Cup Point Grub Screw

Description

Cup Point Grub Screw

The cup point is the most used style set screw. It is used for fast, permanent and semi-permanent location of parts on shafts with hardness differential of 10-15 Rockwell C points and where cutting in of cup edge on the shaft is acceptable. It is used for soft materials where high tightening torques are impractical.

Available as PLAIN CUP for soft materials, zinc, die castings where high tightening torques are impractical.
Knurled cup for resisting more severe vibration.

Knurled Cup or KCP are used for quick and permanent location of gears, collars, pulleys or knobs on shafts.

Key Characteristics of cup point grub screw

Cup point grub screws are characterized by the following features:

• Concave Tip: The cup-shaped point digs into the surface of the mating part, providing high holding power.

• Headless Design: Allows for a flush finish, reducing snagging risks and providing a neat appearance.

• Full Thread Length: Enables secure engagement within the tapped hole, maximizing grip strength.

Applications

Cup point grub screws are commonly used in applications where reliable and semi-permanent fastening is required. Some key use cases include:

1. Securing Rotating Components to Shafts
   This is perhaps the most common use. Cup point grub screws secure collars, pulleys, gears, and knobs to rotating shafts. The concave tip grips the shaft surface securely, minimizing slippage.

2. Mechanical and Industrial Equipment
   Used extensively in motors, gearboxes, and power transmission systems to maintain alignment and prevent axial or rotational movement.

3. Automotive and Aerospace Components
   Cup point grub screws are used where tight tolerances and strong fastening are essential, including in high-vibration environments.

4. Consumer Products
   Found in items such as furniture, bicycles, and tools where parts need to be securely held together without visible fasteners.

5. Electronics and Precision Devices
   Used to fix components like potentiometers, rotary encoders, and tuning dials in place without damaging the components.

Advantages of Cup Point Grub Screws

Cup point grub screws offer several practical advantages:

• Strong Holding Power
  The concave tip bites into the surface of the mating material, providing greater resistance to movement, especially in dynamic or vibrating environments.

• Reusable and Adjustable
  While they do bite into surfaces, cup point grub screws can often be loosened and retightened with minimal degradation of holding performance, especially in hard materials.

• Compact Design
  The headless form factor allows the screw to be completely embedded within a component, ideal for applications with limited space.

• Widely Available
  Cup point screws are the most commonly used type of grub screw, available in a vast range of sizes, materials, and drive types.

 

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