INDUSTRY COMPONENT

Set Screw

A set screw is a type of fastener used to secure an object within or against another object, typically without a protruding head.

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Component Specifications

Definition
A set screw is a threaded fastener designed to be inserted into a threaded hole in one component to bear against another component, preventing relative motion between them. In motor hub applications, it secures components like gears, pulleys, or couplings to the shaft by applying compressive force through its tip, which may be flat, cone, cup, or dog point shaped. It functions without a nut and often sits flush or below the surface.
Working Principle
The set screw works by applying axial clamping force through its threaded engagement in a tapped hole. When tightened, its tip presses against the shaft (or another surface), creating friction and mechanical interference that prevents rotational or axial movement. In motor hubs, this secures mounted components to the shaft, ensuring torque transmission and alignment.
Materials
Typically made from alloy steel (e.g., ASTM A574, grade 8.8 or 12.9), stainless steel (e.g., AISI 304 or 316), or brass. Common coatings include zinc plating, black oxide, or dichromate for corrosion resistance.
Technical Parameters
  • Length 5mm to 50mm
  • Hardness HRC 28-45 depending on grade
  • Tip Type Cup point (common for high grip)
  • Head Type Socket head (hex key drive)
  • Thread Size M3 to M12 common
  • Torque Specification Varies by size and material (e.g., M6: 10-15 Nm)
Standards
ISO 4026, ISO 4027, ISO 4028, DIN 913, DIN 914

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Set Screw.

set screw grub screw motor hub fastener socket set screw cup point screw shaft locking screw industrial fasteners Set Screw in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Motor Hub

The central rotating component of a cooling fan that connects the motor shaft to the fan blades.

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Engineering Analysis

Risks & Mitigation
  • Over-tightening causing thread stripping
  • Insufficient torque leading to slippage
  • Corrosion in harsh environments
  • Tip wear reducing grip over time
FMEA Triads
Trigger: Incorrect torque application
Failure: Screw loosens, causing component misalignment or detachment
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications; apply thread-locking adhesive if needed
Trigger: Material fatigue or corrosion
Failure: Screw breaks or seizes, requiring replacement and downtime
Mitigation: Select corrosion-resistant materials (e.g., stainless steel), apply protective coatings, and implement regular maintenance checks
Trigger: Improper tip or size selection
Failure: Inadequate grip leads to slippage and reduced machine efficiency
Mitigation: Choose tip type (e.g., cup point for shafts) based on application; verify dimensions against engineering drawings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thread tolerance per ISO 965-1 (e.g., 6g for external threads), length tolerance ±0.5mm
Test Method
Torque testing per ISO 16047, hardness testing per ISO 6508, salt spray testing per ISO 9227 for corrosion resistance

Buyer Feedback

★★★★☆ 4.6 / 5.0 (24 reviews)

"The Set Screw we sourced perfectly fits our Machinery and Equipment Manufacturing production line requirements."

"Found 48+ suppliers for Set Screw on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Set Screw is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the difference between a set screw and a regular screw?

A set screw typically has no protruding head and is designed to secure an object within another, often using a tip that digs into the surface, whereas regular screws have heads for driving and are used to join components together.

How do I choose the right set screw for a motor hub?

Consider shaft material, required torque, environmental conditions (e.g., corrosion), and tip type (e.g., cup point for high vibration). Match thread size to the tapped hole and ensure proper hardness and length for secure fastening.

Can set screws be reused?

Limited reuse is possible if undamaged, but repeated tightening can wear the tip or threads, reducing clamping force. Inspect for deformation and replace if in doubt, especially in critical applications like motor hubs.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Servo Motor Rotor Set Screws