Hex Socket Set Screws Grub Screws M3-M20 DIN 916 Cup Point Black Oxide Zinc Plated for Shaft Positioning

Hex socket set screws (also called grub screws) are headless fasteners driven by an Allen key, designed to lock a component against another by point contact instead of clamping with a head. Our range covers the full M3 to M20 metric span with plain, black oxide and zinc plated finishes, engineered for shaft positioning, bearing fixing and precision locating in moulds and dies.

• M3-M20 full size range - one supplier for prototype work up to production runs, lengths 3-100mm, coarse and fine pitch available.
• Plain / Black Oxide / Zinc Plated - natural finish for oiled assemblies, black oxide for tool-room and mould work, clear or blue-white zinc for corrosion protection in humid workshops.
• Built for positioning and fixing - cup point grips shafts, cone point locates precisely, flat and dog points suit bearing seats, collars, pulleys, gears and mould inserts.

• Shaft positioning - locking collars, couplings and hubs onto motor and gearbox shafts.
• Bearing fixing - retaining bearing inner rings, pillow block housings and linear rail carriages.
• Mould and die work - precision locating of inserts, ejector plates and slide cores where no screw head is allowed.
• General machinery - pulleys, sprockets, knobs, handles and machine guards.

 hardness and torque testing per lot, salt spray testing for plated parts, thread gauge inspection and optical dimension check before packing.

Plastic bag + export carton + plywood pallet, or branded bags per customer artwork. Stock sizes ship in 7-15 days, production orders in 20-30 days depending on quantity and finish.

Tell us size, length, point type, grade and finish, and we will quote the exact price per piece. OEM marking, custom lengths and special point designs are welcome.