Grooved Pins, Half Length Grooved with Gorge
Grooved pins according to this Standard are positive or non-positive connecting elements. They are used for holding retaining rings, retaining washers, springs, etc., the grooved pin being seated firmly in the accommodating hole, for which tolerance zone H11 is recommended.

Check out other specifications
Pan Head Tapping Screws with Recessed Head
Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process
Screw thread limit gauges for parallel pipe threads
Tapping screw washer assemblies with plain washers
CARBON AND ALLOY STEEL NUTS FOR BOLTS FOR HIGH PRESSURE OR HIGH TEMPERATURE SERVICE, OR BOTH
Unhardened taper pins with external thread (ISO 8737 : 1986) English version of DIN EN 28 737