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Keywords: Pipe End Cap, Pipe Steel Cap, Standard Steel Pipe Cap, Strong Steel Pipe Cap

Size: NPS from 1/2'' to 48'', DN from 12 to 1200,WT: 2-80mm, SCH 40/80/XXS

Material:

Carbon Steel --- ASTM A234 WPB ANSI B 16.9, DIN 2606 N-5 ST.37.0;

Stainless Steel --- ASTM 403 304/304L, 316/316L,316Ti,321,317L,310S;Alloy Steel --- ASTM A234 WP 1/5/9/11/12/22/91Bend Radius: 2.5D/3D/4D/5D/6D/7D/8D/9D/10D

Delivery: BKS, NBK,BK ,BKW, GBK(+A), NBK(+N), BK(+C)

Packing: Packed in Wood Cabins/ Wood Tray

Application: Petroleum, Electricity, Chemicals, Natural Gas, Construction, Shipbuilding And Other Fields Because Of Its High Pressure, High Temperature, Etc

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FAQ

Pipe Caps act as protective device and are designed to protect pipe ends of various shapes. The main purpose of using pipe caps is to waterproof the connections. They are also used to close the the ends of hydraulic or pneumatic pipes and tubes. They are used in the plumbing apparatus of domestic, commercial and industrial water supply lines, machinery and processing equipment etc. They are also fitted on water pump lines with the sole purpose of removing air blocks. Pipe caps are highly demanded as an important category of pipe fittings.Steel Pipe Cap is also called Steel Plug, it usually welded to the pipe end or mounted on the external thread of the pipe end to cover the pipe fittings. To close the pipeline so the function is the same as the pipe plug.

Types of Pipe Caps:

Pipe caps come in many different types and the type vary according to the application. However pipe caps also vary depending on their construction features and it is very important for the buyer to know the right type of pipe cap. Based on construction, pipe caps are of the following types:

Threaded Caps:

These caps are female threaded. The thread can be either straight or tapered, also referred as NPT. Generally, caps have a female thread and plugs have a male thread.

Tapered Caps:

These caps have tapered sides, which offers a close fit. Some of these fittings can be used either as a cap or a plug. Tapered caps and plugs are multi-functional and go well with male and female NPT threads, straight tubes and bars; and male straight threads. These fittings have a tapered body to provide a secure and firm friction fit while facilitating easy removal. The tapered caps are designed to provide protection for all internal and external, threaded and non-threaded fittings against damage, dirt or moisture that can occur.

Anti-Roll Caps:

These caps are round in shape with a slightly square end. This prevents pipes and tubes from rolling.

BW Steel Cap:

BW steel pipe cap is the butt weld type of fittings, connecting methods is to use butt welding. So BW cap ends in beveled or plain.

Socket Weld Steel Pipe Cap

Socket weld cap is to connecting pipes and caps by insert the pipe into the access shoulder area of the socket weld cap.

Pipe Cap Material Grades

Stainless Steel Pipe Cap	ASTM A403 WP Gr. 304, 304H, 309, 310, 316, 316L, 317L, 321, 347, 904L
Carbon Steel Pipe Cap	ASTM A 234 WPB , WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70.
Low Temperature Carbon Steel Pipe Cap	ASTM A420 WPL3, A420 WPL6
Alloy Steel Pipe Cap	ASTM / ASME A/SA 234 Gr. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91
Duplex Pipe Cap	ASTM A 815, ASME SA 815 UNS NO S31803, S32205. Werkstoff No. 1.4462
Nickel Alloy Pipe Cap	ASTM / ASME SB 336 UNS 2200 ( NICKEL 200 ), UNS 2201 (NICKEL 201 ), UNS 4400 (MONEL 400 ), UNS 8020 ( ALLOY 20 / 20 CB 3, UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600 ), UNS 6601 ( INCONEL 601 ), UNS 6625 (INCONEL 625), UNS 10276 ( HASTELLOY C 276 )

Standards :ASME / ANSI – B 16.9, ASTM A403 – ASME SA403, ASME B16.9, ASME B16.25, ASME B16.28, MSS SP-43.

