Grub Screws, also known as Set Screws or Blind Screws, are headless threaded fasteners used to secure one component against or within another component, usually without requiring a nut. A common application is securing a pulley, gear, or similar component to a shaft.
Unlike conventional screws and bolts, Grub Screws generally do not have a protruding head. They are typically threaded along their length and can be fully driven into a tapped hole, allowing the fastener to sit flush with or below the surface of the component. This headless design makes them useful where a low-profile fastening solution is required.
Key Features
- Headless design allows flush or recessed installation.
- Fully threaded construction provides secure engagement in tapped holes.
- Designed for fastening without a separate nut.
- Suitable for securing gears, pulleys, shafts, and mechanical components.
- Available with different point designs for specific applications.
- Compact design is useful where space or surface clearance is limited.
- Knurled point options can provide additional resistance to loosening.
- Available in multiple materials, sizes, and protective coatings.
How Grub Screws Work
A Grub Screw is installed into an existing tapped hole or threaded socket and tightened against the component being secured. The screw’s point makes contact with the mating surface, shaft, or component and creates the required holding force.
Because there is no protruding head, the screw can be positioned within the assembly without significantly increasing the external profile.
Grub Screw Point Types
The shape of the point influences how the Grub Screw contacts and grips the mating component.
Cup Point
Cup Point Grub Screws have a concave, rounded contact area that provides a secure grip while distributing contact over the curved point. They are widely used for general shaft and component fastening.
Cone Point
Cone Point Grub Screws feature a pointed tip designed to provide concentrated contact with the mating surface. They can be suitable where a deeper point engagement is required.
Knurled Cup Point
Knurled Cup Point Grub Screws incorporate a textured contact surface that can provide additional resistance against rotation and loosening. They can be considered for applications where vibration or repeated movement is a concern.
Applications
Grub Screws are commonly used in:
- Securing gears to shafts
- Pulley and shaft assemblies
- Machinery and mechanical equipment
- Drive and transmission components
- Couplings and rotating assemblies
- Industrial equipment
- Engineering and fabrication
- Applications requiring low-profile fastening
Standards
Grub Screws can be manufactured and supplied according to recognized standards, including:
- ASME
- BS
- DIN
- ISO
- UNI
- DIN-IN
- Other applicable international standards
Customized specifications can also be considered according to customer requirements.
Available Sizes and Threads
Grub Screws are available in a range of sizes and thread configurations, including:
- Metric sizes: M3 to M36
- Imperial sizes: No. 10 to 1.1/2″
- Thread specifications according to customer requirements
- Standard and customized dimensions
Thread type, pitch, length, and point configuration can be selected according to the application.
Materials
Adore Industries can supply Grub Screws in different materials, including:
- Stainless Steel
- Carbon Steel
- Duplex Stainless Steel
- Super Duplex Stainless Steel
- Brass
- Aluminum
- Other materials according to customer requirements
Material selection can be based on strength, corrosion resistance, environmental exposure, and application conditions.
Coatings and Finishes
Grub Screws can be supplied with suitable coatings and surface treatments, including:
- PTFE Coated
- Hot-Dip Galvanized
- Aluminum-Zinc Flake Coated
- Zinc Plated
- Nickel Plated
- Other finishes according to customer requirements
Why Choose Adore Industries?
Adore Industries supplies Grub Screws with options for:
- Headless and flush-fitting designs
- Multiple point configurations
- Metric and imperial sizes
- Customer-specified thread configurations
- Various material options
- Protective coatings and finishes
- Standard and customized specifications
- Application-specific manufacturing
Choose Adore Industries for reliable Grub Screws designed for secure, low-profile fastening in mechanical and industrial applications.