|Mike Davies 3||04/01/2022 14:52:18|
|5 forum posts|
Question as title : I have a chuck that came on a backplate that does not fit my lathe and the two are fitted together by hex screws with a head size of 17/32" (I assume it's 17/32", that or 13.5mm...). I believe these are used on some UK classic cars but am not into such so does anyone here know a source for 17/32" (or 13.5mm) ring spanners ?
If not then I will mangle the heads with an adjustable then turn the whole thing off...
22560 forum posts
1/4" whit may well do are they an exact imperial size or 0.525"
Edited By JasonB on 04/01/2022 15:06:36
|3549 forum posts|
1/4 whitworth in old money?
|David Jupp||04/01/2022 15:07:08|
|822 forum posts|
Depending upon origin/age of chuck, you may need a 1/4 W (also 5/16 BSF) spanner perhaps.
0.525" or 13.34mm AF
|Clive Brown 1||04/01/2022 15:09:41|
|807 forum posts|
1/4" Whitworth or 5/16" BSF spanner size is nominally 13.3 mm AF. Could it be that? If so then should be available.
|Martin Connelly||04/01/2022 15:42:09|
2123 forum posts
Google special spanners for English cars and motorbikes 17/32" .
|Mike Davies 3||04/01/2022 15:55:26|
|5 forum posts||
Yay ! Didn't think of that - £3.50 on eBay, ordered.
Thanks to all who pointed this out and for the replies,
|Nigel McBurney 1||04/01/2022 19:11:20|
999 forum posts
This size 17/32 may be an old American size, 60 years ago I bought a set of Gordon ring spanners and one spanner was 25/32 never used it for years until I got interested in old stationary engines,i made some new nuts for the 7/16 dia studs on an USA made 1912 Amanco stationary engine and found that some American coarse nuts had some odd sizes across flats,I found in some old info that the USA had a large hex system similar to our large nut Whitworth system ,they seem to have abandoned their system some time before we made the changes during the early part of WW2.
|Chris Evans 6||04/01/2022 19:33:50|
2050 forum posts
Pre-war BSA motorcycles use mainly whitworth sizes with some odd ball A/F including the above mentioned 25/32"
|3060 forum posts|
13mm and a file? Sorry, I’ll get my coat …
5065 forum posts
The small sizes under 5mm can be a pain though
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