BSP thread stud end O-ring sealing adapter 1CG/1DG | Metric to G Thread, 6 mm to 42 mm Tube

Why This BSP thread stud end O-ring sealing adapter 1CG/1DG Passes the Compliance Gate

The BSP thread stud end O-ring sealing adapter 1CG/1DG is a straight fitting with a metric male stud end at connection E and a BSP parallel male stud end with O-ring sealing at connection F. The metric end runs from M12x1.5 to M52x2, and the BSP end is tabulated with its thread size and thread pitch, from G1/8″X28 to G2″X11. The pressure column is printed per row together with the series code, 31.5 MPa and 16 MPa for the light L rows and 63 MPa, 40 MPa and 31.5 MPa for the heavy S rows, so the class travels with the part number.

This is the adapter for mixed-standard equipment, where a metric port on one side of a circuit meets a BSP ported component on the other. It is the BSP member of the same straight fitting family as the light and heavy series straight adapter, which means a maintenance store can hold one series of bodies and cover both port standards.

Core Advantages

1. One part covers two thread standards. Metric stud end at E, BSP parallel stud end at F, tabulated with its thread pitch in every row.
2. O-ring sealing at the BSP end. The BSP stud end seals on the port spotface with an O-ring instead of relying on thread sealant.
3. Thirty-seven tabulated rows. Every combination of metric end, BSP end and tube size is listed with its own B, I1, L1, S1 and S2 values.
4. Pressure class printed per row. 31.5 MPa, 16 MPa, 63 MPa, 40 MPa and 31.5 MPa, matching the light L and heavy S classes of the family.
5. Documented, traceable supply. Batch traceability, dimensional records and material test reports support incoming inspection.
6. OEM marking. Laser marking of your part number, logo and batch code is available on the body or the hex.

Technical Specifications

What Is a BSP thread stud end O-ring sealing adapter 1CG/1DG?

It is a straight adapter that changes thread standard, from a metric male stud end at E to a BSP parallel male stud end at F, with the tube outside diameter D1 and the pressure class of the row defining the duty. The BSP end seals with an O-ring on the spotface of the mating BSP port, which is why the series is described as O-ring sealing.

It is not a tapered BSP fitting and it is not an ISO 6149 metric O-ring fitting. A tapered thread relies on thread deformation to seal and needs a different port preparation, while an ISO 6149 stud end seals on a machined flat face inside the port. Check the port callout and the thread pitch before ordering, because G threads of the same nominal size exist in different pitches, as the table shows.

Connection 1 – Metric male stud end (E)

Connection 2 – BSP parallel male stud end with O-ring sealing (F)

Dimensional Data

Full Dimension Table (Part Number Matrix)

All dimensions are in millimetres and are transcribed row by row from the product data sheet. Thread codes are reproduced as printed, including the BSP pitch: G1/4″X19 means a G1/4 parallel thread of 19 threads per inch, and G1/4″X14 is the 14 threads per inch version of the same nominal size. The pressure column is reproduced exactly as printed, with 31.5 MPa and 16 MPa for the light L rows and 63 MPa, 40 MPa and 31.5 MPa for the heavy S rows.

Thread Size and Dash Chart

Material and Heat Treatment

The values above describe normal commercial practice for this family and are confirmed on the order drawing, not replaced by it.

Working Pressure and Operating Envelope

Working pressure for the BSP thread stud end O-ring sealing adapter 1CG/1DG is read from the pressure column of the matrix, converted where needed at 1 MPa about 145 psi: 31.5 MPa is roughly 4,570 psi, 16 MPa about 2,320 psi, 40 MPa about 5,800 psi and 63 MPa about 9,135 psi. The class printed against each row is the class for the metric and BSP stud ends and the tube range in that same row.

A pressure class is one input only. Both ports and the tube must hold the same class, and the finished assembly is only as strong as its weakest member. Ask for a rating table with your enquiry and we will state the figure, the tube range and the test method that apply to your combination.