Dimension : ANSI B16.9, ANSI B16.28, MSS-SP-43 Type A, MSS-SP-43 Type B, JIS B2312, JIS B2313

Size : Seamless Reducer ( 1/2″～24″), ERW / Welded / Fabricated Reducer (1/2″～48″)

Thickness : Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc.

Form : Pipe End Caps, Pipe Caps, End Caps.

Types : Seamless / Welded / Fabricated

END CAPS DIMENSIONS :

ANSI 16.9 DIMENSIONS BUTTWELD END CAPS

inches	mm	Height
inches	mm	D	E
1/2	15	21,34	25,40
3/4	20	26,67	31,75
1″	25	33,40	38,10
1 1/4	32	42,16	38,10
1 1/2	40	48,26	38,10
2	50	60,32	38,10
2 1/2	65	73,02	38,10
3	80	88,90	50,80
3 1/2	90	101,60	63,50
4	100	114,30	63,50
5	125	141,30	76,20
6	150	168,27	88,90
8	200	219,07	101,60
10	250	273,05	127,00
12	300	323,85	152,40
14	350	355,60	165,10
16	400	406,40	177,80
18	450	457,20	203,20
20	500	508,00	228,60
22	550	558,80	254,00
24	600	609,60	266,70
28	700	711,20	266,70
Dimension in mm

ANSI 16.9 TOLERANCES

DIMENSIONAL TOLERANCES – CAPS
For all fittings				Caps
Nominal Pipe Size (NPS)	Outside Ø at Bevel	Inside Ø at End	Wall Thickness t / t1	Overall Length E
1/2 a 2 1/2	1	0,8	Not	4
3 a 3 1/2	1	1,6	less	4
4	+2 -1	1,6	than	4
5 a 6	+3 -1	1,6	87,50%	7
8	2	1,6	of nominal	7
10	+4 -3	3,2	tickness	7
12 a 18	+4-3	3,2		7
20 a 24	+6-5	4,8		7
26 a 30	+7 -5	4,8		10
32 a 48	+7 -5	4,8		10

BUTT WELD CAPS – WEIGHTS

WEIGHTS OF FITTINGS
NPS inches	CAPS
NPS inches	Sch. 5S	Sch. 10S	Sch. 40S	Sch. 80S
1/2	0.04	0.04	0.05	0.05
3/4	0.05	0.05	0.06	0.08
1	0.09	0.09	0.13	0.17
1 1/4	0.11	0.11	0.15	0.18
1 1/2	0.15	0.15	0.20	0.22
2	0.17	0.17	0.25	0.30
2 1/2	0.25	0.25	0.45	0.50
3	0.40	0.40	0.70	0.90
4	0.60	0.60	1.20	1.60
5	1.00	1.00	1.90	2.70
6	1.40	1.40	2.90	4.30
8	2.50	2.50	5.10	7.60
10	3.90	3.90	9.00	12.0
12	6.50	6.50	13.5	17.5
14	8.00	8.00	16.0	20.5
16	14.5	14.5	20.5	26.0
18	17.0	17.0	26.0	34.0
20	18.0	18.0	32.0	43.0
24	26.0	26.0	46.0	60.0
Approximate weights in kg, density 8 kg/dm3

Stainless Steel End Pipe Cap : ASTM A403 WP316/316L, ASTM A403 WP304/304L, ASTM A182 F316L, 304L, DIN 1.4301, DIN1.4306, DIN 1.4401, DIN 1.4404

Alloy Steel End Pipe Cap : ASTM / ASME A/SA 234 Gr. WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91

Duplex & Super Duplex Steel End Pipe Cap : ASTM A 815, ASME SA 815 UNS NO S31803, S32205. UNS S32750, S32950. Werkstoff No. 1.4462

Carbon Steel End Pipe Cap : ASTM A 234 WPB , WPBW, WPHY 42, WPHY 46, WPHY 52, WPH 60, WPHY 65 & WPHY 70.

