Female Adapter - BSP Thread

John Guest female adapter with BSP/BSPT thread

Family of adapters for connecting tubing via push‑fit system to a threaded connection of the size indicated in each variant. The range includes metric and imperial combinations.

How to read the variants

Each option shows two pieces of data: the thread and the tube size. Both must match. The available variants include combinations with 5/16", 3/8" and 1/2" tube and different BSP/BSPT threads depending on the selected option.

Compatibility, contents and fitting

A 15 mm tube option is available. For JG0016, 8 mm and 5/16″ refer to the same option. Check the outside diameter of the tube and the type and nominal size of the mating male thread.

The selected adapter is supplied. Depending on the variant, the joint seals with a gasket or at the thread. JG0015 includes a sealing washer. JG0016 is supplied without a thread seal. Check for leaks after fitting.

Compatibility

Do not choose a thread solely by its approximate diameter. BSP, BSPT and other standards may share similar nominal sizes and still not be interchangeable.

Installation

With the circuit depressurized, prepare the tube with a clean, perpendicular cut, insert fully, and fit the appropriate thread. Avoid side loads on the body of the fitting.

Best practices

In installations with many transitions, identify the size of each line and label the equipment thread. This reduces errors in future replacements.

Frequently asked questions

Do all variants use the same thread?
No. You must check the exact option selected.

Is it suitable for both metric and imperial tube?
The range includes different combinations; check the specific variant.

Can I force a thread that looks almost the same?
No. Both the standard and the size must match.

What should I check before buying?
Outside tube diameter, thread type and nominal connection size.

• John Guest fitting guide
• John Guest tube cutter