Temperature Range

The typical service window is -40 °C to +120 °C for the standard construction, set by the elastomer used at the BSP end rather than by the steel body. Where a different elastomer is fitted, the window follows that material. Confirm the elastomer and the fluid with us before ordering for hot or aggressive service.

How to Read the Part Number Matrix

The order code carries three pieces of information: the series prefix, the metric thread size and the BSP thread size.

1. Prefix – 1CG or 1DG. 1CG identifies the light L series rows, 1DG identifies the heavy S series rows, and the prefix carries the pressure class with it.
2. Middle group – metric thread at E. In 1CG-22-08 the group 22 is the metric stud thread, M22x1.5.
3. Final group – BSP thread at F. The group 08 is the BSP end, G1/2″X14 in this row.

Two examples make the pattern clear. 1CG-14-08 pairs an M14x1.5 metric end with a G1/2″X14 BSP end for 8 mm tube at 31.5 MPa light series, and 1DG-22-08 pairs the same BSP end with a heavy series metric end for 14 mm tube at 63 MPa. The middle and final groups are read together with the prefix, because the same BSP end appears in both the light and the heavy group at different tube sizes.

Selection and Ordering

Cross Reference Service

Send an old part number, a photograph or a worn sample of the BSP thread stud end O-ring sealing adapter 1CG/1DG and we will cross it to the closest row of this matrix. The answer states metric thread, BSP thread with its pitch, tube size, pressure class and hex explicitly so you can verify it against your own measurement, the service is free, and we never re-label another maker’s part as our own.

Packaging and Logistics

Fittings ship in individual bags inside cartons, grouped by part number, with batch code and quantity on the outer label. Mixed cartons are routine for distributors and repair workshops. Material test reports travel with the goods when ordered, standard rows ship quickly from stock, and air freight covers urgent shutdown dates.

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm both thread callouts, including the BSP pitch, and the series against the circuit before starting work.
2. Check the metric port and the BSP spotface for burrs, paint or old sealant, because the O-ring needs a clean flat landing.
3. Fit a new O-ring of the correct size to the BSP stud end, lightly lubricated with a compatible fluid.
4. Thread the metric end in by hand until it seats, then the BSP end, so the fitting is not loaded by misalignment.
5. Tighten both ends to the torque value for each thread size and material from the applicable standard data table.
6. Pressure test the finished assembly at the circuit working pressure and record the result.

Torque and Sealing Notes

Tighten each stud end to the torque values for its own thread size, material and coating from the applicable standard data table, and treat those figures as a starting point to be confirmed against your own test. The BSP end seals with an O-ring on the spotface, so it does not need thread sealant, and tape or paste can force the O-ring out of position. Never mix a tapered BSP fitting with a parallel BSP port, and never use a parallel BSP stud end in a tapered port. Over-tightening does not improve the seal and can stretch the thread or distort the spotface.

Installation Warnings

• ✔ Confirm the metric thread, the BSP thread and its pitch, and the series before fitting.
• ✔ Fit a new O-ring at the BSP end whenever the joint is broken.
• ✔ Check that the BSP port has a sound spotface for the O-ring to seal against.
• ✔ Use a spanner on the correct hex and hold the body steady when breaking a joint.
• ❌ Never fit a parallel BSP stud end into a tapered BSP port, or the reverse: the two sealing principles are different and the joint will not seal correctly.
• ❌ Never substitute an ISO 6149 O-ring port (1CH/1DH rows) or a JIC 74 degree cone port (1CJ/1DJ rows) for the BSP port in this series.
• ❌ Never ignore the pitch: G1/4″X19 and G1/4″X14 are not interchangeable.
• ❌ Never use thread tape or sealant on the O-ring stud thread to stop a weep.

Applications and Industries

The BSP thread stud end O-ring sealing adapter 1CG/1DG appears wherever a metric ported block must connect to a BSP ported component.

