Sealing rings for threaded studs according to

I SO 6149-2 / -3 Form E (metric)
ISO 11926-2 / -3 Form F (UN/UNF)

The standard material of the O-rings is NBR

designation
GP-OR-16,36x2,21-NBR90
Sku
0900279990
    More Information
    O-ring d x s 16.36 x 2.21
    Thread d2 3/4-16 UNF-2A