Thread: making BSF bolts

The thread cutting is rather tricky for a novice like me , I bought a thread chasing dial, makes things quicker .

Why bother machining up bolts that cost very little and are readily available? Give Bruce Gardner of B.S.F. BOLTS a call on 0408 056 255. He is in Melbourne so should be no trouble for you to get some from him.

If you are going to do more of this then make life easier by getting a three jaw chuck. Setting a hex head in a four jaw is a total waste of time. You should not need to use a chasing dial on such a fine thread. One cut should do the job.

Mike

You are such a talent - you'll give anything a go!

Given that the originals had a head the same as the 9/16 wheel nuts, I wonder if it would work to use 9/16" bolts or the unified standard bolt with the same size head as the wheel nuts?

Next thing you need to do is work out how to sheridise and then we can all send our bolts and nuts down to you for processing!

Diana

If the internal threads in the bonnet mount are badly corroded, then an easy solution is to drill them out with either a 10.0mm or 25/64" drill and tap 7/16" x 20 tpi NF. This will give 75% thread depth and the NF bolts are cheaply available anywhere.

Brian, I don't suppose you know whether the source quoted above can supply the sherardised bolts required for this application? And how about the ones used for Series 3 with Metric heads to match the wheel nuts?

John

AFAIK The 27mm head ones for SIII and for that matter the ones for SII/SIIa had a larger bolt size, they were either 1/2" or 5/8"

Originally Posted by Lotz-A-Landies

AFAIK The 27mm head ones for SIII and for that matter the ones for SII/SIIa had a larger bolt size, they were either 1/2" or 5/8"

S2/2a and 3 are 1/2" BSF, but the heads are either 1/2W or 27mm to match the wheel nuts. (I swapped them recently when putting a S3 bonnet on my 2a).

Originally Posted by JDNSW

Brian, I don't suppose you know whether the source quoted above can supply the sherardised bolts required for this application? And how about the ones used for Series 3 with Metric heads to match the wheel nuts?

John

No idea. Why not 'phone Bruce. My contacts with him are mostly in regard to BA taps and dies of which he has an large quantity and wide range.

Perhaps retap the mounting plate to a suitable metric thread and use stainless bolts of that head size. Refit using Loctite nickel anti-seize whatever fasteners you end up with.