Nickel Alloy End Pipe Cap : ASTM / ASME SB 336 UNS 2200 ( NICKEL 200 ), UNS 2201 (NICKEL 201 ), UNS 4400 (MONEL 400 ), UNS 8020 ( ALLOY 20 / 20 CB 3, UNS 8825 INCONEL (825), UNS 6600 (INCONEL 600 ), UNS 6601 ( INCONEL 601 ), UNS 6625 (INCONEL 625), UNS 10276 ( HASTELLOY C 276 ).

Light Oiling, Black Painting

Surface treatment:

Transparent oil, rust-proof black oil or hot galvanized.

Special design available All the production process are made according to ISO9001:2000 strictly.

Based on different materials, pipe caps include carbon steel cap, stainless steel cap, and alloy steel cap etc.

Depending on their construction, pipe caps contain threaded cap, tapered cap and anti-roll cap etc.

Our products like end cap are packaged to make sure that there’s no damage throughout transit. Just in case of exports, customary export packaging is completed in wooden boxes or cases. All end cap are marked with Trademark (Company’s LOGO), Grade, Size and Lot No. On requests we can do custom marking on our products.

What types of Steel Pipe Fittings do you supply?

We supply a comprehensive range of steel pipe fittings designed to connect, control, change direction, or branch off piping systems. Our main product categories include:
Elbows (90°, 45°, 180°): Used to change the direction of the pipe flow.
Tees (Equal, Reducing): Used to combine or split fluid flow.
Reducers (Concentric, Eccentric): Used to connect pipes of different diameters.
Caps: Used to seal the end of a pipe.
Couplings & Unions: Used to connect two pipes in a straight line.
Crosses: Four-way fittings used in fire sprinkler systems and other specific applications.
We manufacture these fittings in various materials including Carbon Steel, Stainless Steel (304/316), and Alloy Steel.

What standards and specifications do your fittings meet?

Our steel pipe fittings are manufactured in strict compliance with international standards to ensure compatibility and safety in global projects. Key standards include:
ASME/ANSI B16.9: Factory-made wrought buttwelding fittings.
ASME/ANSI B16.11: Forged fittings, socket-welding, and threaded.
MSS SP-75: Specification for high-test, wrought, buttwelding fittings.
DIN / EN: European standard fittings (e.g., DIN 2605, DIN 2616).
JIS B2311/B2312: Japanese Industrial Standards.
GB/T 12459: Chinese national standard for steel pipe fittings.

What is the difference between Buttweld, Socket Weld, and Threaded fittings?

Choosing the right connection type is critical for your piping system's integrity:
Buttweld Fittings: Welded directly to the pipe. They provide a permanent, leak-proof connection and are ideal for high-pressure and high-temperature applications. They are commonly used in industrial pipelines.
Socket Weld Fittings: The pipe is inserted into a recessed area of the fitting before welding. These are typically used for small-bore piping (usually under 2 inches) and high-pressure systems where disassembly is not required.
Threaded (Screwed) Fittings: These have internal or external threads and are screwed onto the pipe. They are easy to install and disassemble, making them suitable for low-pressure water lines or maintenance-heavy areas, but not recommended for high vibration or high temperature environments.

What materials are available for your fittings?

We offer fittings in a wide range of grades to suit different environments:
Carbon Steel: ASTM A234 WPB (most common for general use), WPC, and low-temperature carbon steel (ASTM A420 WPL6).
Stainless Steel: ASTM A403 WP304/L, WP316/L, WP310, WP321, etc., ideal for corrosive environments and food processing.
Alloy Steel: ASTM A234 WP11, WP22, WP91, designed for high-temperature and high-pressure service (e.g., power plants).
Duplex & Super Duplex: For extreme corrosion resistance applications (offshore oil & gas).

Do you offer custom manufacturing or OEM services?

Yes, we specialize in both standard and custom manufacturing.
OEM Services: We can produce fittings according to your specific drawings or samples, including non-standard sizes or special beveling.
Custom Coatings: We can apply epoxy coating, galvanization, or oil varnish based on your project's corrosion protection requirements.
MOQ: For standard items, we have flexible MOQs. For custom forged or machined parts, the Minimum Order Quantity (MOQ) depends on the complexity of the production run.