What size bolt for Dovetail?

[rawhead]

Just been all round town and failed to find one that screws into the centre hole of the short skywatcher dovetail plate

M6 bolt is too big (1/4'') The 3/16'' was too small…

Thanks

Jon

[steppenwolf]

Hi John, you need a 1/4" Whitworth bolt.

[rawhead]

Hi John, you need a 1/4" Whitworth bolt.

Cheers

[Andrew*]

Hi John, you need a 1/4" Whitworth bolt.

:wave: I have some. PM me.

Andrew

[rawhead]

Hi John, you need a 1/4" Whitworth bolt.

:wave: I have some. PM me.

Andrew

Thanks very much :thumbleft: PM sent..

[barkis]

I thought Whitworth had been discontinued for ages now. The only bolt head my old 1/4" Whitworth spanner will fit is a battery clamp bolt on a very old car. When I wanted a 3" long 1/4" Whit. bolt to make a mirror lock device for my LX90, The local engineering hardware supplier didn't sell Whit. bolts, but he did have a length of rod, and fortunately some nuts too, but he said they were the last in stock.

Ron.

[Tinkerbell]

If anyone needs any SS fixings in either BSW or UNC this is the place to go

BSW http://stigfasteners.easywebstore.co.uk/Whitworth-BSW-_B244N.aspx

UNC http://stigfasteners.easywebstore.co.uk/UNC-Unified-Coarse-_B22YK.aspx

You can also use UNC 1/4-20 in place of BSW 1/4 as the thread pitch is very similar.

[Helen]

I thought Whitworth had been discontinued for ages now. The only bolt head my old 1/4" Whitworth spanner will fit is a battery clamp bolt on a very old car. When I wanted a 3" long 1/4" Whit. bolt to make a mirror lock device for my LX90, The local engineering hardware supplier didn't sell Whit. bolts, but he did have a length of rod, and fortunately some nuts too, but he said they were the last in stock.

Ron.

Still used for camera tripod attachments, Ron, and not many places stock them. Thank goodness for the internet and stigfastners :hello1:

Helen

[Kaptain Klevtsov]

You can also use UNC 1/4-20 in place of BSW 1/4 as the thread pitch is very similar.

Its similar enough to be identical.

The difference is in the angle of the sides of the thread, UNC is cut with a 60 degree pointed cutter, Whitworth uses a 55 degree cutter. This means that you can use a UNC instead of Whitworth, but its not a proper fit.

Kaptain Klevtsov

[rawhead]

Hi John, you need a 1/4" Whitworth bolt.

:wave: I have some. PM me.

Andrew

Arrived yesterday. Thanks again Andrew

[George]

I thought Whitworth had been discontinued for ages now. The only bolt head my old 1/4" Whitworth spanner will fit is a battery clamp bolt on a very old car. When I wanted a 3" long 1/4" Whit. bolt to make a mirror lock device for my LX90, The local engineering hardware supplier didn't sell Whit. bolts, but he did have a length of rod, and fortunately some nuts too, but he said they were the last in stock.

Ron.

Most of the bolts on Synta mounts seems to be Whitworth......seems the Chinese are a little bit behind