STAINLESS STEEL SOCKET PIPE PLUGS DIN 906

Socket Pipe Plugs DIN 906 — DIN 906 is a plain threaded plug for blanking off an unused port in a manifold, valve body, gearbox housing, or pipework fitting, driven with an Allen key via an internal hexagon socket rather than a spanner on an external head. That internal drive keeps the whole fitting compact and low-profile, which matters where an external hex head would foul on surrounding pipework, brackets, or a tight enclosure, or simply where clearance around the port is limited. It's a common fitting across pneumatic systems, water and general fluid pipework, instrumentation ports, and any application using BSP (British Standard Pipe) or metric threaded connections that occasionally need capping off. Sealing typically comes from the thread form itself on tapered thread types, supplemented with a sealant or PTFE tape as standard practice; where the port uses a parallel thread that doesn't self-seal on its own, the collared version of this plug, DIN 908, gives a more positive seal via a bonded washer instead. Choosing the right plug is mostly about matching thread type and size exactly to the port being blanked - a parallel thread plug in a tapered port, or the reverse, either won't seat properly or won't seal reliably even with sealant applied - so confirming thread form against the fitting's specification before ordering avoids a mismatched fit. Grade selection depends on the environment more than the application itself: A2 stainless is generally adequate for indoor pneumatic systems and general low-corrosion fluid work, while A4 is worth specifying for washdown areas, marine or coastal installations, food and beverage plant, or chemical process pipework, where chloride exposure or aggressive cleaning agents would shorten an A2 plug's working life. DIN 906 fixes the thread form, hex socket size, and overall body dimensions for this plug pattern, keeping it interchangeable with equivalent fittings from other manufacturers.

FAQs
How does it seal?
Sealing is typically achieved through the thread form itself (on tapered thread types) or via a sealant or PTFE tape on the thread.

How does it differ from DIN 910?
DIN 910 uses an external hexagon head for a spanner rather than an internal socket, otherwise serving the same blanking function.

Is the same plug used for both tapered and parallel BSP threads?
No - thread form (tapered vs parallel) needs to match the port exactly; the plug itself doesn't compensate for the wrong thread type, so checking the fitting's specification before ordering matters more than plug size alone.