ISO ( International Organization for Standardization ) is a worldwide federation of national standards bodies. They developed this standard for stainless steel fittings for threaded connections in accordance with ISO 7-1.

Stainless Steel Fittings ISO 4144

This standard recommend use austenitic stainless steel having the proof stress at least equal to that of steel TS 47 specified in ISO 2604-2, and its equivalent material standards include ASTM A182. But ASTM A182 has so many grades, which one is the material of EN ISO 4144 Threaded Fittings.

The most commonly used Stainless Steel Grades are SS316 and SS304.

Stainless Steel 316L is also a kind of 316 stainless steel with less carbon content of 0.3% max. The primary reason for using an L grade stainless steel is that this will reduce the tendency of the material to crack after welding.

Stainless Steel BSP Fittings 316L

EN ISO 4144 Threaded Fittings are available in BSP types. That shall be in accordance with ISO 7-1 (BSP thread), external and internal threads are tapered 1:16 (BSPT), but internal threads may be parallel (BSPP). Thread ends should be chambered.

BSPP (British Standard Parallel Pipe) is most popular in the UK, Europe, Asia, Australia, New Zealand and South Africa. It is sealed by the bonded seal ring, no thread sealant is needed to form the seal. The thread angle is 55 degree.

BSP Pipe Fittings Pressure

For Forged ASME B16.11 Fittings, 3000# Threaded Fittings seem like the most common type, but BSP pipe fittings EN ISO 4144 have a pressure rating below 3000LB.

Types of EN ISO 4144 Fittings

This standard includes a variety of threaded fittings, such as:

• Elbows (45° and 90°)
• Tees and Crosses
• Couplings and Reducers
• Hex Nipples and Bushings
• Caps and Plugs
• Unions

All fittings are supplied with BSP (British Standard Pipe) threads in accordance with ISO 7-1, ensuring compatibility and easy installation.

Table 1—Types of fittings and their symbols
Diagram	Type	Symbol	Figure
	Elbows,   equal and reducing	E1 and E2	2 and 3
	45°elbows	E3	4
	Male and female elbows	E4	5
	Tees,equal and reducing	T1 and T2	2 and 3
	Crosses	X1	2
	Half sockets	S1	6
	Sockets,   equal and reducing	S2 and S3	7 and 8
	Reducing bushes	B1	9
	Hexagon nipples,    equal and reducing	N1 and N2	10 and 11
	Caps	C1	12
	Plugs	P1 and P2	13
	Unions	U1,U2,U3 U4,U5,U6	14

ASME B16.11 and ISO 4144

Both standard of the size range are 1/8 to 4 inch (DN 6 -100). The difference as following.

Manufacture Technique
Types
Material Range
Thread Type
Pressure Rating

If you have any requirements of forged steel fittings and flanges, whatever ASME B16.11 & BS3799 or EN ISO 4144, we are your first choice.

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