Elliott 200mm chuck backplate bolt size?

[David Leahy 1Participant @davidleahy1]

What size are the backplate bolts for this 8″ chuck?

[David Leahy 1Participant @davidleahy1]

Does anyone know what thread type and size the bolts are for this Elliott 8" chuck?

I cant seem to get any metric thread to fit and I don't any other taps to test fit? Does anyone know what bolts I need to buy?

Thanks for your assistance in advance!

Edited By David Leahy 1 on 17/09/2018 22:51:06

[BazyleParticipant @bazyle]

Screw a slither of wood or plastic down the threaded hole so it gets indented by the thread. remove and measure pitch, measure diameter of hole allowing for the thread depth. Being Elliott which is an old English make (still going btw as Gate) it will be BSW most probably with a possibility of BSF.

[Pete RimmerParticipant @peterimmer30576]

I have a 6" Forte chuck I'll check what bolts that uses and it might give you an idea.

[JonParticipant @jon]

Just took one of the 6 rear cap head bolts out on an Elliot Ultra 6 1/4" D 1-4 and they are standard metric M8 X 1.25.

Being an 8" it may be a standard M10 easy just measure the hole will be around 8.5/8.6mm dia or M8 being 6.8mm ish.

[Pete RimmerParticipant @peterimmer30576]

David, my 6" chuck has standard pitch M10 threads.

If you're still unsure about yours try a 6mm allen key in those screws already in your chuck then try a 1/4" allen key. If the 6mm fits but the 1/4" doesn't you know they are metric.

[JonParticipant @jon]

As above its metric and the 6" Elliot is M8 from early 1970.

[Pete RimmerParticipant @peterimmer30576]

Strange that they should use M8 in the Ultra and M10 in the Forte.

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