Metric Male O-Ring Butt Weld Tube Adapter 1EW

Why This Metric Male O-Ring Butt Weld Tube Adapter 1EW Passes the Compliance Gate

The metric male O-ring butt weld tube adapter 1EW is a straight adapter with a metric male O-ring stud end on one side and a butt-weld tube end on the other, so a machined manifold or valve port can be connected directly to a welded steel tube line. The O-ring end seals in the port without thread sealant, while the weld end is joined to the tube by a full-penetration butt weld, which removes one threaded joint and one potential leak path from the circuit.

Tube connections cover 6 mm to 42 mm outside diameter in twelve codes, matched to metric threads from M12X1.25 to M52X2. Each code pairs the port thread with the tube diameter, so the two size blocks in the order code tell you the whole interface.

Ventajas principales

1. Port thread and tube diameter in one part – on this metric male O-ring butt weld tube adapter 1EW the O-ring end is a metric stud end and the other end is a weld preparation sized to the tube.
2. Twelve codes from 6 mm to 42 mm tube O.D. – threads from M12X1.25 to M52X2, covering small pilot lines and large main lines.
3. One fewer threaded joint – welding the tube directly to the adapter removes a threaded connection, which is the usual source of weeping joints on vibrating equipment.
4. O-ring sealing at the port – the adapter still seals with an elastomer O-ring at the shoulder, so no thread tape or sealant is used.
5. Carbon steel with plated finish – bodies are machined from carbon steel and supplied with a protective plated finish as standard practice.

Especificaciones técnicas

What Is a Metric Male O-Ring Butt Weld Tube Adapter?

The metric male O-ring butt weld tube adapter 1EW is a straight fitting whose first end is a metric male stud end sealed by an O-ring in a shoulder groove, and whose second end is a plain weld preparation that is butt welded to the end of a steel tube. It is not a weld nipple for a socket weld, and it is not a cone seat fitting adapted to tube.

The adapter is used when a tube run has to terminate at a threaded port. The weld end is machined to match the tube outside diameter in the table below, and the joint is made by the welder, so the quality of the finished connection depends on the welding procedure as much as on the fitting. ISO 6149 defines the port and the O-ring stud end.

Connection 1 – Port Side E: Metric Male O-Ring Stud End

Connection 2 – Tube Side W: Butt Weld Tube End

The weld end must be matched to the tube outside diameter in the matrix. A tube of a different diameter, or a tube with an unsuitable wall thickness or material, cannot be joined by simply welding it to this adapter, and the joint should be qualified to the user’s own welding procedure.

Dimensional Data

Full Dimension Table (Part Number Matrix)

All dimensions are in millimetres and are transcribed from the published spec sheet for this series. The letter X in a thread callout is the pitch separator, so M12X1.25 means a 12 mm nominal metric thread with a 1.25 mm pitch, and the O-ring numbers are the inside diameter and the cross-section in millimetres. For every code, the weld end diameter D matches the tube outside diameter printed for that code.

Confirm the weld end against the actual tube before ordering, particularly at the larger sizes, and check that the tube wall thickness and grade suit the working pressure of the circuit.

Thread Size and Dash Chart

Material y tratamiento térmico

These values describe standard practice for this series rather than a customer-specific qualification. Plating inside or next to a weld preparation can affect weld quality, so tell us if the weld zone must be supplied unplated or masked, and the part will be quoted accordingly.

Working Pressure and Operating Envelope

This series is supplied without a single published pressure rating, because the working pressure is governed by the port standard together with the tube or hose grade selected, and the finished assembly is only as strong as its weakest member. On a welded adapter the tube wall and the weld itself are usually the deciding factors, not the fitting body.

Pressure data for the metric male O-ring butt weld tube adapter 1EW can be issued against ISO or SAE requirements on request. State the tube size, wall thickness and grade when ordering so that the correct grade is confirmed.

Rango de temperatura

Continuous service temperature is typically -40 °C to +120 °C for a nitrile O-ring in a steel body, and it is set by the sealing element and by the tube or hose in the circuit. Higher temperature service calls for a fluorocarbon elastomer, available on request.

Cómo interpretar la tabla de referencias

The order code has three blocks: the series prefix, the port thread size, and the tube diameter.

The prefix 1EW means that the first end is a metric male O-ring stud end and the second end is a butt-weld tube end. The second block is the metric thread size code without the pitch, and the third block is the tube outside diameter in millimetres, written as a two-digit code.

Two warnings are worth repeating. The last block is a tube diameter, not a thread size, so 1EW-22-14 is a 14 mm tube on an M22X1.5 port. A metric thread size can also exist in the cone seat systems, so the size code alone is never enough to order safely.

Selección y pedido

Selection Checklist / Decision Table

Servicio de referencias cruzadas

Send a photograph of the worn fitting, a rubbing of the thread, or the old order code from your own system, and the size of this metric male O-ring butt weld tube adapter 1EW will be converted free of charge. Measure the old tube outside diameter as well as the thread, because both blocks appear in the code. We quote and supply under the HENGHUA and Globhose brands only; we do not copy or re-brand another manufacturer’s product, and we do not print another company’s part number on any component.

