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MARYLAND METRICS
THREAD DATA CHARTS

BRITISH STANDARD BRASS (BSB)


Brass Pipe Screw Threads (Whitworth Form 55 Deg Thread Angle)
Thread Form Data
Diameter Outside Diameter inch Core Pitch Depth Radius Effective Dia T.P.I. Double depth thread Root Diameter Tapping drill
1/8" 0.125 0.0757 0.03846 0.0246 -- 0.102 26 0.0493 0.0757 # 47
1/4" 0.250 0.2007 0.03846 0.0246 -- 0.2254 26 0.0493 0.2007 # 6
3/8" 0.375 0.3257 0.03846 0.0246 -- 0.3504 26 0.0493 0.3257 Letter Q
1/2" 0.500 0.4507 0.03846 0.0246 -- 0.4754 26 0.0493 0.4507 29/64"
5/8" 0.625 0.5657 0.03846 0.0246 -- 0.6004 26 0.0493 0.5657 37/64"
3/4" 0.750 0.7007 0.03846 0.0246 -- 0.7254 26 0.0493 0.7007 45/64"
7/8" 0.875 0.8257 0.03846 0.0246 -- 0.8504 26 0.0493 0.8257 53/64"
1" 1.000 0.9507 0.03846 0.0246 -- 0.9754 26 0.0493 0.9507 61/64"
1-1/8" 1.125 1.0757 0.03846 0.0246 -- 1.1004 26 0.0493 1.0757 1-5/64"
1-1/4" 1.250 1.2007 0.03846 0.0246 -- 1.2254 26 0.0493 1.2007 1-13/64"
1-1/2" 1.500 1.4507 0.03846 0.0246 -- 1.4754 26 0.0493 1.4507  1-29/64"
Dimensions in Inches except where stated
Notes: Because brass tubing has a uniform wall thickness, regardless of the tube diameter,
any threading (external or internal), would have to have the same thread depth, so 26 TPI is standard on all diameters.
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