J.W. Winco Inc. offers GN 6319.1 steel and stainless steel spherical washers, seat and dished combined type in metric sizes. These RoHS-compliant spherical washers provide an "undetachable" combination of male and female spherical washers similar to DIN 6319. This simplifies storage and allows for fast and efficient installation.

The stainless steel versions are used for clamping in corrosion-free environments. Steel washers are case hardened all round, depth .2 to .4mm, hardness (550 + 100) HV 10. Stainless steel washers are European standard 1.4305 (American standard 303 series). Both types are offered to fit bolt thread sizes M6 to M20.