1-1/2" BSP parallel (G1-1/2 / BSPP) (G1-1/2)
Where G1-1/2 is used, its real dimensions, and how to connect it to other standards.
G1-1/2Thread standard
DesignationG1-1/2
Major diameter47.803 mm
Threads per inch / pitch11
Thread formparallel, 55 degree
Seals onflat washer or bonded seal on the face
Used on: large transfer pumps, tank flanges and IBC plumbing.
G1-1/2 at 11 TPI is a large-bore transfer thread. On IBC and tank work it is usually reached through an S60x6 buttress-to-BSP adapter rather than cut directly.
Quick-connect click fittings from Hozelock, Gardena and Karcher are proprietary and do not interchange. They all sit on top of a standard thread underneath, so the reliable way to move between brands is to adapt at the threaded tap or hose-end fitting, then use each brand's own connector above it.
Connect this thread
Connect 2" camlock (cam-and-groove) coupling to 1-1/2" BSP parallel (G1-1/2 / BSPP)needs an adapter1/8" BSP parallel (G1/8 / BSPP)related standard (G1/8)1/4" BSP parallel (G1/4 / BSPP)related standard (G1/4)3/8" BSP parallel (G3/8 / BSPP)related standard (G3/8)1/2" BSP parallel (G1/2 / BSPP)related standard (G1/2)3/4" BSP parallel (G3/4 / BSPP)related standard (G3/4)1" BSP parallel (G1 / BSPP)related standard (G1)1-1/4" BSP parallel (G1-1/4 / BSPP)related standard (G1-1/4)1/4" BSP tapered (R1/4 / BSPT)related standard (R1/4)3/8" BSP tapered (R3/8 / BSPT)related standard (R3/8)
Sources: ISO 228-1 (G / BSPP parallel pipe threads) · BSP thread dimensions chart (ISO 228 / ISO 7), AmesWeb