1) Type A without spanner surface, with thread.

    Type B without spanner surface, without thread.

    Type C with spanner surface, with thread.

2) The hardness of ball d1: Min. HRC52; Hardening depth: Min.1mm.

Material and surface treatments:

1) Medium carbon steel 45.Zinc plating.

2) Alternative stainless steel 304, stainless steel 303 or stainless steel 316.Surface passivation.