Description
BSPT Taps HSS (High Speed Steel)
55 degree Whitworth Thread Form. Whitworth Pipe Threads are used almost exclusively by countries which are otherwise on the metric system.
“Rc: Series British Standard Pipe – Taper- BSPT Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread. 1:16 Tapered Thread. Taper is 3/4″ taper per foot ( 1 in 16 on the diameter) Various Symbols: BSPT, BSPTr, PT, KR, Rc.
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Suggested tap drill sizes for BSPT taps
|
Nominal Size |
T P I |
Major Diameter |
Tapping Drill Size |
|
BSPT |
|||
|
1/16 |
28 |
0.304 |
|
|
1/8 |
28 |
0.383 |
8.4mm |
|
21/64″ |
|||
|
1/4 |
19 |
0.518 |
11.2mm |
|
7/16″ |
|||
|
3/8 |
19 |
0.656 |
14.75mm |
|
37/64″ |
|||
|
1/2 |
14 |
0.825 |
18.25mm |
|
23/32″ |
|||
|
5/8 |
14 |
0.902 |
|
|
3/4 |
14 |
1.041 |
23.75mm |
|
15/16″ |
|||
|
7/8 |
14 |
1.189 |
|
|
1 inch |
11 |
1.309 |
30mm |
|
1-11/64″ |
|||
|
1-1/4″ |
11 |
1.650 |
38.5mm |
|
1-33/64″ |
|||
|
1-1/2″ |
11 |
1.882 |
44.5mm |
|
1-3/4″ |
|||
|
1-3/4″ |
11 |
2.116 |
|
|
2″ |
11 |
2.347 |
56mm |
|
2-3/16″ |
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