BSPT Male Hydraulic Adapter 1CT-SP/1DT-SP (Taper Thread Stud End to Metric Tube End)

Why This BSPT Male Hydraulic Adapter 1CT-SP/1DT-SP Passes the Compliance Gate

The BSPT male hydraulic adapter 1CT-SP/1DT-SP joins a British Standard Pipe Taper port to a metric tube line. The taper stud end screws into an R-series taper port and seals on the threads, while the metric end takes the tube nut for a standard light or heavy series tube.

• Stud end: BSPT male taper thread from R1/8″X28 to R1.1/2″X11, sealed on the thread flanks.
• Tube end: metric male thread from M12X1.5 to M52X2 for metric tube from 6 mm to 42 mm outside diameter.
• Pressure groups from the drawing: 25 MPa and 16 MPa (light series L), 40 MPa and 25 MPa (heavy series S).

Core Advantages

1. Taper thread sealing: the stud end is a BSPT taper (R series) thread that seals by interference along the thread flanks, which is the port practice on a large installed base of European and Asian equipment.
2. BSPT male hydraulic adapter 1CT-SP/1DT-SP matrix: 37 catalogue rows cover eight taper port sizes and nine metric tube sizes, so most combinations can be sourced from one drawing.
3. Metric tube side in the same family: the E end follows DIN 2353 / ISO 8434-1 light series L and heavy series S metric tube practice, avoiding a hybrid hose end.
4. Two pressure families in one chart: light series rows are grouped at 25 MPa and 16 MPa, heavy series rows at 40 MPa and 25 MPa, and every row states its group.
5. Dimensional data for every row: l1, L1, S1 and S2 are listed for each row so that tube nut engagement and hex clearance can be checked before ordering.
6. Batch documentation: mill test reports, dimensional inspection reports and pressure test records are available per production batch on request.

Technical Specifications

What Is a BSPT Male Hydraulic Adapter?

It is a one-piece machined steel adapter with a BSPT taper stud end and a metric male tube end. BSPT stands for British Standard Pipe Taper, the R series thread defined by ISO 7-1, and it seals on the threads themselves as the taper tightens. That is the opposite of a straight thread O-ring joint, which seals on a face chamfer, and it is also different from a metric cone joint, which seals on a 60 degree or 74 degree seat.

A BSPT stud end is not interchangeable with a BSPP parallel thread of the same nominal size. BSPP, the G series, is a straight thread and needs a washer or an O-ring to seal; BSPT does not use a washer and instead relies on thread interference plus a suitable sealant.

Connection 1: BSPT Male Taper Stud End (F)

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

Dimensional Data

Note: this drawing lists no stud-end insertion depth column, so the stud end is controlled by the taper thread itself rather than by a B dimension.

Full Dimension Table (Part Number Matrix)

All dimensions in millimetres. Every row is transcribed from the current 1CT-SP/1DT-SP drawing, with the taper thread designations as printed.

Reading the table: E is the metric tube-end thread matched to the D column, F is the BSPT taper stud thread that matches the port, and the pressure group applies to the whole row. The l1 and L1 cells of row 1CT-12-04SP are not legible on the current drawing extract, so they are marked for confirmation rather than estimated.

Thread Size and Dash Chart

The same taper thread serves several tube sizes, so always order by part number and not by port thread alone.

Material and Heat Treatment

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 joins.

A taper thread joint adds a further limit: the port body must be strong enough to take the wedging load of the taper, so the port material and wall thickness matter as much as the adapter rating at the top of the range. The finished assembly is only as strong as its weakest member. (1 MPa is approximately 145 psi.)

Temperature Range

How to Read the Part Number Matrix

The code reads: series prefix, tube-end thread code, taper port code, and the SP suffix. Prefix gives the series, the first block is the metric tube thread, and the second block is the BSPT port size code.

• Prefix 1CT = light series; prefix 1DT = heavy series.
• First block: metric tube thread nominal diameter (14 = M14X1.5).
• Second block: BSPT port code (02 = R1/8″, 04 = R1/4″, 06 = R3/8″, 08 = R1/2″, 12 = R3/4″, 16 = R1″, 20 = R1.1/4″, 24 = R1.1/2″).
• Suffix SP marks the taper thread stud end family.

Example 1: 1CT-12-02SP = light series, metric tube end M12X1.5 for 6 mm tube, R1/8″X28 BSPT stud end, 25 MPa group.

Example 2: 1CT-16-08SP = light series, metric tube end M16X1.5 for 10 mm tube, R1/2″X14 BSPT stud end, 25 MPa group. Note the L1 of 36.8 and S2 of 19 for this combination.

Example 3: 1DT-42-16SP = heavy series, metric tube end M42X2 for 30 mm tube, R1″X11 BSPT stud end, 25 MPa group.

Selection and Ordering

Ordering the BSPT male hydraulic adapter 1CT-SP/1DT-SP is a four-step check: identify the taper port thread, confirm it is a taper and not a parallel thread, match the metric tube size, then compare the pressure group.

