Ashcroft air locker drill and tap sizes?

Gonna buy an ashcroft air locker tomorrow from Paddocks to treat myself for my birthday today.

Looking on the website it says the drill bit from ashcroft is 29/64 which is around 11.5mm so I'll buy an 11.5mm drill bit and then the tap I've read is 1/4 bsp however that tap is smaller than 11mm isn't it?

(29/64) or 11.8mm drill needed for 1/4 BSP tap, says my Zeus book

See here - http://www.newmantools.com/taps/bsp.htm

Second table down

Don't forget that the BSP size refers to the inside diameter of the pipe, so they're a lot bigger so as to allow for the wall thickness of those old iron gas and water pipes. So a 1/4" BSP would be around 1/2" in practice. So an 11 point something drill is probably about right.

stewd said:

(29/64) or 11.8mm drill needed for 1/4 BSP tap, says my Zeus book

See here - http://www.newmantools.com/taps/bsp.htm

Second table down

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Nice link that, But I do like my good old Zues book,

I lost mine the other month, had it for 20 years, ordered a replacement, one week later found the original.

Now I have two..........

Cheers

Cheers guys. Ordered a thread and plug set of taps and brought the locker today with a tyre air set so I just need to find time to fit it all Into the rear, move the arb to the front and at some point I'd like to make a receiver for the compressor so it's got a tank that's a little bigger for airing up tyres. Might use a small fire extinguisher.

I'd avoid using an old, fire extinguisher due to needed a fill, return and drain on a tank.

These are cheap enough to pick up these days (£30+depending on size)

stewd said:

I'd avoid using an old, fire extinguisher due to needed a fill, return and drain on a tank.

These are cheap enough to pick up these days (£30+depending on size)

Click to expand...

Where from? Could do with one