Clamping Screws: Length Range 20-150 mm

Component Specifications

Definition

Clamping screws are threaded fasteners designed specifically for jaw assemblies in industrial machinery, providing adjustable and secure clamping force to hold workpieces or components in place during machining, assembly, or testing operations. These screws feature specialized thread profiles and head designs optimized for repeated clamping cycles and precise force application.

Working Principle

Clamping screws operate on the mechanical advantage principle of threaded fasteners, converting rotational torque into linear clamping force. When tightened, the screw thread engages with the jaw assembly's mating threads, creating axial force that compresses the jaw components against the workpiece. The screw's pitch and thread geometry determine the mechanical advantage and force amplification.

Materials

Typically manufactured from alloy steel (AISI 4140, 4340) or stainless steel (AISI 304, 316) with hardness ranging from 28-42 HRC. High-performance variants may use titanium alloys or precipitation-hardened stainless steels for specialized applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Head Style	Hex socket, slotted, or knurled
Thread Type	Metric (M6-M20), UNC/UNF, or ACME threads
Length Range	20-150 mm
Torque Rating	10-200 Nm depending on size
Surface Finish	Black oxide, zinc plating, or passivation
Tensile Strength	800-1200 MPa

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 898-1, DIN 933

Parent Products

This component is used in the following industrial products

Jaw Assembly

A mechanical assembly within a chucking system that directly contacts and secures workpieces during machining operations.

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Engineering Analysis

Risks & Mitigation

Thread stripping from over-torquing
Corrosion in harsh environments
Fatigue failure from cyclic loading
Improper alignment causing uneven clamping force

FMEA Triads

Trigger: Excessive torque application during installation
Failure: Thread stripping or screw head deformation
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications; implement torque monitoring systems

Trigger: Corrosive operating environment
Failure: Thread seizure or reduced clamping force
Mitigation: Select appropriate corrosion-resistant materials; apply protective coatings; implement regular maintenance schedules

Trigger: Cyclic loading during machine operation
Failure: Fatigue cracking leading to sudden failure
Mitigation: Use fatigue-resistant materials; implement regular inspection protocols; consider redundant clamping systems for critical applications

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Thread tolerance: 6g for external threads, 6H for internal threads per ISO 965-1; Length tolerance: ±0.5 mm

Test Method

Torque-to-failure testing per ISO 16047; Salt spray testing per ASTM B117; Hardness testing per ISO 6508-1

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 Clamping Screws

Manufacturer profiles associated with Clamping Screws.

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Frequently Asked Questions

What is the difference between clamping screws and regular machine screws?

Clamping screws are specifically designed for repeated clamping applications with optimized thread profiles for better force distribution, often featuring finer threads and specialized head designs for torque application in confined spaces.

How often should clamping screws be inspected and replaced?

Regular inspection every 6-12 months is recommended, with replacement when thread wear exceeds 10% of original profile, corrosion is visible, or torque values deviate by more than 15% from specifications.

Can clamping screws be used with different jaw assembly materials?

Yes, but material compatibility must be considered. Steel screws work with most metals, while stainless steel or titanium screws are recommended for aluminum or composite jaw assemblies to prevent galvanic corrosion.

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.

Clamping Screws