Cone Point Grub Screw

Description

Cone Point Grub Screw, also known as a cone point set screw, is a specialized fastener designed for high holding power in mechanical assemblies. These screws are typically headless and are used to secure one object within or against another, often without protruding from the surface. The defining feature of a cone point grub screw is its sharp, conical tip, which is engineered to penetrate the surface of the mating material, providing a secure and semi-permanent hold.

They are used for permanent location of parts. Deep penetration on tightening gives highest axial and holding power.

The pointed tip can either located into a machined depression or it can make and indentation into a softer material. It offers better holding power and increased point pressure.

In material over Rockwell C15 point is spotted to half its length to develop shear strength across point. It is also used for pivots and fine adjustment.

Design and Structure of Cone Point Grub Screw

Cone point grub screws are part of the broader family of set screws or grub screws, which are threaded fasteners designed to exert compressive force through their tip. Unlike standard screws, grub screws are headless, allowing them to be driven below or flush with the surface. The cone point design tapers to a sharp, precise point, forming an angle (typically around 90° to 120°) that concentrates force at a single contact point.

This focused pressure enables the cone point to dig into the surface of the mating component—often a shaft, collar, or rotating part—creating a highly resistant mechanical grip. The internal drive type is usually a hex socket (Allen), though slotted and other variations also exist.

Primary Applications of Cone Point Grub Screw

Cone point grub screws are widely used across various industries, including mechanical engineering, automotive, aerospace, and manufacturing. They are ideal for situations where maximum grip and semi-permanent fastening are required. Common applications include:

• Securing collars, gears, and pulleys to rotating shafts

• Locking rotating components in place under torque or vibration

• Positioning and retention of components in mechanical assemblies

• Fixing knobs or levers on control shafts

• Preventing axial movement in tight-tolerance assemblies

The pointed tip of the cone point screw allows it to bite into the shaft or surface, preventing slippage and maintaining alignment even under heavy loads or constant motion.

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