BSP Male Stainless Steel Countersunk End Plug — Internal Hex, 1/4" to 2"

Match the plug size to your pipe's nominal BSP thread size — not the pipe's physical outer diameter. For example, a 1/2" BSP plug fits a port with a 1/2" nominal BSP female thread. When in doubt, measure the thread OD and compare to a BSP thread chart. This product is available in 1/4" through 2" BSP. If you're unsure, contact us with your thread OD measurement and we'll help confirm the right size.

Three drive styles are offered: Hexagon Socket (internal hex/Allen key drive — ideal for recessed or tight-clearance ports), External Hexagon (standard open-end or box wrench drive — good for accessible ports where you need high torque), and Hexagonal Nut (spanner-friendly nut-style head — versatile for general plumbing use). Choose based on the tools you have available and the access space around the port.

Yes. Stainless steel generally provides strong resistance to rust, oxidation, and many corrosive media, making these plugs typically suitable for outdoor plumbing, marine-adjacent installations, and light chemical environments. For aggressive chemical exposure or high-chloride environments, confirm stainless steel grade compatibility with your specific application before installation.

No — BSP (British Standard Pipe) and NPT (National Pipe Thread) are different thread standards with different thread angles and pitches. They are not interchangeable. BSP uses a 55° thread angle; NPT uses a 60° thread angle. Attempting to mix them can result in cross-threading, leaks, or fitting damage. Confirm your ports use BSP threads before ordering.

Pressure ratings depend on the specific size, installation torque, and system conditions. Stainless steel BSP end plugs generally handle moderate to high working pressures in standard plumbing and hydraulic systems. For critical pressure applications — such as high-pressure hydraulics or pressure testing — contact us to confirm suitability for your specific size and operating conditions.

For a leak-free seal, applying PTFE tape or a compatible thread sealant compound to the male BSP threads before installation is generally recommended. This is standard practice for most pipe plug applications. Wrap PTFE tape in the direction of the thread (clockwise when viewed from the thread end) for best results.

A countersunk end plug has a low-profile or flush-sitting head that sits close to the mating surface when installed, making it ideal for manifolds, machinery ports, and assemblies where a protruding head would interfere with surrounding components or create a snag hazard. Standard hex plugs typically have a taller, more prominent head. The countersunk style is commonly preferred in hydraulic manifolds and compact mechanical assemblies.

Yes. Each size is available in packs of 1, 3, 5, 10, or 20 pieces. Larger pack sizes offer a lower per-unit cost, making them practical for maintenance stock, production line use, or multi-port manifold projects where you need several plugs of the same size. Select your preferred quantity using the Qty(pcs) option above.