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" |
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.
Click here to return to the thread data chart page index.
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