Butt Weld Tube to Metric Female O-Ring Adapter 2WE

Why This Butt Weld Tube to Metric Female O-Ring Adapter 2WE Passes the Compliance Gate

The butt weld tube to metric female O-ring adapter 2WE terminates a welded steel tube run in a metric female O-ring face seal port, so a male stud end can be threaded straight into the end of the line. The tube side is a plain weld preparation that is butt welded to the tube, and the female end holds an O-ring in a groove in its face, which is compressed against the flat face of the mating male stud end. There is no thread sealant anywhere in the joint.

Eleven codes pair tube outside diameters from 6 mm to 38 mm with female threads from M12X1.25 to M45X2. The order code reads tube first and thread second, which is the opposite of the male weld series, so check the order of the two size blocks before you order.

Core Advantages

1. Welded tube line with a female port at the end – on this butt weld tube to metric female O-ring adapter 2WE a tube run can accept a male stud end without an intermediate nipple.
2. Eleven codes from 6 mm to 38 mm tube – female threads from M12X1.25 up to M45X2 for the metric sizes used on mobile and industrial equipment.
3. O-ring face seal at the female end – the O-ring sits in a groove in the female face and seals against the mating stud face, so no tape or sealant is used.
4. One fewer threaded joint in the circuit – welding the tube to the adapter removes a threaded connection, which is the usual source of weeping on vibrating machines.
5. Carbon steel with plated finish – bodies are machined from carbon steel and supplied with a protective plated finish as standard practice.

Technical Specifications

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

The butt weld tube to metric female O-ring adapter 2WE is a straight fitting whose first end is a plain weld preparation that is butt welded to a hydraulic tube, and whose second end is a metric female thread with an O-ring groove machined in its face. The O-ring is compressed between the face of this adapter and the flat face of the mating male stud end.

The butt weld tube to metric female O-ring adapter 2WE is not a female-to-female coupler and it is not a cone seat fitting. The female end must be matched to a male stud end of the same thread and the same sealing system, and the weld end must be matched to the tube outside diameter in the matrix.

Connection 1 – Tube Side W: Butt Weld Tube End

Connection 2 – Port Side E: Metric Female O-Ring Face Seal End

This series is not supplied with a tabulated O-ring size, unlike the male stud series. Give us the mating stud standard when ordering and the seal will be confirmed to match it, or order the seal separately to your own port standard.

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. For every code the weld end diameter D matches the tube outside diameter printed for that code.

Note the last line of the matrix: code 2WE-38-52 is listed with an M45X2 female thread, so the second block of that one code does not read as the thread nominal size. Confirm the thread on your enquiry, and we will state the exact thread in the quotation.

Thread Size and Dash Chart

Material and Heat Treatment

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

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.

Pressure data for the butt weld tube to metric female O-ring adapter 2WE can be issued against ISO or SAE requirements on request. State the tube size, wall thickness and grade when ordering.

Temperature Range

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.

How to Read the Part Number Matrix

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

The prefix 2WE means that the first end is a butt-weld tube end and the second end is a metric female O-ring face seal end. The tube block is written first and the thread block second, which is the reverse of the male weld series; reading the blocks in the wrong order will select the wrong part.

Two warnings are worth repeating. The first block is a tube diameter and the second is a thread size, so the two are never the same number by accident. On the largest code the printed thread does not follow the same numbering pattern as the rest of the series, so quote the thread explicitly.

Selection and Ordering

Selection Checklist / Decision Table

Cross Reference Service

Send a photograph of the worn fitting, a rubbing of the female thread, or the old order code from your own system, and the size of this butt weld tube to metric female O-ring adapter 2WE will be converted free of charge. Measure both the tube outside diameter and the female thread, and state which male stud end has to fit. 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.

Packaging and Logistics

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm the female thread and pitch, and check that the mating male stud end uses the same O-ring face seal system.
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 female face 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, and let the part cool naturally.
6. Clean the weld, fit a new O-ring in the face groove, screw the male stud end in by hand, and tighten to the standard torque.

Torque and Sealing Notes

Tightening torque at the female end is taken from the applicable standard data table for the thread size. The O-ring needs only enough compression to seat the two faces together, so excessive torque adds nothing except stress on the thread.

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 the face groove during welding will be destroyed. Never use thread tape or liquid sealant on the female end.

Installation Warnings

• Remove the O-ring from the face groove before welding.
• Cut the tube square and deburr both ends before fitting.
• Weld only to a qualified procedure, by a qualified welder.
• Check the female thread against the mating male stud before assembly.
• 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 assemble the joint without the face groove O-ring in place.
• Never use the adapter to pull two misaligned tube ends together.
• Never fit a cone seat male stud into this female O-ring end.
• Never pressure test the joint before the weld has cooled and been inspected.

Applications and Industries

Tube-run termination in a female port. A welded line can accept a male stud end from a hose assembly or a valve take-off directly, without an extra adapter.

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 entire line.

Hydraulic test benches. Welded tube runs are common on test rigs, and this adapter gives the run a female port that is easy to break and remake.

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

OEM Customization and Quality Traceability

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 mating stud.

FAQ

Q: What screws into the female end of this adapter? A: A male stud end of the same metric thread that uses the same O-ring face seal system, such as a metric male O-ring stud end on a hose assembly or a valve take-off.

Q: Why is no O-ring size listed in the matrix? A: This series is supplied without a tabulated seal size. Give us the mating stud standard with your enquiry and the seal will be confirmed to match it, or order the seal to your own port standard.

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.

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

Q: How do I read the two size blocks in the code? A: The first block is the tube outside diameter in millimetres and the second is the female thread size code, so 2WE-18-27 is an 18 mm tube with an M27X1.5 female end.

Q: Which material and finish are supplied as standard? A: Carbon steel bodies with a plated finish are standard practice. Stainless steel, zinc-nickel plating and high-temperature seal compounds 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 um orçamento

To quote this butt weld tube to metric female O-ring adapter 2WE accurately, send five items: the tube outside diameter, wall thickness and grade, the female thread and pitch, the mating male stud end standard, 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 Hydraulic Adapters range for the complete family, or contact us to request a quote, mill test reports, and samples.