Saturday, January 24, 2015

British Pipe Threads


Taps / drill sizes

"G: Series British Standard Pipe - Parallel ( Straight ) BSP or BSPF

Also referred to as British Gas, British Pipe Parallel or Parallel Fastening thread.

Various Symbols: BSP, BSPP, BSSPI, BSPF, BSPG, PS, R, G.

Taps Marked " G Size I.S.O."


"Rc: Series British Standard Pipe - Taper- BSPT

Also referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread.

Taper is 3/4" taper per foot ( 1 in 16 on the diameter)

Various Symbols: BSPT, BSPTr, PT, KR, Rc.

Taps Marked " Rc Size I.S.O."


BSP British Straight and Taper Pipe Taps
BSP and BSPT
Nominal Size
(inches)
T P I
Major Diameter
(inches)
1/8"
28
0.383
1/4"
19
0.518
3/8"
19
0.656
1/2"
14
0.825
5/8"
14
0.902
3/4"
14
1.041
7/8"
14
1.189
1"
11
1.309
1-1/4"
11
1.650
1-1/2"
11
1.882
1-3/4"
11
2.116
2"
11
2.347
2-1/4"
11
2.587
2-1/2"
11
2.960
3"
11
3.460

 

suggested tap drill sizes

British Standard Pipe
Parallel or Taper
BSP or BSPT
Nominal Size
(inches)
T P I
Major Diameter
(inches)
Tapping Drill Size
Tapping Drill Size
BSP
BSPT
1/16
28
0.304
6.6 mm
Letter drill G
1/8
28
0.383
8.8 mm
8.4mm
11/32 inch
21/64"
1/4
19
0.518
11.8 mm
11.2mm
29/64"
7/16"
3/8
19
0.656
15.25 mm
14.75mm
19/32"
37/64"
1/2
14
0.825
19.00mm
18.25mm

3/4"
23/32"
5/8
14
0.902
21 mm
53/64"
3/4
14
1.041
24.5 mm
23.75mm
31/32"
15/16"
7/8
14
1.189
28.25 mm
1-7/64"
1 inch
11
1.309
30.75 mm
30mm
1-13/64"
1-11/64"
1-1/4"
11
1.650
39.50 mm
38.5mm
1-35/64"
1-33/64"
1-1/2"
11
1.882
45.5 mm
44.5mm
1-25/32"
1-3/4"
1-3/4"
11
2.116
51.00 mm
2"
2"
11
2.347
57 mm
56mm
2-1/4"
2-3/16"

 

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