Set Screw

Set screws, also known as grub screws, are threaded fasteners designed to secure one component inside or against another without the use of a nut. Unlike standard bolts or screws, they are fully threaded from top to bottom and exert holding power through their tip, which presses directly against a shaft or surface. Common applications include fixing pulleys, gears, collars, and knobs onto shafts in machinery, automotive assemblies, and industrial equipment.

Available Types by Drive Style

Drive Style	Description
Socket Set Screw (Hex Socket)	Features a hexagonal internal drive for high torque application using an Allen key. Most common for industrial applications
Slotted Set Screw	Features a straight slot drive for use with standard flathead screwdrivers. Suitable for light to medium torque applications
Square Head Set Screw	External square head design for wrench tightening. Provides high torque capability and easy identification

Available Point Styles

Point Style	Description
Cone Point	Conical tip that generates the highest torsional holding power. Penetrates into flat surfaces; ideal for permanent setting on hard materials
Cup Point	Cup-shaped concave tip that bites into the contact surface, creating a strong hold with good vibration resistance. Most common general-purpose point
Flat Point	Flat, blunt tip that distributes compression evenly. Suitable for thin-walled or soft materials where surface damage must be minimized
Dog Point (Full Dog)	Extended cylindrical tip that fits into a pre-drilled hole or groove on the shaft. Provides precise axial positioning
Half-Dog Point	Shorter cylindrical tip than full dog; designed to locate into matching holes for permanent setting
Oval Point	Rounded tip that minimizes surface damage. Ideal for applications requiring frequent adjustments
Knurled Cup Point	Cup point with serrated ridges that dig into the surface for enhanced vibration resistance. Not reusable after tightening
Nylon Point	Soft nylon tip that grips curved or textured surfaces without marking. Suitable for delicate or finished surfaces

Applicable Standards

Standard	Description
ISO 4027	Hexagon socket set screws with cone point – metric series
ISO 4028	Hexagon socket set screws with dog point – metric series
ISO 4029	Hexagon socket set screws with cup point – metric series
ISO 4026:2024	Hexagon socket set screws with flat point – metric series (latest version)
ASME B18.3	Socket cap, shoulder, and set screws – inch series
DIN 916	Hexagon socket set screws with cup point – metric series (equivalent to ISO 4029)
ISO 2342	Slotted set screws with cup point
ISO 7434:2024	Slotted set screws with cone point – metric series (newest 2024 version)

Materials

Alloy Steel – Heat-treated for high strength; available with black oxide or zinc plating
Stainless Steel – Grades 304 (A2) and 316 (A4) for corrosion resistance
Brass – Non-magnetic, corrosion resistant; suitable for decorative or electrical applications
Nylon – Lightweight, non-marring, electrically insulating

Surface Finishes