BSPP Thread data sheet

Basic Thread Dimensions

* The below values are nomoinal (without tolerances) and are valid for both external and internal threads.

Property mm Inch
Nominal Pipe Size (Ø) 1/16" ...
Pitch (TPI) (P) 28 ...
Pitch (Distance) (P) 0.907 0.0357
Thread V half Angle (α) 27.5° 27.5°
Height of sharp V (H) 0.871 0.0343
Thread height (h) 0.581 0.0229
Root/Crest Radius (r) 0.125 0.0049
Major Diameter (D) 7.723 0.3041
Pitch Diameter (D2) 7.142 0.2812
Minor Diameter (D1) 6.561 0.2583
Tap Drill Size (Td) 6.8 0.2677
Thread Family BSPP (G)
Relevant Standards ISO 228-1, ISO 228-2

Tolerances for all Classes


BSPP G 1/16 (Internal Thread)

Property Minimum Maximum
Minor Diameter (D1) 6.561 mm (0.2583 ") 6.843 mm (0.2694 ")
Pitch Diameter (D2) 7.142 mm (0.2812 ") 7.249 mm (0.2854 ")

BSPP G 1/16-A (External Higher precision)

Property Minimum Maximum
Major Diameter (d) 7.509 mm (0.2956 ") 7.723 mm (0.3041 ")
Pitch Diameter (d2) 7.035 mm (0.277 ") 7.142 mm (0.2812 ")

BSPP G 1/16-A (External Low precision

Property Minimum Maximum
Major Diameter (d) 7.509 mm (0.2956 ") 7.723 mm (0.3041 ")
Pitch Diameter (d2) 6.928 mm (0.2728 ") 7.142 mm (0.2812 ")

* For More Threadibg Information go to the BSP Thread Calculator

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