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27Aug/14Off

BSB Threads – British Standard Brass

BRASS THREADS (British Standard Brass)

BSB - Brass threads are used for brass tubing with a uniform wall thickness regardless of the tube diameter. 26 Threads per inch is the standard on all tube diameters.

The reason for using 26 tpi, is brass tube has a almost the same wall thickness irrespective of the outside diameter of the tube, therefore as BSW thread depths are determined by the threads per inch, a lower tpi would reduce the strength of the tube or cut right through it.

 
The included thread angle on all BSB threads is 55 degrees

Nominal sizes range from 18 to 2 inches.
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Thread Form Data Tapping Hole
Diameter O/D Core Pitch Depth Radius Effective Dia T.P.I Dec / Met / Frac
1/8" 0.125 0.0757 0.03846 0.0246 -- 0.1020 26 Number 47
1/4" 0.250 0.2007 0.03846 0.0246 -- 0.2254 26 Number 6
3/8" 0.375 0.3257 0.03846 0.0246 -- 0.3504 26 Letter Q
1/2" 0.500 0.4507 0.03846 0.0246 -- 0.4754 26 29/64"
5/8" 0.625 0.5657 0.03846 0.0246 -- 0.6004 26 37/64"
3/4" 0.750 0.7007 0.03846 0.0246 -- 0.7254 26 45/64"
7/8" 0.875 0.8257 0.03846 0.0246 -- 0.8504 26 53/64"
1" 1.000 0.9507 0.03846 0.0246 -- 0.9754 26 61/64"
1-1/8" 1.125 1.0757 0.03846 0.0246 -- 1.1004 26 1-5/64"
1-1/4" 1.250 1.2007 0.03846 0.0246 -- 1.2254 26 1-13/64"
1-1/2" 1.500 1.4507 0.03846 0.0246 -- 1.4754 26 1-29/64"

BSB Threads - British Standard Brass

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