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I don't have a Zeus book to hand, (liar, I found it ) but I reckon a 1/8th BSP tap and die set would give a pretty good thread.
1/8th BSP tapping drill 8.75mm (0.3445") thread pitch 26 TPI (26 threads per inch about 0.035" pitch).
Barrel o/d 13/32" (0.406", 10.30mm).
1/4 BSP is about 1/2"O/D

Don W
PS These taps and dies can be purchased at any plumbers/engineers stockist fairly cheaply.

[QUOTE="donwatson, post: 76371, member: 503"] I don't have a Zeus book to hand, (liar, I found it ) but I reckon a 1/8th BSP tap and die set would give a pretty good thread. 1/8th BSP tapping drill 8.75mm (0.3445") thread pitch 26 TPI (26 threads per inch about 0.035" pitch). Barrel o/d 13/32" (0.406", 10.30mm). 1/4 BSP is about 1/2"O/D Don W PS These taps and dies can be purchased at any plumbers/engineers stockist fairly cheaply. [/QUOTE]

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