Do I need thread sealant (PTFE tape) with these fittings?

For BSPT (tapered) threads, applying PTFE tape or thread sealant compound is generally recommended to ensure a leak-free seal. For BSPP (parallel) threads, a bonded seal or O-ring is typically used at the face. Check your system's thread type before installation.

304 Stainless Steel Union BSP Male-Female Pipe Fitting Adapter — 1/4" to 2"

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304 Stainless Steel Union BSP Male-Female Pipe Fitting Adapter — 1/4" to 2"

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Size (BSP): BSP 1&4" (DN8)

Amount: 1 pcs

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$5.10 USD

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In stock (500 units), ready to be shipped

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BSP Male-Female Union Pipe Fitting Adapter — Leak-Free Connections in 304 Stainless Steel

When a leaking or corroded pipe fitting brings your plumbing, irrigation, or compressed air system to a halt, the last thing you want is a fitting that fails again in six months. Contractors, maintenance technicians, and serious DIYers who work with BSP-threaded systems need a union adapter that threads on cleanly, seals reliably, and holds up to daily use without rusting out.

Each adapter is machined from 304 stainless steel and features a male BSP thread on one end and a female BSP thread on the other, with a union-style body that allows easy disconnection for maintenance. Available in eight BSP sizes from 1/4" (DN8) to 2" (DN50) — sold individually (1 pcs per order). Thread dimensions follow the BSP standard: for example, BSP 1/2" (DN15) has a nominal thread OD of approximately 20.9mm (≈0.82"), and BSP 1" (DN25) has a nominal thread OD of approximately 33.2mm (≈1.31"). Exact dimensions vary by size — see variant options for the full range.

Typical applications include connecting dissimilar pipe runs in residential and commercial water supply lines, joining threaded sections in compressed air distribution systems, and serving as a serviceable union in irrigation manifolds where seasonal disconnection is needed — all scenarios where a BSP male-to-female stainless steel pipe fitting adapter delivers lasting value.

🔗 Thread Standard: BSP (British Standard Pipe) — compatible with BSPP and BSPT systems. Not compatible with NPT threads. Sizes available: BSP 1/4" (DN8) through BSP 2" (DN50).

✅ Key Features of These BSP Male-Female Stainless Steel Union Fittings

🔩Male-to-Female BSP Thread Design — One male BSP end and one female BSP end on a single body, making this adapter ideal for extending, redirecting, or transitioning BSP-threaded pipe runs without additional couplings.
🛠️Union-Style Serviceability — The union body design lets you disconnect the fitting without rotating either pipe section, saving time during maintenance, repairs, or seasonal system shutdowns.
⚙️304 Stainless Steel Construction — Resists rust, oxidation, and mild chemical exposure better than carbon steel or brass alternatives, making it a dependable choice for water supply, compressed air, and light fluid transfer lines.
📐Eight BSP Sizes in One Listing — Covers DN8 through DN50 (BSP 1/4" to 2"), so you can match the exact nominal pipe size your system requires without ordering from multiple suppliers.
💧Leak-Resistant Thread Engagement — Precision-machined BSP threads provide consistent engagement depth and a uniform seating surface, reducing the risk of cross-threading or incomplete seals when used with appropriate PTFE tape or thread sealant.
🏭Broad Application Range — Suited for residential plumbing, commercial HVAC, irrigation systems, and light industrial fluid circuits where a reliable BSP stainless steel pipe fitting adapter is required.

📐 Technical Specifications — BSP Male-Female Union Pipe Fitting Adapter

⚠️ Thread OD and body dimensions vary by size. Confirm your system's nominal pipe size (DN) before ordering. Contact us if you need exact dimensional drawings.

Material	304 Stainless Steel
Thread Standard	BSP (British Standard Pipe)
Connection Type	Male BSP × Female BSP (Union)
Available Sizes	BSP 1/4" (DN8), 3/8" (DN10), 1/2" (DN15), 3/4" (DN20), 1" (DN25), 1-1/4" (DN32), 1-1/2" (DN40), 2" (DN50)
Nominal Thread OD Range	Approx. 9.7mm (≈3/8") for DN8 to approx. 59.6mm (≈2-3/8") for DN50 — see variant options
Finish	Mill / brushed stainless
Typical Working Pressure	Up to 150 PSI (≈10 bar) — contact us to confirm for your application
Compatible Media	Water, air, oil, mild chemicals (verify for aggressive media)
Quantity per Order	1 piece
Thread Sealant Required	PTFE tape or thread compound recommended (not included)
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right BSP size for my pipe fitting?

BSP sizes refer to the nominal bore of the pipe, not the actual thread outer diameter. For example, a BSP 1/2" fitting has a thread OD of approximately 20.9mm (≈0.82"), and a BSP 1" fitting has a thread OD of approximately 33.2mm (≈1.31"). Match your existing pipe's nominal size (DN) to the BSP designation — e.g., DN15 = BSP 1/2", DN25 = BSP 1". When in doubt, use a thread gauge or contact us to confirm before ordering.

What is the pressure rating of these BSP union fittings?

These 304 stainless steel BSP union fittings typically handle working pressures up to 150 PSI (approximately 10 bar) in standard plumbing and fluid transfer applications. Actual ratings depend on temperature, media, and installation conditions. For high-pressure systems, please contact us to confirm suitability before ordering.

Can these fittings be used outdoors or in corrosive environments?

Yes. 304 stainless steel offers good resistance to atmospheric corrosion, moisture, and many mild chemicals, making it suitable for outdoor plumbing, irrigation manifolds, and light industrial use. For highly chlorinated water or marine/coastal environments, 316 stainless steel is generally recommended instead.

Are these fittings compatible with NPT (National Pipe Thread) systems?

No — BSP and NPT threads are not interchangeable. BSP uses a 55° thread angle while NPT uses 60°. Attempting to mix them can result in leaks or cross-threading damage. If your system uses NPT threads, please select the appropriate NPT fitting. Contact us if you are unsure which standard your system uses.

Do I need PTFE tape or thread sealant with these fittings?

For BSPT (tapered) threads, applying PTFE tape or a thread sealant compound is generally recommended to achieve a leak-free seal. For BSPP (parallel) threads, a bonded seal washer or O-ring at the face is typically used. Check your system's thread type before installation. PTFE tape is not included with this fitting.

What fluids are these fittings compatible with?

These 304 stainless steel union fittings are generally compatible with water, compressed air, oil, and many non-aggressive chemicals. They are commonly used in water supply lines, compressed air distribution, and light hydraulic circuits. Compatibility with aggressive acids, high-chloride solutions, or solvents should be verified before use.

What is the difference between a union fitting and a standard pipe coupling?

A union fitting allows you to disconnect and reconnect two pipe sections without rotating either pipe — ideal for maintenance, repairs, or seasonal system shutdowns. A standard coupling requires at least one pipe end to be rotated during installation. Union fittings are the preferred choice whenever future serviceability matters.

🛒 Select your size (BSP) above, then add to cart — ships from our US warehouse.

304 Stainless Steel Union BSP Male-Female Pipe Fitting Adapter — 1/4" to 2"

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BSP Male-Female Union Pipe Fitting Adapter — Leak-Free Connections in 304 Stainless Steel

✅ Key Features of These BSP Male-Female Stainless Steel Union Fittings

📐 Technical Specifications — BSP Male-Female Union Pipe Fitting Adapter

❓ Frequently Asked Questions

304 Stainless Steel Union BSP Male-Female Pipe Fitting Adapter — 1/4" to 2"

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