How do I choose the right size BSP blanking cap?

Match the cap's BSP thread size to your pipe or fitting port. BSP sizes refer to the nominal bore, not the outer diameter. For example, a 1/2" BSP cap fits a port with a 1/2" BSP female thread. When in doubt, measure the thread OD and compare to a BSP thread chart. Common conversions: 1/4" BSP ≈ 13.16mm OD, 3/8" BSP ≈ 16.66mm OD, 1/2" BSP ≈ 20.96mm OD.

What pressure can these brass blanking caps handle?

Brass BSP blanking caps are generally rated for working pressures typically up to 150–200 PSI depending on size and application. For high-pressure hydraulic or steam systems, please contact us to confirm suitability before ordering.

Can these be used outdoors or in wet environments?

Brass offers good corrosion resistance for most indoor plumbing and general-purpose applications. For outdoor or marine environments with prolonged moisture exposure, consider applying PTFE thread tape and inspect periodically. Brass is generally not recommended for highly acidic or chlorinated water systems.

What is the difference between Hexagonal and Octagonal styles?

Both styles provide the same sealing function. Hexagonal caps have 6 flat sides and are the most common, compatible with standard hex wrenches and spanners. Octagonal caps have 8 sides and are typically used in applications where a lower-profile or decorative finish is preferred. Choose based on your tooling and space constraints.

Do I need thread sealant with these caps?

For a reliable seal, applying PTFE thread tape (plumber's tape) or a suitable thread sealant compound is generally recommended, especially for liquid or gas applications. This is standard practice for BSP parallel thread fittings.

Brass Female BSP Blanking Cap Stop End Pipe Fittings — 1/8" to 1" Hex & Octagonal

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Brass Female BSP Blanking Cap Stop End Pipe Fittings — 1/8" to 1" Hex & Octagonal

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Brass Female BSP Blanking Caps — Seal Unused Pipe Ports Cleanly and Reliably

Leaving an open pipe port in a plumbing, compressed air, or hydraulic system is an invitation for leaks, contamination, and pressure loss. Whether you're capping off a tee fitting during a phased installation, blanking a test port after commissioning, or sealing a redundant outlet on a manifold, you need a fitting that threads in cleanly and stays put. These brass female BSP blanking caps are the straightforward solution that plumbers, HVAC technicians, and serious DIYers reach for.

Each cap is machined from solid brass and features a female BSP (British Standard Pipe) internal thread. Available in Hexagonal and Octagonal head styles, with sizes ranging from 1/8" BSP to 1" BSP and cap heights from approximately 9.8mm (≈3/8") to 32mm (≈1-1/4"). The Brass variant covers a wide range of sizes for both 3/8" and larger port applications. Order in quantities of 1, 2, 3, 5, or 10 pieces to match your project needs.

Typical applications include sealing unused ports on central heating manifolds, blanking off test points on compressed air lines, capping spare outlets on water distribution blocks, and closing off redundant connections on hydraulic power units — anywhere a BSP female blanking cap for pipe sealing is required.

🔗 Thread Compatibility: These caps use BSP (British Standard Pipe) parallel thread — also known as BSPP or G thread. They are not compatible with NPT (National Pipe Taper) threads. Verify your port thread standard before ordering.

⚠️ Size Note: BSP nominal sizes refer to bore diameter, not the cap's outer dimensions. If you are unsure of your port size, measure the thread OD and cross-reference a BSP thread chart, or contact us to confirm.

✅ Key Features of These Brass BSP Blanking Caps

🔩Solid Brass Construction — Machined from brass for durability in water, air, and light hydraulic applications; resists corrosion better than steel in typical plumbing environments.
📐Full BSP Size Range — Available from 1/8" BSP to 1" BSP, covering the most common port sizes found on valves, manifolds, and pipe fittings in residential and light commercial systems.
🔷Hex & Octagonal Head Options — Choose the head style that suits your tooling and space; both accept standard wrenches for easy installation and removal without damaging surrounding components.
🛡️Female Thread Design — The internal female BSP thread engages directly onto a male BSP port or nipple, creating a flush, low-profile seal that doesn't protrude into tight spaces.
📦Flexible Pack Quantities — Order 1, 2, 3, 5, or 10 pieces per variant so you can stock exactly what you need for a single repair or a larger installation without over-buying.
🇺🇸Ships from US Warehouse — Stocked and fulfilled domestically for faster delivery to your job site or workshop, with no extended international shipping waits.

