Stainless Steel Threaded Pipe Fittings

Stainless steel threaded pipe fittings are pipe fittings that connect pipes to pipes, pipes to valves, and pipes to equipment in pipeline systems through threaded connections. They are convenient to install and disassemble due to their unique threaded connection method, and are widely used in medium and low pressure fluid systems, such as the transportation of water, oil, gas, steam, etc., due to the excellent performance of stainless steel. It has the advantages of easy installation, flexible disassembly, good sealing, and no need for welding.

Stainless Steel Threaded Pipe Fittings Characteristics

1. Corrosion resistance: stainless steel has excellent corrosion resistance to atmospheric corrosion, acid, alkali solution and salt solution.

2. Mechanical strength: It has good mechanical properties, high tensile strength and yield strength.

3. Machinability: It is easy to weld, polish and process into various shapes.

4. Heat resistance: It can be used in high temperature environment below 800℃ and maintain good mechanical properties.

ASME B16.11 Standard Scope

This Standard covers ratings, dimensions, tolerances, marking, and material requirements for forged fittings, both socket-welding and threaded, as illustrated in Tables 1 through 5 and Tables I-1 through I-5, inclusive.

Special Fittings

Fittings with special dimensions, threads, or counterbores may be made by agreement between the manufacturer and purchaser. When such fittings meet all other stipulations of this Standard, they shall be considered in compliance therewith, provided they are appropriately marked.

Welding

Installation welding requirements are not within the scope of this Standard. Installation welding shall be in accordance with the applicable piping Code or regulation covering the piping system into which the fittings are installed.

Fittings under this Standard shall be designated as Class 2000, 3000, and 6000 for threaded end fittings and Class 3000, 6000, and 9000 for socket-weld end fittings.

Stainless Steel Threaded Pipe Fittings — Manufacturing Standards

Standard Code	Standard Name	Region / Organization
ASME B16.11	Forged Fittings, Socket-Welding and Threaded	USA (ASME)
ASTM A182	Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings	USA (ASTM)
EN 10241	Steel threaded pipe fittings	European (EN)
DIN 2999 / DIN EN 10226	Pipe threads where pressure-tight joints are made on the threads (BSPT)	Germany (DIN) / EU
BS 3799	Steel pipe fittings, screwed and socket-welding for the petroleum industry	UK (British Standard)
MSS SP-83	Class 3000 Steel Pipe Unions, Socket-Welding and Threaded	USA (MSS)

Threaded Connection

NPT (National Pipe Taper): This is a national standard tapered pipe thread, more common in the United States and Canada. Its threads have a taper, and the seal is achieved through the self-compression of the threads.

BSPT (British Standard Pipe Taper): This is a British standard tapered pipe thread, similar to NPT but with a 55° thread angle. It's widely used in Europe and Commonwealth countries.

BSPP (British Standard Pipe Parallel): This is a British standard parallel pipe thread. Since the threads are parallel, they require the use of a sealing gasket to ensure a leak-tight seal.

Stainless Steel Threaded Pipe Fitting Specification

Threaded Length:

The length of the threaded portion must comply with NPT standards for a tight, secure fit.

Nominal Pipe Size (NPS):

The NPS is used to designate the size of the forged threaded fittings. For example, a 1/2” fitting has a 1/2” NPS.

Wall Thickness:

The threaded elbows and threaded tees wall thickness must comply with the class designation (2000, 3000, or 6000) to handle the pressure rating associated with that class.

ASTM A182 Stainless Steel Threaded Pipe Fittings Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F304	MIN						8	18
	MAX	0.08	2	0.045	0.03	1	11	20		0.1
ASTM A182 F316	MIN						10	16	2
	MAX	0.08	2	0.045	0.03	1	14	18	3	0.01
ASTM A182 F51	MIN						4.5	21	2.5	0.08
	MAX	0.03	2	0.03	0.02	1	6.5	23	3.5	0.2
ASTM A182 F53	MIN						6	24	3	0.24
	MAX	0.03	1.2	0.035	0.02	0.8	8	26	5	0.32

ASTM A182 Stainless Steel Threaded Pipe Fittings Mechanical Property

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A182 F304	515 min	205 min	30 min	50 min
ASTM A182 F316	515 min	205 min	30 min	50 min
ASTM A182 F51	620 min	450 min	25 min	45 min
ASTM A182 F53	800 min	550 min	25 min	15 min

