Fittings
Stainless steel
low-pressure BSP fittings
316 (CF8M) investment-cast 150lb threaded fittings to ISO 4144, from 1/8" to 4", with BSPP female and BSPT male threads.
A full range of 150lb BSP fittings
Midsteel stocks low-pressure stainless steel BSP fittings in 316 (CF8M), investment cast to ISO 4144 and rated at 150lb. Sizes run from 1/8" to 4", with 5" and 6" available on pipe nipples and sockets.
Female threads are BSPP (parallel) to ISO 228-1 and male threads are BSPT (taper) to ISO 7-1. That makes them the standard choice for threaded water, air, instrument and utility lines where corrosion resistance matters.
Specification
BSP fitting specification
Male BSPT (taper) to ISO 7-1
Other grades, pressure ratings and wall thicknesses are available on request. Material test certificates to EN 10204 3.1 are supplied as standard.
In stock
Fittings in stock
- Full sockets
- Half sockets
- Reducing sockets
- Weld nipples
- Hexagon nipples
- Pipe nipples
- Hexagon reducing nipples
- 90° female/female elbows
- 45° female/female elbows
- 90° male/female elbows
- Equal tees
- Hexagon reducing bushes
- Hose tails
- Conical unions
- Flat face PTFE unions
- Hexagon plugs
- Square plugs
- Hexagon caps
BSPP and BSPT threads
BSP threads come in two forms. BSPP (parallel) threads keep a constant diameter and seal on a washer, O-ring or gasket. BSPT (taper) threads tighten as they are screwed in and seal on the thread itself, usually with PTFE tape or a sealant. ISO 4144 fittings have parallel female threads and taper male threads, the combination used for most general threaded pipework.
BSP is not interchangeable with NPT, which has a different thread angle and pitch. If you are connecting to American-standard equipment, ask about our NPT forged fittings.
When to use 150lb BSP fittings
Cast 150lb fittings are designed for low-pressure service. For higher pressures, specify our forged 3000# and 6000# screwed fittings.
- Water, air and utility lines
- Instrument and sample lines
- Corrosion-resistant 316 throughout
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ISO 9001:2015Lloyd’s (LRQA) approved quality system
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EN 10204 3.1 certsFull material traceability as standard
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Same-day serviceAvailable on urgent stock and machined specials
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In-house machiningSpecials and hard-to-find sizes made to order
FAQs
BSP fitting questions
Can't find the answer? Our sales team can advise on grades, standards and lead times.
Need a price or a delivery date?
Send us your enquiry, schedule or drawing and our sales team will come back to you with stock, price and lead time.