📐 Technical Specifications — Brass Female BSP Blanking Cap

Product Type	Female Blanking Cap / Stop End
Thread Standard	BSP (British Standard Pipe) — Parallel (BSPP / G Thread)
Available Thread Sizes	1/8", 1/4", 3/8", 1/2", 3/4", 1" BSP
Head Styles	Hexagonal (6-sided), Octagonal (8-sided)
Material	Brass
Cap Height Range	Approximately 9.8mm (≈3/8") to 32mm (≈1-1/4") — varies by size variant
Finish	Natural brass (unlacquered)
Pack Quantities	1 pc, 2 pcs, 3 pcs, 5 pcs, 10 pcs
Recommended Sealant	PTFE thread tape or thread sealant compound (not included)
Typical Applications	Plumbing, compressed air, hydraulics, heating systems
Pressure Rating	See variant options — contact us to confirm for high-pressure use
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right BSP blanking cap size?

Match the cap's BSP thread size to your pipe port's nominal bore size. BSP sizes refer to the nominal bore, not the physical outer diameter of the cap. Common reference points: 1/4" BSP thread OD is typically ≈13.16mm, 3/8" BSP ≈16.66mm, 1/2" BSP ≈20.96mm, 3/4" BSP ≈26.44mm, 1" BSP ≈33.25mm. When in doubt, use a thread gauge or measure the male port OD and cross-reference a BSP chart.

What pressure rating do these blanking caps have?

Brass BSP blanking caps are generally suitable for working pressures typically up to 150–200 PSI in standard plumbing and compressed air applications. Actual ratings vary by size and wall thickness. For high-pressure hydraulic, steam, or gas applications, please contact us before ordering to confirm suitability for your specific conditions.

Can I use these caps outdoors or in wet/damp environments?

Brass offers good corrosion resistance for most indoor plumbing and general-purpose outdoor use. For prolonged exposure to moisture, always apply PTFE thread tape to protect the threads and improve the seal. Brass is generally not recommended for highly acidic water, seawater immersion, or systems with aggressive chemical exposure without additional protection.

Are these BSP or NPT thread? Can I use them on NPT fittings?

These caps are BSP (British Standard Pipe) thread — specifically parallel BSP (BSPP/G thread). BSP and NPT (National Pipe Taper) threads have different thread angles and pitches and are not interchangeable. Forcing a BSP cap onto an NPT port (or vice versa) will damage the threads and will not seal reliably. Verify your system's thread standard before purchasing.

What is the difference between the Hexagonal and Octagonal styles?

Both styles provide identical sealing performance. Hexagonal (6-sided) caps are the industry standard and work with any hex wrench or open-end spanner. Octagonal (8-sided) caps offer more wrench engagement points, which can be useful in tight spaces where a full hex swing isn't possible. Choose based on your available tooling and the clearance around the port.

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

For liquid or gas applications, applying PTFE thread tape (2–3 wraps) or a compatible thread sealant compound is strongly recommended. BSP parallel threads rely on a face seal or thread sealant for a leak-free connection — the thread form alone does not self-seal like a tapered NPT thread. Thread tape is not included and should be sourced separately.

What tools do I need to install these blanking caps?

A standard open-end wrench or adjustable spanner sized to the cap's flats is all that's required. No special tools are needed. Hand-tighten first, then snug with a wrench — generally 1 to 2 additional turns after hand-tight with thread sealant applied is sufficient. Avoid over-tightening, which can crack the cap or damage the port threads.

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Brass Female BSP Blanking Cap Stop End Pipe Fittings — 1/8" to 1" Hex & Octagonal

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Brass Female BSP Blanking Caps — Seal Unused Pipe Ports Cleanly and Reliably

✅ Key Features of These Brass BSP Blanking Caps

📐 Technical Specifications — Brass Female BSP Blanking Cap

❓ Frequently Asked Questions

Brass Female BSP Blanking Cap Stop End Pipe Fittings — 1/8" to 1" Hex & Octagonal

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