ASME B16.11 Stainless Steel Threaded Fittings Dimensions

Threaded 45 Elbow			Threaded 45 ° Elbow				Threaded Tee					Threaded Cross
Nominal  Size		Center-to-End						Outside Diameter of Band			Wall Thickness			Length of Thread
DN	NPS	A						H			G min			L5 min	L2 min
		90°   Elbows, Tees, Crosses			45 °  Elbows
		2000	3000	6000	2000	3000	6000	2000	3000	6000	2000	3000	6000
6	1/8 1/4 3/8	21	21	25	17	17	19	22	22	25	3.18	3.18	6.35	6.4	6.7
8	1/4	21	25	28	17	19	22	22	25	33	3.18	3.30	6.60	8.1	10.2
10	3/8	25	28	33	19	22	25	25	33	38	3.18	3.51	6.98	9.1	10.4
15	1/2	28	33	38	22	25	28	33	38	46	3.18	4.09	8.15	10.9	13.6
20	3/4	33	38	44	25	28	33	38	46	56	3.18	4.32	8.53	12.7	13.9
25	1	38	44	51	28	33	35	46	56	62	3.68	4.98	9.93	14.7	17.3
32	1 1/4	44	51	60	33	35	43	56	62	75	3.89	5.28	10.59	17.0	18.0
40	1 1/2	51	60	64	35	43	44	62	75	84	4.01	5.56	11.07	17.8	18.4
50	2	60	64	53	43	44	52	75	84	102	4.27	7.14	12.09	19.0	19.2
65	2 1/2	76	83	95	52	52	64	92	102	121	5.61	7.65	15.29	23.6	28.9
80	3	86	95	106	64	64	79	109	121	146	5.99	8.84	16.64	25.9	30.5
100	4	106	114	114	79	79	79	146	152	152	6.55	11.18	18.67	27.7	33

Coupling			Half-Coupling		Boss			Cap
Nominal Size		End-to-End	End-to-End		Outside Diameter		End Wall		Length of Thread
DN	NPS	W	P		D		G min		L5 min	L2 min
		3000 & 6000	3000	6000	3000	6000	3000	6000
6	1/8	32	19		16	22	4.8		6.4	6.7
8	1/4	35	25	27	19	25	4.8	6.4	8.1	10.2
10	3/8	38	25	27	22	32	4.8	6.4	9.1	10.4
15	1/2	48	32	33	28	38	6.4	7.9	10.9	13.6
20	3/4	51	37	38	35	44	6.4	7.9	12.7	13.9
25	1	60	41	43	44	57	9.7	11.2	14.7	17.3
32	1 1/4	67	44	46	57	64	9.7	11.2	17.0	18.0
40	1 1/2	79	44	48	64	76	11.2	12.7	17.8	18.4
50	2	86	48	51	76	92	12.7	15.7	19.0	19.2
65	2 1/2	92	60	64	92	108	15.7	19.0	23.6	28.9
80	3	108	65	68	108	127	19.0	22.4	25.9	30.5
100	4	121	68	75	140	159	22.4	28.4	27.7	33.0

Square Head Plug		Hex Head Plug		Round Head Plug		Hex Head Bushing		Flush Bushing
Nominal Size		Length		Width Flats		Length		Hex Height
DN	NPS	Amin	B min	C min	E nom	D min	H min	G min	F nom
6	1/8	10	6	7	10	35	6		11
8	1/4	11	6	10	14	41	6	3	16
10	3/8	13	8	11	18	41	8	4	18
15	1/2	14	10	14	21	44	8	5	22
20	3/4	16	11	16	27	44	10	6	27
25	1	19	13	21	33	51	10	6	36
32	1 1/4	21	14	24	43	51	14	7	46
40	1 1/2	21	16	28	48	51	16	8	50
50	2	22	18	32	60	64	18	9	65
65	2 1/2	27	19	36	73	70	19	10	75
80	3	28	21	41	89	70	21	10	90
100	4	32	25	65	114	76	25	13	115

Tolerances for Threaded Fittings

Nominal Size		Elbows,Tees & Crosses	Couplings	Half- couplings
Center-to-End	End-to-End	End-to-End
DN	NPS	A J	W	W/ 2
6~8	1/8~1/4	± 1.0	± 1.0	± 1.0
10~20	3/8~3/4	± 1.5	± 1.5	± 1.5
25~50	1~2	± 2.0	± 2.0	± 2.0
65~100	21/2~4	± 2.5	± 2.5	± 2.5

Common Types of Threaded Fittings

Elbows (90° and 45°) – Used to change pipe direction.

Tees – Allow branching of the pipeline.

Couplings – Connect two pipes together.

Unions – Provide easy disconnection for maintenance.

Bushings – Reduce pipe size.

Nipples – Short sections of threaded pipe.

Caps & Plugs– Seal pipe ends.

Crosses – Four-way connection.

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

- Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

Stainless Steel Threaded Pipe Fitting Exported Countries

We Export stainless steel threaded pipe fitting to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc