G 4" Thread Specs
Standard: ISO 228 / ISO 7 (BSP)
Technical parameters and design data for the G 4" pipe thread.
Established under standard ISO 228 / ISO 7, this thread uses a pitch of 0.09091 inches and has 11 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 4"
Nominal Diameter
4.45 in(113.03 mm)
Major Diameter
4.45 in(113.03 mm)
TPI (Threads per Inch)
11
Pitch
0.09091 in
Pitch Diameter
4.3918 in(111.55 mm)
Minor Diameter
4.3336 in(110.07 mm)
Tap Drill size
109.1 mm
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Frequently Asked Questions
What is the tap drill size for G 4" pipe thread?
The recommended tap drill size for a G 4" pipe thread is 109.1 mm.
What is the major diameter of a G 4" pipe thread?
For a standard G 4" pipe thread, the major diameter at the pipe reference plane is 4.45 inches (approx. 113.03 mm).