Japanese Flange Application Standard (JIS)

Nominal diameter: DN10~DN1000mm
Pressure level: 8 levels of IOK, 16K, 20K, 30K, 40K, 63K
Flange sealing surface: 5 types: smooth surface, large convex surface, small convex surface, concave and convex surface, tongue and groove surface
Flange type: flat welding (SO), socket welding (SW), butt welding (WN), threaded connection (TH), loose sleeve and flange cover (BL), etc.
Example 1: JIS 21/2 10K flange
JIS Japanese flange standard, 2-1/2 is the international size called NPS; my country is called DN, 65, 10K is the Japanese standard kilogram pressure.
To be accurate: DN65, NPS2-1/2, flange outer diameter 175, inner diameter 77.1 (with steel pipe diameter 76), thickness 18, center circle diameter 140, bolt hole number 4, bolt hole diameter 19, bolt M16, flange approximate The weight is 2.58 kg.
Example 2: JIS 10K SO 1B (RF) flange
JIS Japanese flange standard, 10K should be the pressure resistance, SO is flat welding flange, (RF) means the sealing surface type is convex, 1B is 1 inch is 1 inch pipe.
Note: MPa is usually used in my country, but in the United States, Britain and some European countries, the pressure level (CL) in English units is still used in practical applications, and the “K” level system is implemented in Japanese standards, such as 10K, 20K, etc. The concept of this pressure level system is the same as that of the British pressure level system, but the unit of measurement is the metric system; because the nominal pressure and the temperature reference of the pressure level are different, there is no strict correspondence between the three. The approximate correspondence is:
CL: 150, 300, 400, 600, 900
K level: 10, 20, 30, 45, 65
Nominal pressure PN/MPa: 2.0, 5.0, 6.8, 11.0, 15.0
JIS 10K about 1.37MPa
JIS 20K about 3.33MPa JIS 30K about 4.99MPa JIS 40K about 6.66MPa PN16=1.6MPA

◆The commonly used standards in the Japanese application standard system JIS are:
JIs G3452 general purpose carbon steel pipe
JISG3454 Carbon Steel Pipe for Pressure JISG3455 Carbon Steel Pipe for Pressure JISG3456 Carbon Steel Pipe for High Temperature JISG3457 Arc Welded Carbon Steel Pipe JIS G3458 Alloy Steel Pipe JIs G3459 Stainless Steel Pipe
JIs G3468 arc welding large diameter stainless steel pipe JIS B2201 ferritic material pipe flange pressure class JIS B2202 pipe flange size
JIS B2210 ferrite material pipe flange basic size JISB2220 steel pipe flange
JIS B2302 steel threaded connection pipe fittings
JIS B2311 Steel Butt Welding Fittings for General Purposes JIS B2312 Steel Butt Welding Fittings
JIS B2313 steel plate butt welding pipe fittings JIS B2316 socket welding pipe fittings JIS B2401 O-ring
JIS B2404 Spiral Wound Gasket for Pipe Valve Lan JIS B3453 Compressed Asbestos Gasket

contact us
Have questions or need help? Use the form to reach out and we will be in touch with you as quickly as possible.Don't worry, we won't share your information with anyone else.