G 3/8 Thread Specs
Standard: ISO 228 / ISO 7 (BSP)
Technical parameters and design data for the G 3/8 pipe thread.
Established under standard ISO 228 / ISO 7, this thread uses a pitch of 0.05263 inches and has 19 threads per inch.
Often used in fluid, hydraulic, or pneumatic systems, NPT/BSP threads require suitable thread sealants to assure leak-tight performance.
Dimensional Specifications
Size Designation
G 3/8
Nominal Diameter
0.656 in(16.66 mm)
Major Diameter
0.656 in(16.66 mm)
TPI (Threads per Inch)
19
Pitch
0.05263 in
Pitch Diameter
0.6223 in(15.81 mm)
Minor Diameter
0.5886 in(14.95 mm)
Tap Drill size
15.0 mm
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Frequently Asked Questions
What is the tap drill size for G 3/8 pipe thread?
The recommended tap drill size for a G 3/8 pipe thread is 15.0 mm.
What is the major diameter of a G 3/8 pipe thread?
For a standard G 3/8 pipe thread, the major diameter at the pipe reference plane is 0.656 inches (approx. 16.66 mm).