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Threaded connection flexible metal hose is one of the most commonly used small-diameter flexible connectors, with pipe diameters from 1/4 inch to 4 inches. The thread standards often used for threaded metal hoses are BSP, NPT, G, M, JIC, etc.

NPT thread:
The full name of NPT is National (American) pipe thread, which is the standard of 60-degree tapered pipe thread in the United States, mainly used in North America.

G thread:
G is a Chinese national standard thread, a pipe thread with a thread angle of 55 degrees and a non-threaded seal. It belongs to the Wyeth thread family, marked with G, which stands for cylindrical thread.
The internal and external threads are cylindrical pipe threads, which do not have sealing properties after mating, and only play a connecting role in the pipeline. With the help of the sealing ring, they can be used for low-pressure pipelines under static load. The top and bottom of the tooth are all circular arcs, and the large, medium and small diameters and the pitch per inch are marked in inches.

BSP thread:
BSP is a British parallel pipe thread standard, BSPP is a pipe thread, BSPT is a 55-degree angle taper pipe screw, and BSP thread refers to the cylindrical pipe thread of the British general sealing pipe thread (R), which is a kind of Whitworth thread, which is 55 The degree of thread type generally adopts the cylindrical internal thread and the conical external thread to cooperate to achieve the sealing effect.

M thread:
M stands for metric common triangular thread with a profile angle of 60 degrees. M refers to the pipe thread that is sealed with thread, which has tightness after tightening, the crest and bottom are arc-shaped, the taper of the taper thread is 1:16, and the size of each part is in millimeters.

JIC thread:
The JIC thread is also the American fine thread UNF, and the threaded end has a 74-degree taper for sealing.


Dinghong is a professional manufacturer of stainless steel flexible metal hose and hose fittings. Originally engaged in the research, development, design, manufacture and sales of high-tech components for industrial pipeline soft connection systems. If you are not sure which connection thread standard to use, please contact us for more information.