Technical information

Process connection per EN 837
WIKA data sheet IN 00.03

Applications■ For the definition of the process connections for WIKA

pressure measuring instruments

Variants■ Process connections with parallel thread

Connection shankparallelFlat gasket per EN 837 or WIKA
sealing■ Process connections with tapered thread■ Industry-specific special connections

Tapped hole parallel

Installation example with parallel thread

Description

Connection shanktapered

WIKA offers pressure measuring instruments with a variety
of process connections in order to meet diverse customerspecific application requirements.
For pressure measuring instruments with parallel or tapered
thread, process connections with a range of dimensions arespecified.
The permissible maximum pressure of a process connection is a result of the combination of thread size and material.
The correlation is illustrated for a selection of representative
process connections in a table on page 3.

WIKA data sheet IN 00.03 ∙ 04/2022

Tapped hole tapered

Installation example with tapered thread

Page 1 of 5Connection shank with parallel male thread
Parallelthread
GDimensions in mmd2d3

f withBrassg-0.2

l1
+0.3

l2
±0.1l3+0.3G ⅛ 1)

2)8Stainlesssteel2)

2)

2)

102)

8M10 x 12)

82)

2)

2)

102)

8G ¼ 1)

59.52

3

11132

11M12 x 1.5

5

9.5

2

3

9.7

13

2

11G⅜

5.5

132

3

14.5

163

13G ½ 1)

617.5

34

1820

3

17M20 x 1.5

617.5

34

17.7

20

3171) Preferably with WIKA standard versions
2) With WIKA, without centring spigot; thread run-out instead of thread undercut

Centring spigot

Connection shank with tapered thread
Tapered thread
GSW:Square, hexagon orspanner flats, for size,see respective data
sheet

Dimensions inmm
l1min.

⅛ NPT, R ⅛

10¼ NPT, R ¼

13⅜ NPT, R ⅜

15½ NPT, R ½

19

Tapped hole with parallel female thread
Parallel female threadG

Dimensions in mm

G ⅛ 1)

t1
-0.5

t2
min.

7.54.5 3)

10

13

10

5.5

13

16.5

M12 x 1.5

9.5

5.5

1316.5

bmin.

d4

7.5

4.4 3)

M10 x 1G ¼ 1)

1013G⅜126.5

1619.5G ½ 1)

15

71924.5

M20 x 1.515.571924.51) Preferably with WIKA standard versions3) Can be omitted with WIKA instruments since without centring spigot

Standards for threads
Parallel threads:

Tapered threads:

Pipe threads, code G, per ISO 228-1
Metric ISO threads, code M, per DIN 13

Pipe threads, code NPT, per ANSI / ASME B1.20.1
Pipe threads, code R, per ISO 7

WIKA data sheet IN 00.03 ∙ 04/2022

Page 2 of 5

Maximum allowable pressure
Thread 1)

Maximum allowable pressure 2)

G⅛

400

6,000400barpsi

G¼

600

8,600

1,000

G⅜

600

8,6001,000

G½

1,000

15,000M10 x 1400

M12 x 1.5400

M20 x 1.5
⅛ NPT, R ⅛

Cu alloybar

psiStainless steel

Monel®
barpsi

15,0001,000

15,00015,0001,000

15,0002,500

36,0002,500

36,000

6,000

400

6,000

400

6,000

6,000

400

6,000

400

6,000

1,000

15,0002,500

36,0002,500

36,000

400

6,000

400

6,000

400

6,000

¼ NPT, R ¼

600

8,600

1,000

15,0001,000

15,000⅜ NPT, R ⅜

600

8,600

1,000

15,0001,000

15,000½ NPT, R ½

1,000

15,0001,600

23,0001,600

23,000

7/16-20 UNF400

6,000800

12,000800

12,0006,0004006,0001) Valid for the thread standards for connection shanks and female threads mentioned on page 2.
2) The specified values for the maximum pressure are rounded values and are assigned to the nearest standard scale range.

Examples of industry-specific process connections
Hydraulic connection
with 74° sealing cone SAE J 514

Refrigeration connection
with 90° sealing cone SAE J 513

High-pressure process connection(HP) for connection with lens-type
sealing ring, per EN 837

Hose connection

High-pressure process connection
per Autoclave Engineering or Nova
Swiss M16 x 1.5 female

Other process connections on request

WIKA data sheet IN 00.03 ∙ 04/2022

Page 3 of 5

Examples of other tapped holes
Version per DIN EN ISO 1179-2 (sealing with profile sealing)G¼

G½

G 1 ½ 1)
Order number: 2158982

M12 x 1.5

M14 x 1.5

M18 x 1.5

Version per SAE J 514

Version per ANSI / ASME B1.20.1
¼ NPT

½ NPT

7/16-20 UNF

G ½, with O-ring 1) 2)

G 1, with O-ring 1) 2)
Order number: 1192264
G 1, with sealing cone
Order number: 1524380

Flush WIKA version
G ¼, with O-ring 2)

G 1, EHEDG 1) 2) 3)
Order number: 2166011

1) Also available as welding socket from WIKA.
2) The screw-in holes made by the customer must be drilled out after thread cutting.
3) European Hygienic Engineering & Design Group
WIKA makes every effort to ensure that the screw-in holes shown are kept up-to-date. The corresponding current regulations
are applicable for the production of the screw-in hole.
We reserve the right to make technical changes to the WIKA versions for screw-in holes and welding sockets.

WIKA data sheet IN 00.03 ∙ 04/2022

Page 4 of 5

04/2022 EN© 09/2000 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.

WIKA data sheet IN 00.03 ∙ 04/2022

Page 5 of 5WIKA Alexander Wiegand SE & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/GermanyTel.
+49 9372 132-0
info@wika.de
www.wika.de