Replacement O-Rings for 1/4 inch hex and 5/16 inch hex 10-32 threaded fittings.

The small and medium sized O-Rings are used on most Beswick Engineering 10-32 male threaded fittings.

The OR-14 O-Ring is used for fittings that have a 1/4″ hex.

The OR-516-40 is used for fittings that have a 5/16″ hex.