Embalaje y logística

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm the port preparation against ISO 6149 and check the thread and pitch against the code.
2. Measure the tube outside diameter and confirm it matches the code and dimension D.
3. Cut the tube square, deburr it inside and out, and check the end for ovality.
4. Remove the O-ring from the adapter before welding, or shield it from heat, so that the elastomer is not damaged.
5. Tack, align and complete the butt weld to your qualified welding procedure, then allow the part to cool naturally.
6. Clean the weld, refit a new O-ring, thread the adapter into the port by hand, and tighten to the standard torque.

Torque and Sealing Notes

Tightening torque at the port end is taken from the applicable standard data table for the thread size, not from a rule of thumb. The O-ring needs only enough compression to seat the shoulder against the port face.

Welding heat is the main risk to this part. Zinc plating and any residual oil or paint in the weld zone can contaminate the weld, and an O-ring left in place during welding will be destroyed, so remove or protect the seal. Never use thread tape or liquid sealant on the O-ring end.

Advertencias sobre la instalación

• Remove or shield the O-ring before welding.
• Cut the tube square and deburr both ends before fitting.
• Weld only to a qualified procedure, by a qualified welder.
• Check the weld end diameter D against the tube before welding.
• Clean the weld zone free of oil, paint and plating residues before striking an arc.

• Never weld a tube of a different diameter to this adapter.
• Never leave the O-ring fitted while welding.
• Never use the adapter to pull two misaligned tube ends together.
• Never fit the O-ring end into a cone seat port.
• Never pressure test the joint before the weld has cooled and been inspected.

Applications and Industries

Tube-run termination at a port. A welded tube line can be terminated directly at a manifold or valve port without adding a threaded joint.

Vibration-prone circuits. Welded joints do not loosen under vibration, which suits mobile equipment and engine-driven hydraulic systems.

Repair and replacement. A damaged tube end can be re-terminated with a new adapter instead of replacing the whole line.

Hydraulic test benches. Welded tube runs are common on test rigs, and this adapter provides the port interface at the end of the run.

Oil and gas, and industrial plant. Welded tube is standard on skid-mounted power units, presses and machine tools, and the plated steel body suits normal industrial environments.

Industry tags: hydraulic adapter, metric O-ring fitting, butt weld tube adapter, weld-on fitting, ISO 6149, tube to port adapter, mobile hydraulics, oil and gas, industrial machinery, repair and maintenance.

Personalización OEM y trazabilidad de la calidad

Private-label marking, laser marking of your own part number, non-standard plating, stainless bodies, unplated weld zones, special O-ring compounds and made-to-drawing geometries are available on this series. Send a drawing or a sample and a quotation with lead time is returned within 24 hours.

Traceability is handled at batch level: heat number on the label, material test report on request, and third-party inspection such as BV or SGS can be arranged. Hydraulic assemblies are pressure tested as part of the normal flow, and the adapter is one link in a chain that also includes the tube, the weld and the port.

Preguntas frecuentes

Q: Can this adapter be welded to a tube of a different diameter? A: No. The weld end diameter of the metric male O-ring butt weld tube adapter 1EW is matched to the tube outside diameter printed in the matrix, and a mismatched tube cannot be joined reliably.

Q: Does the weld end come with a pressure rating? A: No single figure applies. Working pressure is governed by the port standard together with the tube grade selected, and the finished assembly is only as strong as its weakest member, which is usually the tube wall or the weld.

Q: Should the O-ring be fitted during welding? A: No. Remove the O-ring before welding, or shield it from the heat, because welding temperature will damage the elastomer.

Q: What about the plating at the weld zone? A: Plating next to a weld preparation can affect weld quality. Tell us if the weld zone must be supplied unplated or masked, and the part will be quoted accordingly.

Q: How do I read the last two digits of the code? A: They are the tube outside diameter in millimetres, so 1EW-22-14 uses a 14 mm tube, while the 22 refers to the M22X1.5 port thread.

Q: Which material and finish are supplied as standard? A: Carbon steel bodies with a plated finish and nitrile O-rings are standard practice. Stainless steel, zinc-nickel plating and high-temperature elastomers are available on request.

Q: How is the part packed and how fast can it ship? A: Thread protectors and anti-corrosion film, inner bag and export carton, with a batch label carrying the heat number. Standard sizes generally ship in batches in around seven days.

Solicitar un presupuesto

To quote this metric male O-ring butt weld tube adapter 1EW accurately, send five items: the port thread and pitch, the tube outside diameter, wall thickness and grade, the welding standard or procedure you will use, the material and finish required, and the quantity with the required delivery date. Where the original part is unknown, send a photograph or a sample and the size will be identified for you.

Quotations are returned within 24 hours, including lead time and packaging details for your destination. Bulk quantities, mixed size containers and private-label marking are all supported.

Browse the full Adaptadores hidráulicos range for the complete family, or contact us to request a quote, mill test reports, and samples.