PRODUCT FEATURES
Welding Barrel Nipple — Product Features
This product is manufactured from seamless stainless steel tubing (not cast), ensuring uniform wall thickness and reliable strength under high pressure. The weld ends are pre-beveled for direct butt-welding to piping, eliminating the need for additional grinding or preparation on-site. The external threads are precision-machined via CNC, compliant with the ASME B1.20.1 standard; when tightened to the appropriate torque, they create a secure metal-to-metal seal.
Product Feature
Standard-grade SS304 stainless steel offers excellent rust resistance, making it suitable for general piping systems, compressed air systems, and outdoor environments. For applications involving marine conditions, saltwater, or mild chemical media—where higher corrosion resistance is required—SS316 is recommended.
Product Feature
This fitting simplifies the connection between welded piping and threaded components, removing the need for complex transition assemblies. It is widely used in process skids, hydraulic lines, instrument manifolds, water treatment systems, and marine piping applications.
OPERATING PRINCIPLE
How Welding Barrel Nipple Works
The beveled end is permanently attached to the stainless steel pipe via a butt weld, while the male-threaded end can be screwed directly into internally threaded fittings, valves, or instruments. This connection method provides a clean, compact transition from a welded piping system to threaded components, eliminating the need for additional adapters.
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Operation 1
Notes
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Operation 2
Apply a thread sealant or PTFE (Teflon) tape to the threaded connection. Before installation, ensure that material compatibility, operating pressure, and temperature meet the required specifications. All welding operations must be performed in accordance with standard pipe welding procedures.
ENGINEERING DATA
Technical Specifications
Technical data supplied for Welding Barrel Nipple. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| Specification | Item：TOE Nipple / Welded Threaded Nipple |
| Specification | Material：SS304 / SS316 |
| Specification | Thread：NPT (BSPT /BSPPoptional) |
| Thread Standard | ASME B1.20.1 |
| Pipe Standard | ASTM A312 |
| Design | One end male thread, one end butt-weld beveled end |
| Wall Schedule | SCH40 / SCH80 |
| Size Range | 1/8″ ~ 4″ |
| Surface Pickled | passivated |
| Construction | Seamless stainless steel tube |
MECHANICAL DIMENSIONS
Dimensions & drawings.
Compare connection size with the corresponding overall length, bore and handle clearance dimensions from the supplied drawing.
Dimension chart
| SIZE | L | d | D |
|---|---|---|---|
| 1/2 | 27 | 16.3 | 20.3 |
| 3/4 | 29 | 22 | 26 |
| 1 | 32 | 28 | 32 |
| 11/4 | 36 | 36.4 | 41 |
| 11/2 | 38 | 41.8 | 47 |
| 2 | 40 | 54.4 | 59 |
| 2-1/2 | 45 | 70 | 76 |
| 3 | 50 | 81 | 89 |
| 4 | 50 | 106 | 114 |
Refer to the supplied dimension chart.
APPLICATIONS
Applications
Applicable media: the supplied document lists the following fluids. Actual compatibility depends on selected materials, concentration, temperature, pressure and the specific service conditions.
Application – Water Circulation
Cooling water, circulating water, drinking water and neutral purified water.
Application – Steam Piping
Clean, low-temperature saturated steam, subject to the product’s confirmed temperature and pressure limits.
Application – Compressed Air
Compressed air and nitrogen; verify compatibility for each system.
PURCHASING SUPPORT
Frequently Asked Questions
Find answers to common questions about sizing, materials, threaded connections and operating conditions.
What is Welding Barrel Nipple?
Welding Barrel Nipple (short: Weld single male nipple / TOE nipple, Threaded One End) is a pipe nipple with one end male thread, the other end for butt-weld / socket weld connection**. The welded end is fused to the pipe, the male threaded end connects to threaded fittings, valves or instruments. Made from seamless pipe, sizes range 1/8” ~ 4”, widely used in industrial piping, HVAC, water, gas and instrument lines.
What thread standard can you provide for overseas projects?
NPT (ASME B1.20.1) is standard for North American market. BSPT, BSPP available for European / Middle East orders. Threads are machined and inspected with calibrated thread gauges before shipment.
What material grades are available?
-Stainless steel: ASTM A182 F304 / F304L / F316 / F316L
All raw material can be supplied with MTC Mill Test Certificate, PMI material verification report for buyer traceability requirement.
Pressure rating & wall thickness (SCH)?
Standard SCH40 / SCH80 as default. Pressure rating follows ASME B16.11 forged threaded fitting class: 2000#, 3000#, 6000# optional, depends on schedule and material. Working temperature range: -20℉ ~ 800℉ (varies with material).
What are the thread standards?
It supports BSPT, BSPP (G), or NPT standards. Please specify the required thread type when ordering.
What is the size range?
1/8″ to 4″.
What documents & certificates can you provide for customs and site acceptance?
– MTC Mill Test Certificate (ASTM material traceability)
– PMI material inspection report
(need pre-order, extra cost & lead time).
Which standards does this nipple comply with?
– Thread: ASME B1.20.1
– Weld end & dimensions: ASME B16.11 / ASTM A733
– Raw pipe material: corresponding ASTM specs.
> Distinction: This is pipe-machined nipple, different from fully forged threadolet. If your spec requires forged branch connection, we can quote threadolet separately.
Can we mark identification on the nipple body?
Yes. Laser marking on body: size, SCH, material grade, pressure class, heat/lot number, manufacturer logo. Marking format can follow your drawing or project specification.
What is the Minimum Order Quantity (MOQ)?
Small-batch orders are accepted, and different sizes can be mixed within a single order.
What is the lead time?
Typically, shipments are dispatched within 7–15 days of receiving the deposit, depending on the order quantity.
Installation notes?
Weld end to be fully welded onto matching pipe. Apply PTFE tape or pipe sealant only on male thread. Do not over-torque the thread end, to avoid thread galling or crack. Can be mounted on horizontal or vertical piping.
What Incoterms can be offered for overseas buyers?
FOB China port,We prepare commercial invoice, packing list, bill of lading for import customs declaration.
What Incoterms can be offered for buyers?
FOB China port, CIF. We prepare commercial invoice, packing list, bill of lading for customs declaration.
What to do if there is thread defect or non-conformity after arrival?
Please provide photos, video and inspection records. We will evaluate root cause; available solutions include replacement, partial refund, or supplement shipment, subject to contract terms.
Welding Barrel Nipple
Stainless Steel TOE Nipple (Threaded One End). One end MNPT, one pre-beveled butt weld end. Seamless tube, SS304 / SS316, SCH40/SCH80. ASME B1.20.1 NPT threads. Perfect transition fitting between welded piping and threaded instruments, valves and gauges. Custom lengths and OEM marking supported.
Type: Threaded HEX Bushing
Material: 201/304/316L stainless steel
Nominal diameter: 1/8”–4” (D6–DN100)
Rated pressure: 1.6 MPa (PN16)
Connection type: Threaded connection (BSPT / BSPP / NPT)
