Slotted capstan screws
Slotted capstan screws may be used both as fastening and adjusting screws. They are primarily designed for use in electrical engineering and may be tightened by means of a sliding tee bar where it is not possible to use a screwdriver. Locking wires are often attached to the cross holes for securing purposes.

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SETSCREW-HEXAGON SOCKET, CUP POINT, CORROSION-RESISTING STEEL, PASSIVATED, UNC-3A, PLAIN AND SELF-LOCKING
Hexagon thin nuts (chamfered) Product grades A and B (ISO 4035 : 1986) English version of DIN EN 24 035
Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished
Prevailing torque type hexagon regular nuts (with non-metallic insert) — Property classes 5, 8 and 10
M42 to M160 x 6 hexagon head bolts – Product grade B
Cross Recessed Countersunk (Oval) Head Screws (Countersunk Heads according to ISO)