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Connect 1/2" BSP tapered (R1/2 / BSPT) to Garden Hose Thread (GHT / NH)

How to join R1/2 and 3/4"-11.5NH, and what stops it leaking.

Needs adapter

End A

1/2" BSP tapered (R1/2 / BSPT) (R1/2)

Seals on on the thread flanks with PTFE tape or paste

via adapter

End B

Garden Hose Thread (GHT / NH) (3/4"-11.5NH)

Seals on flat washer or O-ring in the female coupling

Adapter neededR1/2 BSP tapered to GHT hose adapter

Not a direct fit. Joining 1/2" BSP tapered (R1/2 / BSPT) to Garden Hose Thread (GHT / NH) needs a R1/2 BSP tapered to GHT hose adapter.

The adapter to buy

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A garden pump with an R1/2 tapered outlet reaches a hose through an R1/2-to-GHT adapter. Tape the tapered BSP end; the GHT end seals on the coupling washer. Check the pump outlet is R1/2 and not R3/4 before buying.

Do not over-tighten the tapered end trying to stop a weep. A taper seals with a few firm turns; forcing it splits the female casting.

Related connections

1/2" BSP tapered (R1/2 / BSPT)R1/2 Garden Hose Thread (GHT / NH)3/4"-11.5NH Garden Hose Thread (GHT / NH) to 3/4" BSP parallel (G3/4 / BSPP)adapter Garden Hose Thread (GHT / NH) to 1/2" BSP parallel (G1/2 / BSPP)adapter Male aerator thread (M22 x 1 / 15/16"-27) to Garden Hose Thread (GHT / NH)adapter M22 x 1.5 pressure-washer, 15 mm bore to Garden Hose Thread (GHT / NH)adapter

Sources: BS 21 / ISO 7 (BSPT tapered pipe threads) · BSP thread dimensions chart (ISO 228 / ISO 7), AmesWeb · ASME B1.20.7 (garden hose / GHT / NH threads) · NPSH / NH / NHR hose coupling thread table, Fittings.space