BSP Female Thread Brass Tee & Cross Fittings — Split or Branch Your Pipe Lines with Confidence
Whether you're routing compressed air through a workshop, plumbing a water distribution manifold, or building a hydraulic control circuit, finding a fitting that seals reliably and holds up over time is non-negotiable. Leaky or mismatched fittings waste time, create safety hazards, and force costly rework — frustrations that DIYers, plumbers, and small-shop machinists know all too well.
These BSP female thread brass pipe fittings are available in two configurations — Tee (3-port) and Cross (4-port) — each machined with a square-head profile for easy wrench engagement. Sizes span 1/8" BSP (≈9.7 mm thread OD), 1/4" BSP (≈13.2 mm thread OD), and 3/8" BSP (≈16.7 mm thread OD), covering the most common small-bore pipe sizes. Each fitting is machined from brass, offering a balance of machinability, corrosion resistance, and thread integrity. Available in quantities of 1, 2, 5, 8, or 10 pieces per order to match your project scale.
Typical applications include compressed air distribution lines in garages and workshops, residential and light commercial water supply branch-offs, pneumatic control systems requiring multi-port splitting, and hydraulic fluid circuits in small machinery — all scenarios where a reliable BSP female thread tee or cross fitting is essential.
🔗 Thread Standard: BSP (British Standard Pipe) — compatible with BSPP parallel-thread male fittings in 1/8", 1/4", and 3/8" sizes. Not directly compatible with NPT threads — use a BSP-to-NPT adapter if needed.
✅ Key Features of These BSP Female Thread Brass Tee & Cross Fittings
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🔩Square-Head Design for Secure Wrench Grip — Four flat faces allow a standard open-end or adjustable wrench to engage firmly, reducing slip during installation even in confined spaces where hex fittings can be awkward.
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🌊Tee & Cross Configurations — Choose a 3-port Tee to branch a single line into two directions, or a 4-port Cross to distribute flow to three additional lines simultaneously — both in the same BSP female thread standard.
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⚙️Brass Construction for Corrosion Resistance — Brass resists oxidation and performs reliably with water, air, and light oil media, making these fittings a dependable choice for long-term plumbing and pneumatic installations.
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📐Three BSP Sizes to Match Your Pipe — Available in 1/8", 1/4", and 3/8" BSP to cover the most common small-bore pipe sizes used in residential plumbing, workshop air lines, and light industrial systems.
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📦Flexible Quantity Options — Order 1, 2, 5, 8, or 10 pieces per SKU so you can buy exactly what your project needs — no overstocking, no running short mid-job.
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🛠️Female Thread on All Ports — All ports are female-threaded (internal thread), accepting standard BSP male fittings, nipples, or pipe ends — straightforward to integrate into existing BSP pipe systems without adapters.
📐 Technical Specifications — BSP Brass Tee & Cross Pipe Fittings
| Material |
Brass |
| Thread Standard |
BSP (British Standard Pipe) |
| Thread Type |
Female (internal thread on all ports) |
| Head Style |
Square |
| Available Sizes |
1/8" BSP, 1/4" BSP, 3/8" BSP |
| Fitting Configurations |
Tee (3-port) and Cross (4-port) |
| Available Quantities |
1, 2, 5, 8, 10 pieces per order |
| Finish |
See variant options |
| Working Pressure |
Contact us to confirm (varies by size and execution) |
| Compatible Media |
Water, air, light oil (generally); confirm for specific fluids |
| NPT Compatibility |
Not directly compatible — BSP-to-NPT adapter required |
| Country of Origin |
See variant options |
⚠️ Confirm your thread standard before ordering. BSP and NPT threads are not interchangeable. If you are unsure whether your existing fittings are BSP or NPT, measure the thread OD and compare against a BSP thread chart, or contact us before purchasing.
❓ Frequently Asked Questions
How do I choose the right BSP fitting size?
BSP sizes refer to the nominal bore of the pipe, not the outer diameter of the fitting itself. As a general guide: 1/8" BSP is typically used for small instrumentation or gauge lines; 1/4" BSP suits light-duty water or compressed air lines; 3/8" BSP handles moderate-flow applications. To confirm, measure the thread OD of your existing male fitting and compare it to a BSP thread chart — for example, a 1/4" BSP male thread generally measures approximately 13.16 mm (≈0.518") OD.
What is the difference between a Tee fitting and a Cross fitting?
A Tee fitting has three ports in a T-shape, allowing a single line to split into two directions (or two lines to merge into one). A Cross fitting has four ports in a + shape, enabling one inlet to distribute flow to three outlets — or any combination of inlets and outlets. Choose a Tee for a single branch-off and a Cross when you need to feed two separate lines from one source simultaneously.
How much pressure can these brass fittings handle?
Brass BSP fittings in these sizes are generally rated for working pressures up to approximately 200–400 PSI, depending on the specific alloy, wall thickness, and execution type. For exact pressure ratings for your application, please contact us to confirm — we're happy to provide specification details before you order.
Can I use these fittings outdoors or in wet environments?
Brass is naturally corrosion-resistant and performs well in most indoor and sheltered outdoor environments with water, air, and light oil media. It is generally not recommended for prolonged exposure to saltwater, strong acids, or highly alkaline solutions. For harsh outdoor or marine environments, stainless steel fittings are typically a better choice.
Are BSP fittings compatible with NPT threads?
No — BSP and NPT are not directly interchangeable. BSP threads have a 55° thread angle; NPT uses 60°. In some nominal sizes, the threads may appear to engage, but they will not seal reliably and can damage the threads. If you need to connect BSP to NPT, use a dedicated BSP-to-NPT adapter fitting.
Do I need thread sealant with these fittings?
Yes, in most cases. BSP parallel (BSPP) threads rely on a face seal or thread sealant for a leak-free connection — the threads alone do not seal. Apply 2–3 wraps of PTFE tape in the direction of the thread, or use a thread sealant compound, before assembly. Taper BSP (BSPT) threads can sometimes seal on the taper alone, but sealant is still generally recommended for reliability.
What advantage does the square head offer over a standard hex head?
The square head profile provides four flat faces for wrench engagement, which can be easier to grip in tight or awkward spaces where a hex fitting might slip or be difficult to access with a standard wrench. It is a traditional design widely used in plumbing, pneumatic, and hydraulic systems where reliable torque application matters.
How do I know which execution number (#1–#6) to select?
The execution numbers correspond to specific size and configuration combinations: #1–#3 are Tee Female fittings in 1/8", 1/4", and 3/8" BSP respectively; #4–#6 are Cross Female fittings in the same size progression. Select the execution that matches your fitting type (Tee or Cross) and your required BSP thread size, then choose your quantity.
🛒 Select your execution type, size, and quantity above, then add to cart — ships from our US warehouse.
