STAINLESS STEEL SOCKET PIPE PLUGS WITH COLLAR DIN 908

Socket Pipe Plugs with Collar DIN 908 — DIN 908 takes the same internal-hex socket plug as DIN 906 and adds a collar, or shoulder, that bears squarely against the face around the port opening rather than relying purely on the thread engagement to locate and seal the plug. That collar gives a defined seating face for a bonded washer, so sealing happens at a flat, controlled surface instead of depending entirely on thread form or applied sealant - a meaningful advantage on parallel-thread ports, which don't self-seal the way a tapered thread can. It's the standard choice across hydraulic and pneumatic systems, and other fluid-handling equipment using parallel-threaded ports, wherever a repeatable, reliable seal matters more than the slightly larger footprint the collar adds compared with a plain socket plug. Like DIN 906, it's driven with an Allen key through an internal hex socket, so the external profile stays reasonably compact even with the added collar - worth checking clearance around the port if space is tight, since the collar does sit slightly proud of a plain plug's body. Whether a sealing washer is included with the plug or needs to be ordered separately varies by supplier, so it's worth confirming at the time of ordering rather than assuming one is bundled in. Choosing the right plug means matching thread type and size precisely to the port, and specifying a washer material compatible with the fluid and temperature involved in the system. Grade selection follows the same reasoning as other pipe fittings: A2 suits general indoor pneumatic and low-corrosion fluid systems, while A4 is worth the extra cost in washdown environments, food and beverage plant, marine or coastal installations, or chemical process work, where chloride exposure would otherwise degrade an A2 plug's seal and finish over time.

FAQs
Is a sealing washer supplied with the plug?
Not necessarily - check at the time of ordering whether a bonded seal or separate washer is included or needs to be ordered alongside the plug.

What washer material should be specified for the collar seal?
This depends on the fluid and temperature in the system - general water and air systems are often fine with a standard bonded washer, while chemical or high-temperature applications need a washer material checked for compatibility before ordering.

Does the collar significantly increase the plug's overall size?
Only slightly - it adds a shoulder around the socket body, which is worth checking against available clearance in tight installations but rarely rules out this plug where DIN 906 would otherwise fit.