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G thread

G thread is with a 55°apex angle used on originally inch-based pipes. The BSPP thread has the same parallel straight as the G thread.

BSPP thread Vs G thread

BSPP, represents the British Standard Pipe Parallel thread. These threads maintain a consistent diameter, making them ideal for certain applications within plumbing and pipe fitting.

BSPP thread is often referred to as “G” threads, the two types of thread are the same parallel straight, the threads are measured in threads per inch.

BSP/BSPT Thread Fitting
BSP/BSPT Thread Fitting

BSPT thread

Conversely, British Standard Pipe Taper threads (BSPT), marked with the letter R, have a diameter that increases or decreases along the length of the thread. This unique feature makes them suitable for different applications compared to their parallel counterparts.

BSPT male / BSPT female
BSPT male / BSPT female
90° Elbow BSPT Female 7T9
90° Elbow BSPT Female 7T9
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