INDUSTRY COMPONENT

Set Screw / Clamp Bolt

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

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
ParameterTypical rangeNotes & selection driver
Length20-100 mm
Head TypeHex socket, Torx, or spline drive
Point TypeCup point, flat point, cone point, or dog point
Thread SizeM6 to M24
Torque Range10-200 Nm
Clamping Force5-50 kN

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 4762, DIN 912, ISO 4026

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Set Screw / Clamp Bolt

Manufacturer profiles associated with Set Screw / Clamp Bolt.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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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