Editorial Technical Reference

Chuck / Gripper Jaws

This page explains how Chuck / Gripper Jaws is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Mechanical gripping component that securely holds caps during the rotary capping process.

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Chuck / Gripper Jaws in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Chuck / Gripper Jaws

Definition
The chuck/gripper jaws are precision-engineered components of a rotary capping head assembly. Their primary function is to firmly grasp and retain bottle caps or closures during the high-speed rotation and application phase of the capping process, ensuring proper alignment, consistent torque application, and secure sealing without damaging the cap or container. These jaws are typically mounted within a chuck assembly and are actuated mechanically, pneumatically, or via servo control. During operation, they move radially inward to grip the cap's exterior or engage with specific features (like lugs or ribs). Once engaged, they maintain a calibrated clamping force while the entire head rotates to screw or press the cap onto the container. After application, they retract to release the capped container. The jaws are available in tool steel, hardened alloy steel, or stainless steel, offering durability and resistance to wear. Key parameters include jaw width (20–80 mm) determining cap size range, jaw opening range (10–50 mm) adjustable for cap diameters, gripping force (50–200 N) ensuring secure cap handling, operating pressure (1.0–1.6 MPa), repeatability (±0.05 mm) critical for consistent capping, operating temperature (-10–60 °C) outside which seal integrity may be affected, ingress protection (IP54–IP65) per IEC 60529, material 6061-T6 aluminum alloy per ASTM B211 for strength and weight, and weight (0.5–2.0 kg) affecting inertia and cycle time. These values are directory reference ranges and must be confirmed for the actual model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
The jaws are mounted within a chuck assembly and actuated mechanically, pneumatically, or via servo control. During operation, they move radially inward to grip the cap's exterior or engage with specific features like lugs or ribs. Once engaged, they maintain a calibrated clamping force while the entire head rotates to screw or press the cap onto the container. After application, they retract to release the capped container.
Common Materials
Tool Steel, Hardened Alloy Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Jaw Width20–80 mmDetermines cap size range
Jaw Opening Range10–50 mmAdjustable for cap diameters
Gripping Force50–200 NEnsures secure cap handling
Operating Pressure1.0–1.6 MPa
Repeatability±0.05 mmCritical for consistent capping
Operating Temperature-10–60 °COutside range may affect seal integrity
Ingress ProtectionIP54–IP65Dust and water resistanceIEC 60529
Material6061-T6Aluminum alloy for strength and weightASTM B211
Weight0.5–2.0 kgAffects inertia and cycle time

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

Components / BOM
  • Jaw Insert Part
    The replaceable contact surface that directly grips the cap, often designed with specific profiles (serrated, smooth, contoured) to match cap features and prevent slippage.
    Material: Hardened Tool Steel or Carbide
  • Jaw Body Part
    The main structural component that houses the insert and connects to the chuck's actuation mechanism, providing rigidity and alignment.
    Material: Alloy Steel
  • Retention Pin/Screw Part
    Fastens the jaw insert to the jaw body, allowing for easy replacement when worn.
    Material: Steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Max 10 bar gripping force
other spec: Max rotational speed: 3000 RPM, Jaw material hardness: 45-55 HRC
temperature: -20°C to 120°C
Media Compatibility
✓ Plastic bottle caps ✓ Metal screw caps ✓ Glass container lids
Unsuitable: Highly corrosive chemical environments without protective coating
Sizing Data Required
  • Cap diameter range (mm)
  • Required gripping force (N)
  • Production line speed (caps/min)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear and surface degradation
Cause: Abrasive particles from workpiece materials, repeated clamping cycles causing friction-induced material loss, and lack of proper lubrication leading to accelerated surface deterioration.
Fatigue cracking and fracture
Cause: Cyclic loading stresses exceeding material endurance limits, stress concentration at jaw serrations or clamping features, and improper jaw alignment creating uneven load distribution.
Maintenance Indicators
  • Visible scoring, galling, or excessive wear marks on jaw contact surfaces
  • Audible clicking, grinding, or abnormal vibration during clamping operations
Engineering Tips
  • Implement regular jaw alignment verification and adjustment procedures to ensure even load distribution and prevent premature wear
  • Establish a preventive maintenance schedule for jaw cleaning, inspection of serrations, and application of appropriate anti-seize compounds on mounting surfaces

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 12164-1:2001 (Tool holders with cylindrical shank - Part 1: Shanks and location bores) DIN 6388 (Chuck Jaws for Lathe Chucks)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.02mm
  • Parallelism of gripping surfaces: 0.05mm per 100mm length
Quality Inspection
  • Dimensional verification using CMM (Coordinate Measuring Machine)
  • Hardness testing (Rockwell C scale) to verify heat treatment
Technical documentation
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Manufacturing capability
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Inspection readiness
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Manufacturers of Chuck / Gripper Jaws

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Frequently Asked Questions

What materials are available for chuck/gripper jaws?

According to the directory, the jaws can be made from tool steel, hardened alloy steel, or stainless steel. The specific material grade should be confirmed with the manufacturer for your application.

What is the gripping force range?

The directory lists a gripping force range of 50–200 N. This ensures secure cap handling, but the exact force required depends on the cap type and capping torque. Verify with the supplier.

What is the operating temperature range?

The operating temperature range is -10 to 60 °C. Outside this range, seal integrity may be affected. Always check the manufacturer's specifications for your specific environment.

What ingress protection rating do these jaws have?

The ingress protection rating is IP54–IP65 per IEC 60529, indicating dust and water resistance. Confirm the exact rating for your model with the manufacturer.

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

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Rotary Capping Head
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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