BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: cornishbob on 21 Jun, 2024, 19:34

Title: countersunk bolts???
Post by: cornishbob on 21 Jun, 2024, 19:34
are 5/16 bscy countersunk bolts availible anywhere? i just need 4 1 1/4 long
Title: Re: countersunk bolts???
Post by: V500 on 21 Jun, 2024, 21:24
I don't think I've ever even seen a C/S bolt?
Title: Re: countersunk bolts???
Post by: cornishbob on 22 Jun, 2024, 09:42
i've searched and searched and searched again but cant find any.

are allen machine screws availible anywhere?

i need 4 bolts 5/16  1" long but have to be bscy
Title: Re: countersunk bolts???
Post by: yellow B31 on 22 Jun, 2024, 12:42
If your handy with a lathe bolt heads are easily converted to countersunk with the addition of a screw driver slot.
Title: Re: countersunk bolts???
Post by: Steve.S on 22 Jun, 2024, 13:50
Try Viceman.
Title: Re: countersunk bolts???
Post by: cornishbob on 22 Jun, 2024, 14:12
ive already thought about turning some but they'd need torquing and a slot wouldnt do

i'll try viceman cheers
Title: Re: countersunk bolts???
Post by: Steve.S on 22 Jun, 2024, 14:39
Sorry, I misread your post. I don't get out much but I've never seen a countersunk bolt on a BSA, although no doubt Japan used them.
You could turn some up from hexagon bar in a lathe, but if you must use a Torque Wrench, you could use a slotted screw with a 1/2" drive slotted screwdriver bit. I might use a machine screw and tighten it by feel, but maybe it needs high torque?
Title: Re: countersunk bolts???
Post by: cornishbob on 22 Jun, 2024, 16:19
its for a plate to cover the handle bar mounts on the top yoke. needs to be a bit tight

i dont want high bars but i want the bars i have a little higher

i have a dinky set of risers but they have a 12mm cente bolt and the 'stem' is 1" so would interfere with the bolts for the plate.

its easy to get riser extensions but they're a bit meaty.

i'm tempted to use a set of harley risers at 3 1/2 centres but that seems to lack imagination and everyone would know.

the cogs are still turning

Title: Re: countersunk bolts???
Post by: cornishbob on 23 Jun, 2024, 10:09
decided to make my own...pretty obvious...too obvious. i have some long 5/16 unc csk bolts that are only part threaded. cut off the threaded bit and just thread it up again

too easy. why was i giung round the houses making it hard for myself