Primary Industrial Showcase
Engineered Cable Gland Assemblies & Precision Components
Explore our top-tier double seal, armored, explosion-proof, and harsh-environment cable protection assemblies certified to international IP68, UL, and CE safety directives.
China China Metal Tubular Cable Gland - IP68 Rated, UL Listed, Reliable Suppliers & Factory for Industrial Applications Supplier, Factory
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Technical Anatomy & Engineering Nomenclature
Double Compression Cable Gland Parts Name: An Exploded Mechanical Analysis
Unlike standard single compression designs, a double compression cable gland provides dual sealing barriers: an inner seal that acts directly on the cable inner sheath, and an outer compression seal that grips the external oversheath. Below is the industry-standard exploded parts name breakdown used by OEM engineers, EPC contractors, and global test laboratories.
1. Entry Thread & Gland Body
The core structural hub screwed into the apparatus or electrical cabinet enclosure. Machined in Metric (ISO 965 M12 to M100), NPT (ANSI/ASME B1.20.1), PG (DIN 40430), or G/BSPP forms, it provides thread engagement depth capable of resisting internal explosion pressure (Flameproof Ex d) and structural pullout loads.
2. Inner Sealing Ring (Inner Grommet)
The primary environmental and gas-tight containment ring. Fabricated from high-grade elastomeric compounds such as Neoprene, Silicone, or EPDM, this element is axially displaced during assembly to generate uniform radial compression across the cable's bedding or inner protective sheath, achieving certified IP68 water ingress deterrence.
3. Armor Clamping Cone (Inner Cone)
A precision-tapered metallic ring designed to receive the flared wire strands, braid, or steel tape armor of industrial cables (SWA, STA, AWA). Its conical inclination angle is calculated to distribute clamping forces evenly without pinching or shearing individual conductive wires.
4. Armor Clamping Ring / Sleeve
Works as the female locking counterpart to the armor cone. Under axial torque applied by the middle body, the clamping ring drives the armor firmly against the cone surface, forming a low-impedance electrical continuity path essential for fault-current earthing and electromagnetic shielding (EMC).
5. Middle Body / Intermediate Union
The mechanical transitional coupling that separates inner and outer sealing chambers. Tightening the middle body compresses the inner seal ring and securely locks the armor clamping assembly prior to disturbing or manipulating the cable's external outer sheath.
6. Outer Sealing Ring & Skid Washer
The secondary weather-tight barrier resting on the cable exterior. Accompanied by a low-friction nylon or brass skid washer that stops rotational shear forces from distorting the outer elastomer during final nut tightening, delivering dependable IP66/IP67/IP68 submersion integrity.
7. Outer Compression Nut (Cap Nut)
The external hexagonal closing nut. Threaded directly onto the middle union body, it applies calibrated axial preload down through the skid washer to compress the outer seal ring, simultaneously establishing robust mechanical cable retention and strain relief preventing axial slippage.
8. Critical Ancillaries: Locknut, Earth Tag & Shroud
Ancillary components include heavy-duty locknuts (brass/stainless steel) for clearance holes, copper/brass Earth Tags tested for high fault-current carrying capacity, and UV/Ozone-resistant PVC, PCP, or LSF silicone shrouds offering corrosion buffering in marine salt spray atmospheres.