• Mixed-standard equipment integration. Imported machines with BSP ports meet locally sourced metric blocks through one part number.
• Repair and replacement. A damaged adapter at a metric-to-BSP junction is replaced with the same row, keeping the pressure class and pitch.
• Test rigs and benches. Instrumentation and gauge lines are re-terminated from metric to BSP without changing the block.
• Industrial plant. Lubrication, cooling and clamp circuits mix metric and BSP components through these adapters.
• Mobile and construction machinery. Heavy S series rows cover the higher pressure circuits while light L rows serve return and pilot lines.

Tags: hydraulic adapter, BSP stud end adapter, G thread hydraulic fitting, metric to BSP adapter, O-ring sealing stud end, light series L, heavy series S, straight hydraulic fitting.

OEM Customization and Quality Traceability

We manufacture matching hydraulic adapters and hose assemblies alongside our hose range, so specials are quoted engineering work rather than a favour. Laser marking of your part number, logo, date code and batch code is available on the body or the hex, and custom finishes, non-standard thread combinations, special body lengths and alternative O-ring elastomers are quoted from your drawing or sample, normally within 24 hours.

Every batch is traceable from raw material to finished part. Batch records, dimensional results and material test reports are available with the goods, third-party inspection such as BV or SGS can be arranged, and finished assemblies are pressure tested with results recorded for the lot. Ordering the BSP thread stud end O-ring sealing adapter 1CG/1DG on a repeat schedule keeps one drawing, one O-ring size and one traceability record behind every mixed-standard joint.

FAQ

Q: What does the number after X in the BSP thread mean? A: It is the thread pitch in threads per inch. G1/4″X19 is a G1/4 parallel thread of 19 threads per inch and G1/4″X14 is the 14 threads per inch version, so the two are not interchangeable even though the nominal size matches.

Q: Does the BSP end need thread sealant? A: No. The BSP stud end in this series seals with an O-ring on the port spotface, so thread sealant is not required and tape or paste can push the O-ring out of position.

Q: Can I use this adapter in a tapered BSP port? A: No. A tapered BSP thread seals by thread deformation in a tapered port, while this stud end is a parallel G thread that seals on a spotface with an O-ring. Use the matching version of the adapter for a tapered port.

Q: What pressure can the BSP thread stud end O-ring sealing adapter 1CG/1DG take? A: Read the pressure class printed for your row: 31.5 MPa or 16 MPa in the light L group and 63 MPa, 40 MPa or 31.5 MPa in the heavy S group. That class applies to the two stud ends and the tube range in the same row, and the finished assembly is only as strong as its weakest member.

Q: Is this adapter the same as the ISO 6149 metric O-ring version? A: No. The 1CH/1DH rows are ISO 6149 metric O-ring stud ends, the 1CJ/1DJ rows are JIC 74 degree cone, and the 1CG/1DG rows carry a BSP parallel stud end with O-ring sealing. The port preparations and the sealing interfaces differ, so they are not interchangeable.

Q: How do I convert the pressure class to psi? A: At 1 MPa about 145 psi, 31.5 MPa is roughly 4,570 psi, 16 MPa about 2,320 psi, 40 MPa about 5,800 psi and 63 MPa about 9,135 psi.

Q: Can you mark our part number on the fitting? A: Yes. Laser marking of part number, logo and batch code is available on the body or the hex, and specials are normally quoted within 24 hours.

Request a Quote

Send the metric thread, the BSP thread with its pitch, the tube outside diameter, the series and pressure class needed, and the material and surface treatment you require. To speed up a quotation on the BSP thread stud end O-ring sealing adapter 1CG/1DG, add the drawing and a photograph of the BSP port spotface. We reply with part number, printed pressure class, confirmed dimensions, price and lead time within 24 hours, and trial samples can be arranged at the same time.

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