JIS Flanges Bolts Nuts

Overview

Engineering reference data for JIS Flanges Bolts Nuts in piping systems.

Key Formulas

Continuity

$A_1 v_1 = A_2 v_2$

Mass conservation in pipe flow.

Pressure Drop

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Darcy-Weisbach equation.

Pipe Area

$A = \frac{\pi D^2}{4}$

Cross-sectional area of a pipe.

Variables

Symbol	Description	Unit
$D$	Pipe diameter	m
$v$	Flow velocity	m/s
$\Delta P$	Pressure drop	Pa
$f$	Friction factor	—

JIS Standards by Engineering Division

The Japanese Industrial Standards (JIS) for flanges, bolts, nuts, and gaskets are organized by engineering divisions under the Japanese Standards Association (JSA).

B. Mechanical Engineering

Fasteners:

Standard	Description
JIS B 1189:1999	Hexagon flange bolt
JIS B 1190:1999	Hexagon nuts with flange

Shaft Couplings:

Standard	Description
JIS B 1451:1991	Rigid flanged shaft couplings
JIS B 1452:1991	Flexible flanged shaft couplings

Pipe Flanges - Calculation Basis:

Standard	Description
JIS B 2205:1991	Basis for calculation of pipe flanges
JIS B 2206:1995	Basis for calculation of aluminum alloy pipe flanges
JIS B 2207:1995	Basis for calculation of aluminum alloy pipe flanges with full face gasket

Pipe Flanges - Dimensions:

Standard	Description
JIS B 2220:2004	Steel pipe flanges
JIS B 2239:2004	Cast iron pipe flanges
JIS B 2240:1996	General rules for copper alloy pipe flanges
JIS B 2241:1986	Basic dimensions of aluminum alloy pipe flanges
JIS B 2290:1998	Vacuum technology — Flange dimensions
JIS B 2291:1994	21 MPa slip-on welding pipe flanges for hydraulic use

Hydraulic Flanges:

Standard	Description
JIS B 2292-1	Inch series shown in metric units
JIS B 2292-2	Two-and four-hole flanges and shaft ends — Metric series
JIS B 2292-3	Polygonal flanges (including circular flanges)

Gaskets:

Standard	Description
JIS B 2404:1999	Dimensions of gaskets for use with pipe flanges

F. Shipbuilding

Standard	Description
JIS F 7381:1996	Bronze 5K flanged cocks
JIS F 7804:2000	5K copper alloy pipe flanges for marine use
JIS F 7805:1976	Basic dimensions of steel flanges for marine exhaust gas pipe
JIS F 7806:1996	Ships' 280K and 350K socket welding pipe flanges
JIS F 0602:1995	Non-asbestos gaskets for cargo piping system
JIS F 7102:1997	Piping system in machinery space — Gaskets and packings

Other Divisions

Division	Standard	Description
Automotive	JIS D 3631:1998	Fuel injection nozzle holders — Size "S"
Automotive	JIS D 3701:1987	Carburetor flanges for automobiles
Metallurgy	JIS G 3223:1988	High tensile strength steel forgings for tower flanges
Miscellaneous	JIS Z 1604:1995	Plugs and flanges for steel drums

Pressure Rating Standards

The 5K, 10K, 20K, and 40K designations in Japanese marine standards refer to pressure classes in kgf/cm². For reference:

$1 \text{ kgf/cm}^2 = 98.0665 \text{ kPa} \approx 0.098 \text{ MPa}$

Common marine pressure classes:

• 5K: ~0.49 MPa (low pressure applications)
• 10K: ~0.98 MPa (standard duty)
• 20K: ~1.96 MPa (medium pressure)
• 40K: ~3.92 MPa (high pressure hydraulic)

References

• Original Source