| Part Name (Standard Nomenclature) | Primary Material Alloys | Mechanical / Sealing Function | Governing Engineering Standard |
|---|---|---|---|
| Gland Body (Entry Component) | Brass CW614N/CW617N, SS304, SS316L, Aluminum 6082 | Enclosure coupling, flamepath propagation barrier | BS 6121, EN 62444, IEC 60079-1 (Ex d) |
| Inner Compression Seal | High-Grade Chloroprene, Fluorocarbon (FKM), Silicone | Gas-tight barrier on inner bedding, flame extinguishment | IEC 60529 (IP68), UL 2225 explosion containment |
| Armor Cone & Clamping Ring | CuZn39Pb3 Brass, Aluminum, Austenitic Stainless | 360° mechanical lock of SWA / STA armor, earth bonding | BS 6121 Part 1, EN 50262 Type E1W / E1X |
| Middle Interlocking Union | Electroless Nickel-Plated Brass, SS316 Marine Grade | Isolates inner compression from outer cable flexure | ISO 965 Metric, ANSI/ASME B1.20.1 NPT |
| Outer Compression Elastomer | EPDM, Neoprene, Low-Smoke Halogen-Free Rubber | External environmental moisture barrier & cable retention | IEC 62444 (Cable Anchorage Type B) |
| Compression Cap Nut | Machined Hexagonal Brass / Marine SS316L | Terminal torque transmission and strain relief | DIN 89280, JIS F8801, UL 514B pullout strength |
20+
Years Manufacturing History
Continuous factory production since 2006
80+
Skilled Technical Specialists
Liushi, Yueqing high-tech enterprise facility
800+
Global B2B Enterprise Clients
Offshore, mining, EV and energy panel builders
5M
RMB Registered Capital
Audited manufacturing capability and scale
Enterprise Procurement Demands
Procurement Criteria Across Global EPCs, Refineries & Utilities
When global engineering firms procure double compression cable glands from China suppliers and factories, technical procurement managers operate under rigid verification protocols to prevent field catastrophic failures.
Gas Group IIC & Dust Zone 20/21 Compliance
Refinery, LNG liquefaction, and chemical processing complexes require explosion-proof cable glands with dual certifications under ATEX (Directive 2014/34/EU) and IECEx schemes. Glands must satisfy Flameproof (Ex d), Increased Safety (Ex e), Restricted Breathing (Ex nR), and Dust Ignition Protection (Ex tb) requirements across gas groups IIA, IIB, and hydrogen-rich IIC.
Severe Marine Corrosion & Metallurgy Verification
Offshore wind farms, FPSO vessels, and marine drillships mandate high-copper CW614N nickel-plated brass with minimum 12–15 μm coating thickness, or austenitic 316L stainless steel containing 2.0–3.0% molybdenum. Verification includes 1000+ hour neutral salt spray (ASTM B117) and stress corrosion cracking (ISO 7539) resistance.
Dynamic Thermal Range & Cold Flow Resistance
Extreme climate infrastructure—from Arctic LNG terminals (-60°C) to Middle Eastern desert solar installations (+130°C)—demands that elastomers maintain Shore A hardness without glass transition brittleness or polymer plasticizer leaching, preventing inner seal "cold flow" phenomena along cable polymers.
Sector Engineering Blueprints
Macro Industry Applications & Mission-Critical Deployments
How HOONSUN (Zhejiang Hongxiang Connector Co., Ltd.) double compression cable glands maintain uninterrupted power transmission and telemetry throughout harsh industrial environments.
Offshore Oil Platforms & FPSO Hull Enclosures
Offshore topside modules feature steel wire armored power feeders that encounter continuous wave slamming and saline deluges. Double compression marine glands provide an uncompromised barrier: the inner seal isolates internal electrical switchgear from gaseous migration along cable capillaries, while the outer seal stops galvanic seawater intrusion into the steel armor.
Renewable Energy Substations & BESS Systems
Battery Energy Storage Systems (BESS) and gigawatt-scale solar inverters handle heavy DC busbars with substantial electromagnetic interference. Double compression glands with 360-degree brass armor cones ground shield braid instantaneously, dissipating transient surges, harmonic interference, and lightning strikes directly into the enclosure earth grid.
Heavy Automation, Robotics & Rolling Stock Rail
Subway bogies, trackside signaling enclosures, and six-axis industrial robotics generate extreme multi-axial vibration. The mechanical separation between inner gland locknut and outer compression nut guarantees that constant cable flexing cannot loosen internal sealing rings or unseat armor grounding contacts.
Future Trends & Supply Chain Dynamics
Technology Roadmap & China Manufacturing Ecosystem
The industrial cluster of Liushi, Yueqing in Zhejiang Province has transformed from high-volume component machining into an advanced, automated hub for precision hazardous-area connectors and next-generation liquid cooling solutions.
