[Tim W[_2_]]

John Rumm
wibbled on Wednesday 21 October 2009 20:08

Tim W wrote:
Just ordering some stuff from BES and browsed into the gas cooker bayonet
section.

They sell a kit of parts that contains:

1/2" standard cooker hose kit. Kit No.1 consists of :
6038 4' x 1/2" bayonet cooker hose
6775 15 mm end feed x 1/2" BSP T straight male adaptor, brass
0621 Plug-in angle socket
6048 Angled wall connector
9543 Cooker stability chain
7452 Wall plug, brown x 2
6366 F x F 90°elbow, malleable iron
10994 Pozi woodscrew x 2
6377 M x F 90°elbow, malleable iron


0621 is one of the usual 1/2" BSP-taper jobbies. Fine. But the bit to
which it connects, 6048 is described he


http://www.bes.co.uk/product/10~NG~2...onnectors.html

as a parallel thread.

I *thought* one should use taper to taper BSP or parallel to parallel and
not mix taper with parallel.

The point of taper (no pun intended!) fittings is when you want a seal
on the threads - hence you want to create an interference fit at some
point in the assembly process, so your sealing tape can do its stuff.
This can be done most commonly by screwing a taper male into a parallel
female. The reverse would also work however.

Thanks John. Isn't it weird how you can go round with a notion and never
question it.

I've done plenty of BSP taper joints - just never had to actually buy them
(ie re-did ones that were in place or put together bits someone else had
bought...)




--
Tim Watts

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