.
5/16 is .3125, 8mm is .3150 so I would think unless some malefactor opened out the holes it would be no go, but I do not have any to measure to check.
Imperial allen bolts have served me well for more than 30 years, ideally they should be bolts not set screws. The only drum failure so far has been the sprocket flange coming clean off at Cadwell. John.
Brake drum bolts
Hello,
How sad is this, had a better look at my bag of bolts in day light, and discovered more flavours.
The hex head with flats comes from two makers one type is marker Newton, and has a thin head. The other with a slightly thicker head is stamped with a capital D.
Also found five bolts with a round head that is not eccentric, but has a taper with two flats.
Must try and get a life. John.
Hello,
How sad is this, had a better look at my bag of bolts in day light, and discovered more flavours.
The hex head with flats comes from two makers one type is marker Newton, and has a thin head. The other with a slightly thicker head is stamped with a capital D.
Also found five bolts with a round head that is not eccentric, but has a taper with two flats.
Must try and get a life. John.