Metric Thread with Captive Seal Adapter 1CM-WD/1DM-WD

Why This Metric Thread with Captive Seal Adapter 1CM-WD/1DM-WD Passes the Compliance Gate

The metric thread with captive seal adapter 1CM-WD/1DM-WD is a straight stud-end adapter whose stud end carries its own elastic sealing ring on the stud face. That ring, identified by a WD seal code, is captive: it stays on the adapter through handling, storage and repeated service, so the joint does not depend on a loose washer being picked up at assembly time.

• Stud end: metric male thread, M12X1.5 to M52X2, with a captive WD elastic seal matched to the port size.
• Tube end: metric male thread, M10X1 to M48X2, for metric tube from 6 mm to 42 mm outside diameter.
• Pressure groups from the drawing: 31.5 MPa and 16 MPa (light series L), 63 MPa and 40 MPa (heavy series S), 31.5 MPa on the largest heavy series S row.

Ventajas principales

1. Captive seal, not a loose washer: the WD ring sits in the stud-end face seat and cannot drop off, so a blind or inverted assembly cannot be closed without its seal.
2. WD seal code selection: every row names its seal code (WD-B02, WD-M12, WD-M16, WD-M18, WD-M20, WD-M22, WD-B04, WD-B12, WD-B16, WD-B20, WD-B24), so the correct ring is specified by the drawing, not guessed in the field.
3. Flat-face port compatibility: this series is the right choice when the port has a machined flat spot face and no 60 degree cone cut into it.
4. Repeatable service: renewing the ring is a shop-floor action on the adapter itself, which keeps the machine’s port in service instead of re-cutting a seat.
5. Light and heavy series in one matrix: 26 catalogue rows cover light series L and heavy series S with the full dimensional set B, l1, L1, S1 and S2 on every row.
6. Batch traceability: mill test reports, dimensional inspection reports and pressure test records are available per production batch on request.

Especificaciones técnicas

What Is a Metric Thread Adapter with Captive Seal?

The metric thread with captive seal adapter 1CM-WD/1DM-WD is a one-piece machined steel adapter with a metric male stud end and a metric male tube end. Its distinguishing feature is the WD elastic sealing ring carried on the stud-end face, which is compressed against the flat port face when the stud end is tightened. The ring is captive by design, so it is a retained component of the adapter rather than a separate consumable that travels loose in a bag.

An ISO 6149 O-ring stud end is a different family, since it seals with an O-ring trapped at the base of the thread. This series does not use that arrangement and must not be substituted for an ISO 6149 stud end, or for a 60 degree seat stud end.

How This Differs from the 1CM/1DM 60 Degree Seat Series

Practical selection rule: read the port first. If the port is cut with a 60 degree cone, use the 1CM/1DM series. If the port is flat-faced and a captive elastic seal is preferred, use the 1CM-WD/1DM-WD series with the seal code that matches the port size.

Connection 1: Metric Male Stud End with Captive WD Seal (E)

Connection 2: Metric Male Thread for Metric Tube Nut (F)

Dimensional Data

Full Dimension Table (Part Number Matrix)

All dimensions in millimetres. Every row is transcribed from the current 1CM-WD/1DM-WD drawing, including the seal code column.

Reading the table: the WD suffix marks the captive seal version, the SEAL column fixes the ring that must be fitted for that row, and the pressure group applies to the row as a whole.

Thread and Seal Code Chart

The seal code is the selection key on this series. Two rows can share the same stud thread and still need different rings, so always order by seal code as well as by thread.

Material y tratamiento térmico

Working Pressure and Operating Envelope

Working pressure is set by the pressure group of the row selected, together with the tube system and hose assembly the adapter is fitted into.

The finished assembly is only as strong as its weakest member, so tube, tube nut, ferrule or cone and hose must be rated at or above the row’s group. (1 MPa is approximately 145 psi.)

Rango de temperatura

Cómo interpretar la tabla de referencias

The code for the metric thread with captive seal adapter 1CM-WD/1DM-WD is the base 1CM or 1DM number followed by the letters WD. Prefix tells you the series, the first number block is the stud thread, the second number block is the tube-end thread, and WD confirms that a captive seal is fitted on the stud end.

• Prefix 1CM = light series; prefix 1DM = heavy series.
• The WD suffix means captive seal on the stud end, so a base row and its WD version are not the same part.
• The seal code is not written into the part number, so always read the SEAL column in the matrix.

Example 1: 1CM-12-10WD = light series, stud end M12X1.5, tube end M10X1, D1 6 mm, seal WD-B02, 31.5 MPa group.

Example 2: 1CM-16-18WD = light series, stud end M16X1.5, tube end M18X1.5, D1 10 mm, seal WD-M18, 31.5 MPa group. Compare it with 1CM-16-14WD, which shares the stud thread but needs seal WD-B04.

Example 3: 1DM-22-20WD = heavy series, stud end M22X1.5, tube end M20X1.5, D1 14 mm, seal WD-M20, 63 MPa group.

Selección y pedido

Ordering the metric thread with captive seal adapter 1CM-WD/1DM-WD is a four-step check: identify the port thread, confirm the port face is flat and machined, read the seal code for that port size, then match the tube end and pressure group.

Selection Checklist and Decision Table

Servicio de referencias cruzadas

Send a photo or dimension sketch of the adapter you are replacing, together with the port size if it is known. We measure the stud thread, the tube-end thread, the stud-end seal seat and the B, l1, L1, S1 and S2 dimensions, then map the part to a WD row of the metric thread with captive seal adapter 1CM-WD/1DM-WD matrix and its seal code, free of charge. We do not copy or re-badge another manufacturer’s part number.

