Like 228


Whitworth pipe thread

In the case of Whitworth pipe threads, a distinction is made between the connections sealing in the thread
(according to ISO 7/1 or DIN EN 10226) and purely mechanical connections without sealing properties
(according to DIN ISO 228).

Comparison of Whitworth Pipe Thread Types


G (BSP)RpRcR.
standardISO 228 part 1ISO 7/1
DIN EN 10226/1
ISO 7/1
DIN EN 10226/2
ISO 7/1
DIN EN 102261+ 2
Type of connectionNot in the thread
sealing connection
Sealed in the thread
end connection
Sealed in the thread
end connection
Sealed in the thread
end connection
inner threadcylindricalcylindricalconical (1:16)Rp or Rc
External threadcylindricalR. (conical)R. (conical)conical (1:16)

G (BSP)
British Standard Pipe DIN ISO 228
Cylindrical pipe thread for connections not sealing in the thread

G (BSP)Outside Ø
in inches
Outside Ø
in mm
Gears each
inch
Slope P
in mm
G 1/8 "0,3839,730280,907
G 1/4 "0,51813,160191,337
G 3/8 "0,65616,660191,337
G 1/2 "0,82520,950141,814
G 5/8 "0,90222,910141,814
G 3/4 "1,04126,440141,814
G 7/8 "1,18930,200141,814
G 1 "1,30933,250112,309
G 1 1/8 "1,49237,900112,309
G 1 1/4 "1,65041,910112,309
G 1 3/8 "1,74544,320112,309
G 1 1/2 "1,88247,800112,309
G 1 3/4 "2,11653,740112,309
G 2 "2,34759,610112,309
G 2 1/4 "2,58765,710112,309
G 2 1/2 "2,96075,180112,309
G 2 3/4 "3,21081,530112,309
G 3 "3,46087,880112,309
G 3 1/4 "3,70093,980112,309
G 3 1/2 "3,950100,330112,309
G 3 3/4 "4,200106,680112,309
G 4 "4,450113,030112,309

Please note:
The outside diameter of 1 "inch pipe thread is 33.25 mm (not 25.4 mm)!
Historically, this can be explained by the fact that at the beginning of the 20th century pipes with an inner diameter of 1 "inch
had an outer diameter of approximately 33 mm for manufacturing reasons.




The thread diameters and pitches match between G (BSP), Rp, Rc and R, respectively.
The differences are that G (BSP) is cylindrical and non-sealing, Rp is cylindrical and
is sealing. Rc is conical and sealing. The matching external thread for Rp and Rc is the R thread,
which is also conical and sealing. RP, RC and R also differ in the tolerances
compared to G (BSP).
G (BSP)P
Gg / "
p
[mm]
A-Ø
d = D
Fl-Ø
d2 = D2
Core Ø
d1 = D1
Rp / Rc
R.
a
[mm]
Internal thread tolerance
Fl-Ø U
[mm]
tolerance
External thread
U mm
1/16280,9077,7237,1426,5611/164± 0,071± 1.1/4± 1± 0,9
1/8280,9079,239,1478,5661/84± 0,071± 1.1/4± 1± 0,9
1/4191,33713,15712,30111,4451/46± 0,104± 1.1/4± 1± 1,3
3/8191,33716,66215,80614,9503/86,4± 0,104± 1.1/4± 1± 1,3
1/2141,81420,95519,79318,6311/28,2± 0,142± 1.1/4± 1± 1,8
5/8141,81422,91121,74920,587





3/4141,81426,44125,27924,1173/49,5± 0,142± 1.1/4± 1± 1,8
7/8141,81430,20129,03927,877





1112,30933,24931,77030,291110,4± 0,18± 1.1/4± 1± 2,3
1.1/8112,30937,89736,41834,939





1.1/4112,30941,91040,43138,9521.1/412,7± 0,18± 1.1/4± 1± 2,3
1.1/2112,30947,80346,32444,8451.1/212,7± 0,18± 1.1/4± 1± 2,3
1.3/4112,30953,74652,26750,788





2112,30959,61458,13556,656215,9± 0,18± 1.1/4± 1± 2,3
2.1/4112,30965,71064,23162,752





2.1/2112,30975,18473,70572,2262.1/217,5± 0,216± 1.1/2± 1.1/2± 3,5
2.3/4112,30981,53480,05578,576





3112,30987,88486,40584,926320,6± 0,216± 1.1/2± 1.1/2± 3,5
3.1/2112,309100,30098,85197,372





4112,309113,030111,551110,072425,4± 0,216± 1.1/2± 1.1/2± 3,5



Internal thread Rp (cylindrical) and external thread R (conical) - sealing connection


R.

 

 

Internal thread Rc (conical) and external thread R (conical) - sealing connection