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Locknut Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

A locknut is a threaded fastener component used in aluminum cable glands to secure the gland body to an enclosure or panel. It features a self-locking mechanism, typically through nylon inserts, deformed threads, or prevailing torque design, that resists rotational loosening caused by vibration, thermal cycling, or dynamic loads. In cable gland applications, it ensures a secure, vibration-resistant seal for electrical cables entering enclosures.

Working Principle

The locknut works by creating frictional resistance or mechanical interference between its threads and the mating threads. Common mechanisms include: 1) Nylon insert locknuts where a nylon ring deforms against the bolt threads, 2) All-metal prevailing torque nuts with elliptical or distorted threads that create interference fit, 3) Two-piece designs with a free-spinning washer that jams against the base nut. This prevents counter-rotation and maintains clamping force.

Materials

Typically made from aluminum alloy (e.g., 6061-T6, 5052) to match aluminum cable gland bodies, providing corrosion resistance and electrical conductivity. May include stainless steel (A2/A4) or brass variants. Nylon inserts are often PA66 (polyamide 66).

Technical Parameters

Height 8-25 mm
Thread Size M12 to M75 metric threads
Locking Torque 2-150 Nm depending on size
Temperature Range -40°C to +120°C (with nylon insert)
Width Across Flats 17-115 mm
Corrosion Resistance IP68 when installed

Standards

ISO 10511, ISO 7042, DIN 985, DIN 6927

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Locknut.

Parent Products

This component is used in the following industrial products

Aluminum Cable Gland

Aluminum fitting for securing and sealing electrical cables entering enclosures

View Product Details

Industrial Wire Harness Conduit Fitting

A mechanical component that securely connects and seals conduit to electrical enclosures or junction boxes.

View Product Details

Engineering Analysis

Risks & Mitigation

Galvanic corrosion when mating with dissimilar metals
Over-torquing can strip aluminum threads
Nylon inserts degrade at high temperatures
Incorrect installation reduces locking effectiveness

FMEA Triads

Trigger: Vibration from machinery or transportation
Failure: Nut loosens, breaking cable gland seal
Mitigation: Use prevailing torque locknuts with proper installation torque

Trigger: Material fatigue from thermal cycling
Failure: Cracking of aluminum nut body
Mitigation: Select alloys with proper thermal expansion characteristics and temperature ratings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

ISO 4759-1 for thread tolerances, ±0.1mm on dimensions

Test Method

Vibration testing per ISO 16151, torque retention testing per DIN 25201

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

How does a locknut differ from a standard nut in cable glands?

Locknuts incorporate locking features (nylon inserts, deformed threads) that prevent loosening from vibration, while standard nuts require separate locking washers or thread-locking compounds.

Can aluminum locknuts be used with stainless steel glands?

Not recommended due to galvanic corrosion risk. Use matching materials or insulating washers.

What maintenance do locknuts require?

Periodic torque checks in high-vibration environments. Nylon insert locknuts are generally single-use after disassembly.

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.

Locknut