Type B - Steel, standard spring load.
Type BN - Stainless Steel, standard spring load.
Type BS - Steel, high spring load.
Type BSN - Stainless Steel, high spring load.
GN615.4 Spring Plunger, with Bolt, Steel, with Internal Hexagon.
These spring plungers are used as detents as well as for push-on and push-off applications and ejectors.
Steel - blackened
Bolt - hardened
Housing - Stainless Steel AISI 303
Bolt - zinc plated Stainless Steel NI AISI 420C, hardened