Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"
Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"
Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"
Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"
Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"
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Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"

Hex Head Pipe Plug Male O-Ring Face Seal NPT/PT Stainless Steel 304 — 1/8" to 2"

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Price:
$4.98 USD
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In stock (500 units), ready to be shipped

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Description

 

Hex Head Pipe Plugs with O-Ring Face Seal — Solid 304 Stainless Steel for NPT & PT Ports

When an unused port leaks — even a slow seep — it can compromise an entire hydraulic circuit, pneumatic system, or plumbing installation. Maintenance technicians, machine builders, and DIY plumbers who work with threaded pipe systems need a plug that seals reliably the first time and holds up over years of service without corroding, loosening, or requiring constant re-torquing.

Each plug is machined from solid 304 stainless steel (A2 grade) and features a hex head drive for easy wrench installation. The O-ring face seal (ORFS) design creates a positive, leak-free seal at the port face rather than depending on thread engagement alone. Available in both NPT (National Pipe Taper) and PT (BSP Taper) thread standards, with sizes ranging from 1/8" to 2" (approximately 10mm to 60mm thread OD). Sold individually or in 2-piece sets depending on the size selected.

Typical applications include capping unused hydraulic manifold ports, sealing off pneumatic valve block openings, plugging test ports on industrial machinery, and closing off pipe ends in stainless steel plumbing systems — all situations where a stainless steel NPT pipe plug or BSP pipe plug with a reliable O-ring seal is the right solution.

🔩 Thread Compatibility: Available in NPT (US standard, 60° angle) and PT/BSPT (metric/international, 55° angle). NPT and PT threads are not interchangeable — confirm your port standard before ordering. Select your thread type and size using the variant options above.

✅ Key Features of These Hex Head Stainless Steel Pipe Plugs

  • 🔒 O-Ring Face Seal (ORFS) Design — The integrated O-ring seals at the port face for a positive, leak-free connection without relying on thread tape or pipe dope in most applications.
  • ⚙️ Hex Head Drive — The six-sided head accepts a standard open-end or adjustable wrench, allowing controlled torque application and easy removal during maintenance — no special tools required.
  • 🛡️ Solid 304 Stainless Steel (A2) — Machined from solid bar stock, not cast or hollow. 304 SS resists rust, oxidation, and mild chemical exposure, making it suitable for both indoor and outdoor pipe plug applications.
  • 📐 Wide Size Range — 1/8" to 2" — Covers the most common pipe thread sizes used in US and international plumbing, hydraulic, and pneumatic systems, from small instrument ports up to large 2" main line plugs.
  • 🔄 Dual Thread Standard — NPT & PT — Both NPT (National Pipe Taper) and PT (BSP Taper) variants are stocked, so you can match the correct thread standard to your equipment without adapters or modifications.
  • 🏭 Male Threaded, External Hex Body — The male thread engages directly into a female-threaded port or fitting, while the external hex body sits flush or slightly proud for a clean, professional installation in manifolds, valve blocks, and pipe assemblies.

📐 Technical Specifications — Hex Head Male Pipe Plug

Product Type Hex Head Male Pipe Plug with O-Ring Face Seal
Material Solid 304 Stainless Steel (A2 Grade)
Thread Standards NPT (National Pipe Taper) and PT (BSP Taper / BSPT)
Available Sizes 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2" (both NPT and PT)
Thread OD Range Approx. 10.3mm (1/8") to 60.3mm (2") — varies by nominal size
Drive Style External Hex Head (wrench-driven)
Seal Type O-Ring Face Seal (ORFS)
Finish Mill / Natural Stainless (no coating)
Working Pressure See variant options — contact us to confirm for your size
Temperature Range Generally suitable for -20°C to +200°C (-4°F to +392°F); confirm for your application
Pack Quantity 1 pc or 2 pcs (select via Amount option)
Country of Origin Contact us to confirm
⚠️ Confirm before ordering: NPT and PT (BSP) threads are not interchangeable. Measure your port or check your equipment manual to identify the correct thread standard and nominal size. When in doubt, contact us — we're happy to help you select the right plug.

❓ Frequently Asked Questions

How do I choose the right pipe plug size?

Match the plug size to your port's thread size — not the outer diameter of the fitting body. For example, a 1/2" NPT port requires a 1/2" NPT plug. If you're unsure, measure the thread OD: a 1/2" NPT thread is typically about 0.840" (21.3mm) in outer diameter. Always verify the thread standard (NPT vs PT/BSP) before ordering.

What is the difference between NPT and PT (BSP) threads?

NPT (National Pipe Taper) is the US standard with a 60° thread angle. PT (Pipe Taper, also called BSPT) is the metric/international standard with a 55° thread angle. They are not interchangeable — always confirm which standard your equipment uses before selecting a plug.

How strong is a 304 stainless steel pipe plug?

304 stainless steel (A2) generally has a tensile strength of around 515 MPa (75,000 psi) and a yield strength of approximately 205 MPa (30,000 psi). These plugs are typically rated for working pressures up to several thousand PSI depending on size — contact us to confirm pressure ratings for your specific application.

Can these pipe plugs be used outdoors or in wet environments?

Yes. 304 stainless steel offers good corrosion resistance in most outdoor and wet environments. It performs well against water, mild chemicals, and atmospheric exposure. For highly chlorinated or marine/saltwater environments, 316 stainless steel is generally recommended instead.

Does the O-ring provide a leak-free seal without thread sealant?

The O-ring face seal (ORFS) design creates a positive, leak-free seal at the face of the port rather than relying solely on thread engagement. In most cases, no additional thread tape or sealant is needed — however, for critical pressure applications, consult your system specifications.

What tool do I need to install a hex head pipe plug?

A standard open-end wrench or adjustable wrench sized to the hex head is all you need. The hex head design allows for firm torque application without slipping. Do not over-tighten — follow the torque specifications for your thread size and system pressure.

Are these plugs suitable for hydraulic or pneumatic systems?

These hex head pipe plugs with O-ring face seal are commonly used in hydraulic and pneumatic systems to cap off unused ports. The O-ring seal helps prevent fluid or air leakage. Always verify the pressure rating is compatible with your system before installation.

What sizes are available and what do the size designations mean?

Available sizes range from 1/8" to 2" in both NPT and PT thread standards. The size designation refers to the nominal pipe thread size, not the actual measured diameter. For reference: 1/8" NPT has a thread OD of approximately 0.405" (10.3mm); 2" NPT has a thread OD of approximately 2.375" (60.3mm).

🛒 Select your thread size and quantity above, then add to cart — ships from our US warehouse.

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