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Timleech
03-13-2011, 03:50 PM
I've just been sorting through a box of ex-Ministry taps that I bought, noticed that a number of them are marked
"**Whit Zone 3 HSS" (All are Goliath brand I think)

What is Zone 3? Any clues? a grade of HSS, or a specific thread size tolerance? They look to be perfectly ordinary Whitworth taps, though I haven't tried measuring any. There was a bunch of Whit and UNC wire insert taps among them, but these are not insert taps.

Thanks
Tim

small.planes
03-13-2011, 04:05 PM
Its the uk version of 48 short of a secret area

IGMC

Dave

shadoof
03-13-2011, 04:44 PM
Zoning B.S 949/1951

specified dims for taps there were 5 zones

Zone 1 ground taps for precision class 3b

Zone 2 ditto

Zone 3 ground taps for commercial work medium fit class 2b

Zone 4 ground taps used for machine nut taps

Zone 5 cut thread taps

from a CEJ booklet screwing taps and their uses


Lee

Timleech
03-13-2011, 04:53 PM
Zoning B.S 949/1951

specified dims for taps there were 5 zones

Zone 1 ground taps for precision class 3b

Zone 2 ditto

Zone 3 ground taps for commercial work medium fit class 2b

Zone 4 ground taps used for machine nut taps

Zone 5 cut thread taps

from a CEJ booklet screwing taps and their uses


Lee

Thankyou.

Bog standard taps, then ;)

Tim

shadoof
03-13-2011, 05:09 PM
yep, bog standard.

lee

Mcostello
03-13-2011, 09:46 PM
Here I thought it meant Chinese standard for the west, so that nothing would work right or could be disassembled so the great unlearned would run out and buy another, thereby guaranteeing Far East retirements.

TGTool
03-13-2011, 09:52 PM
Over here zones tell you when you can safely plant different things in the spring. We're in zone 7 so the zone 3 tap would have to go in much later than usual. I think for us it would mean count to four before you insert your tap. Dunno if I can wait that long. :eek:

DICKEYBIRD
03-14-2011, 08:33 AM
There was a bunch of Whit and UNC wire insert taps among them, but these are not insert taps.OK, ol' clueless here wants to know what the heck a wire insert tap is.:confused:

SDL
03-14-2011, 08:38 AM
OK, ol' clueless here wants to know what the heck a wire insert tap is.:confused:

Helicoils

see http://www.emhart.com/brands/heli-coil

Steve Larner