INDUSTRY COMPONENT

Compression Nut

A threaded fastener used in aluminum cable glands to create compression seals around cables for environmental protection.

Component Specifications

Definition
A compression nut is a critical component in aluminum cable gland assemblies designed to secure and seal cables entering electrical enclosures. This cylindrical nut features internal threads that engage with the gland body and a tapered compression surface that forces a sealing ring or washer against the cable jacket when tightened. It creates a watertight, dustproof, and strain-relief seal by applying uniform radial pressure around the cable circumference while maintaining electrical continuity through proper grounding.
Working Principle
The compression nut operates on the mechanical compression principle. When threaded onto the cable gland body and tightened, its internal conical surface forces a compression ring (typically neoprene or similar elastomer) to deform radially inward against the cable sheath. This creates three simultaneous functions: 1) Environmental sealing through radial compression of the sealing element, 2) Cable retention through frictional grip, and 3) Grounding continuity through metal-to-metal contact between the nut, gland body, and enclosure. The tapered design ensures progressive sealing force distribution.
Materials
Aluminum alloy (typically 6061-T6 or 5052-H32) with anodized surface treatment (minimum 15μm thickness) for corrosion resistance. Alternative materials include brass (CW614N), stainless steel (AISI 304/316), or nickel-plated steel for specific applications.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Hex Size17mm-75mm across flats
IP RatingIP68/IP69K when properly installed
Thread TypeMetric (M12-M75) or PG/NPT threads
Surface FinishAnodized per MIL-A-8625 Type II/III
Compression RangeCable diameters 3mm-60mm
Temperature Range-40°C to +120°C
Torque Specification2.5-45 Nm depending on size

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 952:2013, DIN 40430, IEC 62444:2010, UL 514B

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Thread galling in aluminum components
  • Over-compression damaging cable insulation
  • Corrosion in marine/chemical environments
  • Incorrect installation compromising IP rating
  • Electrolytic corrosion when mating with dissimilar metals
FMEA Triads
Trigger: Incorrect installation torque
Failure: Inadequate sealing leading to water ingress
Mitigation: Use calibrated torque wrenches and follow manufacturer specifications
Trigger: Missing or damaged sealing ring
Failure: Complete loss of environmental protection
Mitigation: Visual inspection before installation and mandatory replacement of sealing components
Trigger: Thread contamination or damage
Failure: Cross-threading or inability to achieve proper compression
Mitigation: Clean threads before installation and use thread lubricant where specified

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Thread tolerance: 6g per ISO 965-1, Hex flat tolerance: ±0.2mm, Compression surface concentricity: 0.1mm TIR
Test Method
IP testing per IEC 60529, Salt spray testing per ASTM B117, Torque testing per ISO 16047, Compression force testing with calibrated load cells

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Compression Nut

Manufacturer profiles associated with Compression Nut.

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Conductor Terminal
A conductor terminal is a critical electrical component designed to securely connect and terminate conductors in high-voltage insulating bushings, ensuring reliable electrical transmission and insulation integrity.

Frequently Asked Questions

What is the difference between compression nuts for aluminum vs. brass cable glands?

Aluminum compression nuts are lighter, more corrosion-resistant in certain environments, and typically anodized for insulation. Brass nuts offer better conductivity and are preferred in explosive atmospheres. Material choice depends on application requirements like weight, corrosion resistance, and grounding needs.

How do I determine the correct torque for a compression nut?

Refer to manufacturer specifications based on nut size and cable diameter. Generally, apply 1/4 turn past hand-tight for metric threads, or use torque values from the specs table. Over-torquing can damage the sealing ring, while under-torquing compromises the IP rating.

Can compression nuts be reused?

Limited reuse is possible if threads and compression surfaces are undamaged. However, the sealing ring should always be replaced. Aluminum nuts are more prone to thread galling than brass or stainless steel versions.

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.

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