Standard Threads for Cable Glands

We will give you a brief description about several common threads of cable glands here.

cable gland, also known as cable connector, cable joint, is widely used in mechanical equipment, electrical equipment, marine electrical, and some anti-corrosion equipment, to fix and protect the cables.

There are usually four threads for the cable glands, they are Metric (M) thread, American NPT thread, German PG thread and British G thread.

1. NPT is the abbreviation of National (American) Pipe Thread, belongs to the American standard 60 degree tapered pipe thread, mostly used in North America. The national standard can be found in GB/T12716-1991.

2. PT is the abbreviation of Pipe Thread, is a 55 degree sealed conical pipe thread, belongs to Wyeth thread family, mostly used in Europe and Commonwealth countries. Commonly used in water and gas pipe industry, the taper is 1:16. national standards can be found in GB/T7306-2000.

3. G is 55 degrees non-thread sealing pipe thread, belongs to Wyeth thread family. Marked as G indicates cylindrical threads. The national standard can be found in GB/T7307-2001.

In addition, the thread in the 1/4, 1/2, 1/8 mark is the diameter of the thread size, the unit is inch. People in the industry usually use points to call the thread size, an inch is equal to 8 points, 1/4 inch is 2 points, so analogous. G is the collective name of the pipe thread (Guan), 55, 60 degrees of the division belongs to the functional, commonly known as the pipe circle. That is, the thread is processed from a cylindrical surface.

4. And about the M metric threads, there are a little differences between Chinese metric threads and European metric threads. In China, the pitch for the metric threads above M25 pitch is 2, and the pitch for European metric threads is always 1.5.