Embalaje y logística

Installation and Fitment Guide

Step-by-Step Assembly

1. Check the part number, the seal code and the tube size against the order before opening the packaging.
2. Clean the port face and thread. A flat spot face with swarf, paint or a burr cannot seal against the ring.
3. Verify the captive ring is seated squarely in its groove on the stud end, and renew it if it is cut, flattened or hardened.
4. Screw the stud end in by hand until the ring meets the port face, then torque to the value for that thread size and material class.
5. Assemble the tube nut and ferrule or cone on the tube end and tighten to the tube system torque table.
6. Pressurise gradually and check both ends for weeping before the machine returns to service.

Torque and Sealing Notes

• Use the torque table for the exact thread size, material class and finish involved, taken from the applicable standard data sheet or the drawing supplied with the order. One blanket figure does not apply across the whole matrix.
• The captive ring seals against the flat port face. Excess torque extrudes and cuts the ring, after which no further tightening will stop the leak.
• Do not fit a bonded seal washer in front of the captive ring; the two sealing elements stack and the joint will not seat correctly.
• Check the ring after every disassembly. A ring that has taken a compression set should be replaced, not reused.
• Where a joint weeps despite correct torque, check the port face flatness and the B insertion depth before increasing torque.

Advertencias sobre la instalación

• Do not fit this series to a port with a 60 degree machined seat; use the 1CM/1DM 60 degree seat or bonded seal series instead.
• Do not substitute an ISO 6149 O-ring stud end, even when the thread appears to match.
• Do not omit the captive ring or replace it with a plain O-ring of the wrong size.
• Do not force a tapered thread into a straight metric port, and do not use a straight metric stud in a tapered port.
• Do not machine the stud end to change the insertion depth; order the correct row instead.
• Do not exceed the pressure group of the selected row.

Applications and Industries

Flat-face capture ports on imported machinery: machines built to metric practice frequently use a flat spot-faced port, and the captive ring is the practical way to seal it on a production line.

Blind and inverted assembly positions: because the seal cannot fall off, this series suits manifold ports facing downward or hidden behind other components.

Repair and replacement: when a machine is down, the seal code column lets a maintenance team confirm the ring as well as the adapter in one step.

High-pressure test benches: the 63 MPa and 40 MPa rows suit rigs that must hold pressure with a captive, serviceable seal.

Oil and gas equipment: valve packages, actuator lines and skids with metric flat-face ports.

Construction and mining machinery: cylinders and hose runs that must stay serviceable in the field.

Industrial plant: machine tools, presses and hydraulic power units where light series rows cover most tube work.

Industry tags: hydraulic adapter, captive seal, metric stud end, WD seal code, DIN 2353, ISO 8434-1, tube adapter, hydraulic fitting.

Personalización OEM y trazabilidad de la calidad

We manufacture hydraulic adapters and hose assemblies and support OEM programs with private labelling and laser marking of your own part number on the hex or shank. Custom finishes, captive seal compounds, special lengths and non-standard seal seats are quoted from your drawing or sample, usually within 24 hours.

Each production batch is traceable. Parts pass a 100 percent pressure test before packing, and mill test reports, dimensional inspection reports and pressure test records can travel with the shipment. Third-party inspection such as BV or SGS can be arranged. Our manufacturing system is certified to ISO 9001:2015 and ISO 18752.

Preguntas frecuentes

Q: What does the WD suffix mean?

A: WD identifies the captive seal version of the base 1CM or 1DM row. The stud end carries an elastic sealing ring in its face seat instead of relying on a 60 degree cone contact or a separate bonded seal washer.

Q: Can I use this metric thread with captive seal adapter 1CM-WD/1DM-WD in a port that already has a 60 degree seat?

A: No. A 60 degree seat port is designed for cone contact and needs the 1CM/1DM 60 degree seat series. This series is intended for flat, machined spot faces.

Q: How do I choose the seal code?

A: Read the SEAL column on the row that matches your stud thread and tube size. For example, 1CM-16-18WD requires WD-M18 while 1CM-16-14WD on the same stud thread requires WD-B04.

Q: What pressure can the captive seal version take?

A: The drawing groups the rows at 31.5 MPa and 16 MPa for light series L, 63 MPa and 40 MPa for heavy series S, and 31.5 MPa on the largest heavy series S rows.

Q: Should I use a bonded seal washer with this adapter?

A: No. The captive ring is the sealing element. Adding a bonded seal washer stacks two seals and prevents the stud end from seating correctly on the port face.

Q: How often should the captive ring be replaced?

A: Replace it whenever it is cut, flattened or hardened, and at every service where the joint has been opened and the ring shows compression set. Spare rings can be ordered with the adapters.

Q: What material and plating are standard?

A: Carbon steel with zinc plating and trivalent passivation is typical, with stainless steel and alternative seal compounds available on request.

Q: What are your lead times?

A: Standard rows ship as a typical 7-day batch, custom sampling is available in about 48 hours for new drawings, and urgent quantities can move by air freight.

Solicitar un presupuesto

Send us the port thread, the port face type (flat spot face), the seal code or the port diameter, the tube outside diameter and the quantity. With those details we confirm the right row of the metric thread with captive seal adapter 1CM-WD/1DM-WD matrix, check the pressure group and material, and return a quotation within 24 hours.

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