Locknut: Width Across Flats 17-115 mm, Height 8-25 mm

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

Parameter	Typical range	Notes & selection driver
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

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 10511, ISO 7042, DIN 985, DIN 6927

Parent Products

This component is used in the following industrial products

Aluminum Cable Gland

An aluminum cable gland is a mechanical device used to attach and secure the end of an electrical cable to equipment, providing strain relief and environmental sealing.

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

Typical Suppliers & Equivalents

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

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

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Manufacturers of Locknut

Manufacturer profiles associated with Locknut.

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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.

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.

Locknut