Editorial Technical Reference

Locking Device

This page explains how Locking Device 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

A mechanical component within an end bearing assembly that secures bearing elements in position to prevent axial movement or rotation.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Locking Device

Definition
A locking device is a critical component of an end bearing assembly designed to maintain precise positioning of bearing elements. It prevents unwanted axial displacement or rotational slippage of bearing components under operational loads, ensuring proper alignment and load distribution within the assembly. This device typically interfaces with bearing races, shafts, or housings to provide secure mechanical fixation. The locking device is available in various configurations, such as set screw, eccentric collar, or tapered adapter, to suit different mounting requirements. It is manufactured from carbon steel, alloy steel, or stainless steel, offering options for corrosion resistance and strength. The device is designed to accommodate bore diameters from 10 to 100 mm, outer diameters from 20 to 150 mm, and widths from 10 to 50 mm, with standard sizes per ISO 286 and custom sizes on request. Dynamic load ratings range from 5 to 50 kN, and static load ratings from 10 to 100 kN, based on bearing size and per ISO 76. Maximum speed depends on lubrication and load, ranging from 500 to 5000 rpm. Operating temperature range is -20 to 80°C for standard seals, with high-temperature options available. The material is typically bearing steel GCr15 per GB/T 18254, with stainless steel options. Precision grades P0 to P6 per GB/T 307.1 are available, with P6 for higher precision. Weight varies with size, from 0.1 to 5 kg. When selecting a locking device, verify the specific model's dimensions, load ratings, speed limits, and material compatibility with the application. Confirm that the chosen device meets the required standards and fits the bearing assembly. Regular inspection for wear, loosening, or corrosion is recommended to ensure reliable operation. If the device fails to hold the bearing in position, it may lead to misalignment, increased vibration, or premature bearing failure. Always consult the manufacturer's documentation for installation torque, maintenance intervals, and replacement criteria.
Working Principle
The locking device operates by creating mechanical interference or friction between bearing components. Common mechanisms include threaded locking collars that apply axial pressure, set screws that engage with shafts or grooves, or clamping mechanisms that compress bearing elements. When properly tightened, the device generates sufficient holding force to counteract operational forces that might cause movement. The specific mechanism depends on the locking type: a set screw directly presses against the shaft, an eccentric collar uses an offset cam to lock, and a tapered adapter uses a taper to create a tight fit. The holding force must be matched to the expected axial and rotational loads to prevent slippage. Over-tightening can damage components, while under-tightening may allow movement. Proper installation and torque specification are critical for effective locking.
Common Materials
Carbon Steel, Alloy Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Bore Diameter10–100 mmStandard sizes; custom on requestISO 286
Outer Diameter20–150 mmHousing fit toleranceISO 286
Width10–50 mmAxial space constraintISO 286
Dynamic Load Rating5–50 kNBased on bearing sizeISO 76
Static Load Rating10–100 kNMax static load without deformationISO 76
Max Speed500–5000 rpmDepends on lubrication and load
Operating Temperature-20–80 °CFor standard seals; high-temp option available
MaterialGCr15Bearing steel; stainless option availableGB/T 18254
Precision GradeP0–P6P0 standard; P6 for higher precisionGB/T 307.1
Locking TypeSet screwAlso available: eccentric collar, tapered adapter
Weight0.1–5 kgVaries with size

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
  • Locking Collar Body Part
    Main structural component that surrounds the shaft and provides mounting surface for locking elements
    Material: steel
  • Set Screws Part
    Threaded fasteners that apply pressure against the shaft to create friction lock
    Material: alloy steel
  • Locking Nuts Part
    Threaded fasteners that secure the locking collar in position through axial compression
    Material: steel
  • Eccentric Collar Optional
    Locks by turning an offset cam onto the shaft instead of pressing a screw into it.
  • Tapered Adapter Optional
    A tapered sleeve that wedges the bearing bore onto a straight shaft.

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100 bar
other spec: Max axial load: 50 kN, Max rotational speed: 3000 rpm
temperature: -40°C to 150°C
Media Compatibility
✓ Lubricating oils ✓ Grease-packed environments ✓ Clean hydraulic fluids
Unsuitable: High-concentration abrasive slurries
Sizing Data Required
  • Shaft diameter
  • Required axial load capacity
  • Bearing housing dimensions

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Wear and deformation
Cause: Repeated mechanical stress, improper installation torque, or material fatigue leading to loss of locking force and dimensional changes.
Corrosion and contamination
Cause: Exposure to harsh environments (moisture, chemicals), inadequate protective coatings, or ingress of debris causing seizure or reduced effectiveness.
Maintenance Indicators
  • Visible deformation, cracks, or discoloration on the locking device surface
  • Audible rattling or movement in the secured assembly indicating loss of clamping force
Engineering Tips
  • Apply proper installation torque using calibrated tools and follow manufacturer specifications to prevent over-tightening or under-tightening
  • Implement regular inspection and cleaning schedules, and use appropriate anti-corrosion coatings or materials suited for the operating environment

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
ANSI/BHMA A156.5 - Auxiliary Locks and Associated Products DIN 18251 - Locking Devices for Doors and Windows

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.05mm
  • Surface Flatness: 0.1mm
Quality Inspection
  • Dye Penetrant Test for Surface Defects
  • Hardness Test (Rockwell C Scale)

Manufacturers of Locking Device

3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

BRIGHT-TOOLS
Shanghai, CN
Also makes: Collet Chuck, Tool Holder
Listed on the company's own website · profile compiled by CNFX from public sources
Changzhou Tianniu Transmission Equipment Co., Ltd
Changzhou, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Recca Machinery
Sichuan, CN
Also makes: Torque Limiter
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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
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Frequently Asked Questions

What is the function of a locking device in an end bearing assembly?

The locking device secures bearing elements in position, preventing axial movement or rotation under operational loads. It ensures proper alignment and load distribution within the assembly.

What materials are available for locking devices?

Locking devices are available in carbon steel, alloy steel, and stainless steel. The material choice affects corrosion resistance and strength, and should be selected based on the application environment.

What are the standard size ranges for locking devices?

Bore diameters range from 10 to 100 mm, outer diameters from 20 to 150 mm, and widths from 10 to 50 mm, per ISO 286. Custom sizes are available on request.

How do I verify the correct locking device for my application?

Check the required bore diameter, outer diameter, width, load ratings, speed, and temperature range. Confirm that the device meets the relevant standards (e.g., ISO 286, ISO 76) and consult the manufacturer for model-specific specifications.

Data Basis

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

Preliminary Technical Classification
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