Type MS - With brass pivot.
Type KU - With plastic pivot (Polyacetal POM).
Type ZK - With spherical pivot.
GN933.5 Hexagon head screws, Stainless Steel, with Pivot
These hexagon head screws, GN 933.5, with brass or plastic pivots, are useful when pressure dents or damage to the clamping surface must be avoided.
The ZK version feature a spherical pivot whose diameter d4 is smaller than the core diameter d1 of the thread. This makes them suitable for holding thrust pads GN631 / GN631.5 which must be ordered separately.
Hexagon head screw - Stainless Steel (A2), AISI 304