INDUSTRY COMPONENT

Set Screw / Clamp Bolt

A precision fastener used to secure tool holders in machining centers by applying radial clamping force.

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Component Specifications

Definition
A set screw or clamp bolt is a specialized threaded fastener designed for securing tool holders in CNC machining centers, milling machines, and lathes. It functions by applying controlled radial clamping force through mechanical tightening, creating friction between the tool holder and machine spindle to prevent rotation and axial movement during high-speed operations. These components are engineered for precise torque transmission and vibration damping in industrial machining applications.
Working Principle
Works through mechanical interference and friction locking. When tightened, the screw's tip (often with specific geometry like flat, cone, or cup point) presses against the tool holder, creating radial clamping force. This force generates sufficient friction between the tool holder and machine spindle to resist rotational torque and axial forces during machining operations, while allowing for quick tool changes when loosened.
Materials
Typically made from alloy steels (AISI 4140, 4340) or tool steels (HSS) with hardness 45-55 HRC. High-performance versions use carbide-tipped contact points. Surface treatments include black oxide, zinc plating, or titanium nitride coating for corrosion resistance and reduced friction.
Technical Parameters
  • Length 20-100 mm
  • Head Type Hex socket, Torx, or spline drive
  • Point Type Cup point, flat point, cone point, or dog point
  • Thread Size M6 to M24
  • Torque Range 10-200 Nm
  • Clamping Force 5-50 kN
Standards
ISO 4762, DIN 912, ISO 4026

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Set Screw / Clamp Bolt.

set screw clamp bolt tool holder fastener CNC clamping machining center bolt industrial fastener tool holding system Set Screw / Clamp Bolt Set Screw / Clamp Bolt in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Tool Holders

Mechanical fixtures that securely mount cutting tools onto a rotating cutting drum.

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Engineering Analysis

Risks & Mitigation
  • Over-torquing causing thread stripping
  • Under-torquing leading to tool slippage
  • Fatigue failure from cyclic loading
  • Corrosion in coolant environments
  • Compatibility issues with non-standard tool holders
FMEA Triads
Trigger: Improper torque application
Failure: Tool holder slippage during machining
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications
Trigger: Material fatigue from cyclic loading
Failure: Fracture during operation
Mitigation: Implement regular inspection schedule and replace at recommended intervals
Trigger: Corrosion from machining coolants
Failure: Seizing in threaded holes
Mitigation: Use corrosion-resistant coatings and proper sealing

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thread tolerance: 6g per ISO 965-1, Length tolerance: ±0.5 mm, Hardness tolerance: ±2 HRC
Test Method
Torque-to-failure testing per ISO 16047, Salt spray testing per ISO 9227, Fatigue testing with cyclic loading at 80% of rated torque

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a set screw and a clamp bolt?

Set screws typically have full threading and are designed to bear against a surface, while clamp bolts often have partial threading and work with nuts or threaded holes in clamping assemblies. In tool holder applications, the terms are often used interchangeably for components that apply radial clamping force.

How often should tool holder clamp bolts be replaced?

Inspect every 6-12 months or after 10,000 clamping cycles. Replace if there is visible wear, thread damage, or if torque values drop below 80% of specification. Regular maintenance prevents tool slippage and maintains machining accuracy.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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