Selection Checklist and Decision Table

Cross Reference Service

Send a photo or a dimension sketch of the adapter being replaced. We gauge the taper thread against R-series data, measure the metric end and record l1, L1, S1 and S2, then map the part to a 1CT-SP/1DT-SP row, free of charge. We do not copy or re-badge another manufacturer’s part number.

Packaging and Logistics

Installation and Fitment Guide

Step-by-Step Assembly

1. Confirm the port thread size, the tube size and the pressure group against your order before opening the packaging.
2. Inspect the port thread for damage. A taper joint cannot seal against a burred or galled port thread.
3. Clean both threads and apply an approved thread sealant to the stud end, leaving the first two threads clear.
4. Screw the stud end in by hand until it seats, then tighten to the torque value for that thread and port material.
5. Hold the stud end at its hex while tightening the tube nut on the metric side so the taper joint is not disturbed.
6. Pressurise gradually and check the taper joint and the tube joint for weeping before the machine returns to service.

Torque and Sealing Notes

• Use the torque table for the exact thread size, port material and finish involved, taken from the applicable standard data sheet or the drawing supplied with the order.
• A BSPT joint seals on the threads, so an approved sealant is required. Select the sealant for the system fluid and temperature.
• Taper threads reach sealing position by interference, so turns are limited. Stopping short leaks; going too far can split the port.
• Do not apply sealant to the metric tube joint, where the tube system’s own seat does the sealing.
• If a taper joint weeps after correct torque, replace the adapter rather than adding more turns or more sealant.

Installation Warnings

• Do not fit this adapter into a BSPP parallel port, an NPT port or a metric straight thread port.
• Do not interchange BSPT and BSPP parts of the same nominal size; the threads are different by design.
• Do not substitute a 60 degree seat, 74 degree cone or O-ring boss stud end for the taper stud end.
• Do not over-torque to stop a leak; taper threads can crack thin-walled ports and housings.
• Do not use the tube-end hex to tighten the taper stud end.
• Do not exceed the pressure group of the selected row, and check the port body rating in the high groups.

Applications and Industries

Cross-standard equipment integration: the most common use is a machine with taper-thread ports on the manifold or cylinder feeding a metric tube line.

Repair and replacement: taper threads and metric threads are both easy to gauge, so an unidentified adapter can usually be matched to a row from measurements alone.

High-pressure test benches: heavy series rows suit rigs that combine taper ports with metric tube runs.

Oil and gas equipment: valve packages and actuator lines on equipment built to British pipe thread practice.

Construction and mining machinery: hose and tube runs that must remain serviceable from a standard parts matrix.

Industrial plant: power units, presses and machine tools with taper-thread ports, provided the port body is rated for the group selected.

Industry tags: hydraulic adapter, BSPT adapter, taper thread fitting, R series thread, DIN 2353, ISO 8434-1, ISO 7-1, tube adapter, hydraulic fitting.

OEM Customization and Quality Traceability

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, non-standard lengths and special thread combinations are quoted from your drawing or sample, usually within 24 hours.

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

FAQ

Q: What is the difference between BSPT and BSPP?

A: BSPT is the R series taper thread defined by ISO 7-1 and seals on the threads as the taper tightens. BSPP is the G series parallel thread and needs a washer or an O-ring to seal. They are not interchangeable even at the same nominal size.

Q: Can this BSPT male hydraulic adapter 1CT-SP/1DT-SP be used without thread sealant?

A: No. A taper thread joint depends on thread interference plus an approved sealant for the system fluid. Omitting sealant usually produces a slow weep under pressure.

Q: How many turns should a taper stud end take?

A: Taper threads reach their sealing position by interference, so the usable range is limited. Tighten to the torque value for that thread size and port material, and stop there rather than adding turns to chase a leak.

Q: Which tube sizes are covered?

A: Metric tube from 6 mm to 42 mm outside diameter is covered across 37 rows, from M12X1.5 up to M52X2 on the tube end, in light series L and heavy series S.

Q: Does this adapter fit NPT ports?

A: No. NPT is a different taper thread standard with a different thread form and pitch, and it is not interchangeable with BSPT.

Q: Why is the light series pressure group lower than the heavy series?

A: Light series L rows are grouped at 25 MPa and 16 MPa while heavy series S rows reach 40 MPa because the heavy series uses larger tube-end threads and thicker tube walls. The group shown on the row governs the limit.

Q: Do you supply the sealant or the tube nut?

A: Thread sealant is not supplied as standard because it must match the system fluid and temperature. Tube nuts and ferrules can be quoted together with the adapters on request.

Q: What are your lead times?

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

Request a Quote

Send us the taper port thread size, the metric tube outside diameter, the series (light L or heavy S), the port material and the quantity. With those five details we confirm the correct row of the BSPT male hydraulic adapter 1CT-SP/1DT-SP matrix, check the pressure group and the port body rating, and return a quotation within 24 hours.

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