SFMS is a Hexagon Socket Flange Head Screw Plug with O-Ring.
O-rings are included, so grooving of the female thread side member is not required.
Parallel threads prevent distortion of the female thread side member, as is the case when tightening tapered screws. Suitable for hydraulic and pneumatic equipment that is frequently installed and removed.
The stainless steel SFMS is standardised with metric threads and parallel pipe threads.