INDUSTRY COMPONENT

Lock Nut / Retainer

A specialized nut designed to prevent loosening under vibration in piston and rod assemblies.

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Component Specifications

Definition
A lock nut, also known as a retainer nut, is a critical fastening component in piston and rod assemblies that maintains precise axial positioning of the piston rod while preventing unintended rotation or loosening due to operational vibrations, dynamic loads, and thermal cycling. It typically features a self-locking mechanism or is used with locking elements to ensure joint integrity.
Working Principle
The lock nut works by creating a prevailing torque or mechanical interference that resists rotational forces. Common mechanisms include nylon inserts (nyloc nuts) that create friction, deformed threads that increase thread engagement resistance, or secondary locking features like crimping, adhesive patches, or tab washers that physically prevent rotation once tightened to the specified torque.
Materials
Typically made from medium-carbon steel (e.g., Grade 5, 8.8), alloy steel (e.g., Grade 8, 10.9), or stainless steel (AISI 304, 316). May include non-metallic elements like nylon for insert types. Coatings include zinc plating, galvanization, or phosphate treatment for corrosion resistance.
Technical Parameters
  • Height Standard or thin profile variants
  • Thread Size M8 to M30 (metric) or 5/16" to 1-1/4" (imperial)
  • Locking Type Nylon insert, all-metal prevailing torque, or flange with serrations
  • Torque Specification 20-300 Nm (depending on size and grade)
Standards
ISO 7042, ISO 10511, DIN 985, DIN 6923

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Lock Nut / Retainer.

lock nut retainer nut piston rod fastener vibration-resistant nut nyloc nut prevailing torque nut DIN 985 ISO 7042 Lock Nut / Retainer Lock Nut / Retainer in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Piston and Rod Assembly

A critical assembly within a hydraulic luffing cylinder that converts hydraulic pressure into linear mechanical motion.

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Engineering Analysis

Risks & Mitigation
  • Over-torquing can strip threads or damage the locking mechanism
  • Incorrect nut selection may lead to assembly failure under dynamic loads
  • Corrosion in harsh environments can compromise locking performance
FMEA Triads
Trigger: Insufficient torque during installation
Failure: Nut loosens, causing piston rod misalignment or detachment
Mitigation: Use torque wrenches and follow manufacturer specifications; implement regular torque checks in maintenance schedules
Trigger: Material fatigue from cyclic loading
Failure: Fracture of the nut or threads, leading to catastrophic assembly failure
Mitigation: Select high-grade materials (e.g., alloy steel); conduct periodic non-destructive testing (NDT)

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thread tolerance per ISO 965-1 (6g for external, 6H for internal); dimensional tolerances per ISO 4759-1
Test Method
Vibration testing per ISO 16148, torque-tension testing per ISO 16047, salt spray testing per ISO 9227 for corrosion resistance

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 lock nut and a standard nut?

A lock nut incorporates a self-locking feature (e.g., nylon insert, deformed threads) to prevent loosening under vibration, while a standard nut relies solely on torque and may require a separate lock washer.

How do you properly install a lock nut on a piston rod?

Clean the threads, apply the specified torque using a calibrated wrench, and ensure the locking mechanism (e.g., nylon insert) is fully engaged. Avoid over-torquing to prevent damage.

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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