The Liushi, Yueqing Industrial Manufacturing Cluster
China's "Electrical Capital," Liushi, combines fully integrated raw material smelting, high-precision Swiss-type CNC multi-axis automatic turning, automated injection molding, and testing laboratories within a 15-kilometer radius. HOONSUN leverages this proximity to maintain short lead times, direct control over bar-stock brass purity (avoiding recycled leaded brass), and complete traceability from ingot to final boxed assembly.
Next-Gen Smart Condition-Monitoring Glands
The industry's engineering horizon is moving toward "Connected Glands." Smart double compression glands currently under pilot validation incorporate micro-piezoelectric torque sensors and internal humidity transponders. By streaming wireless BLE or LoRaWAN alerts, these units alert offshore operators to seal degradation or loosened compression nuts before moisture ingress can ground a high-voltage motor circuit.
Halogen-Free Elastomer Evolution (LSOH)
Stricter railway (EN 45545-2) and marine fire safety rules demand low-smoke, zero-halogen (LSZH) elastomeric seals. Modern double compression sealing rings eliminate traditional halogenated vulcanizing agents, producing zero toxic dioxin or corrosive hydrogen chloride gas emissions during flashover fires inside enclosed marine passenger vessels or subway tunnels.
Audited Factory Quality
Compliance Assurance, Factory Quality & On-Site Audits
International buyers visiting the Canton Fair (Booth 20.1G03) or Middle East Energy (Stand H8-B55) verify HOONSUN's end-to-end quality systems through rigorous quality metrics.
100% In-House Thread & Tolerance Metrology
Every batch of double compression entry threads is checked with calibrated Go/No-Go thread pitch ring gauges to ANSI/ASME B1.20.1, BS 3643, and ISO 965 limits. In-house optical profile projectors verify armor cone taper angles and inner sleeve chamfers to an accuracy of 0.005 mm.
Hydrostatic Ingress Testing (IP68 @ 5–10 Bar)
Standard random sampling exposes fitted cable glands to 10-bar hydraulic immersion in deep-well testing chambers for up to 72 continuous hours, simulating 100 meters of submersion. This confirms the inner and outer seals maintain absolute resistance to capillary moisture absorption.
Dynamic Armor Tensile Pull-Out Testing
In accordance with BS 6121 and IEC 62444, assembled armor clamping cones are placed under hydraulic tensile stress tests to confirm cable armor will exceed the required 300–5000 Newton tensile retention threshold before slipping from the internal conical seat.
Direct Engineering FAQ
Frequently Asked Questions: Double Compression Cable Glands
Get practical, technically rigorous answers regarding component part names, correct assembly sequences, thread specifications, and global compliance.
What is the functional difference between single and double compression cable glands?
A single compression cable gland compresses a single elastomeric seal onto the cable outer sheath, primarily providing ingress protection and mechanical strain relief for non-armored cables. In contrast, a double compression cable gland features two distinct elastomeric seals plus an intermediate armor clamping cone. The inner seal clamps directly onto the inner cable bedding/sheath, creating a flameproof and gas-tight barrier (Ex d/Ex e). The outer seal clamps down onto the exterior jacket, providing weatherproofing (IP68) and strain relief, while the armor cone locks the metallic armor (SWA, STA) for ground fault continuity.
What are the exact parts names in a standard double compression cable gland?
An exploded double compression cable gland comprises: (1) Entry Threaded Body, (2) Inner Elastomeric Sealing Ring, (3) Armor Clamping Cone (Male), (4) Armor Clamping Ring/Sleeve (Female), (5) Middle Interlocking Body / Union Nut, (6) Outer Elastomeric Sealing Ring, (7) Friction Skid Washer, and (8) Outer Compression Cap Nut. Supplementary accessories include the Locknut, Sealing O-ring/Washer, Earth Tag, and protective Outer PVC/LSOH Shroud.
What types of cable armor can be clamped by double compression glands?
Double compression cable glands clamp various armor constructions depending on cone geometry: Steel Wire Armor (SWA - Type E1W), Steel Tape Armor (STA - Type E1X), Aluminum Wire Armor (AWA), Galvanized Steel Braid, and Pliable Wire Armor. Reversible armor cones ("W" and "X" stepped profiles) accommodate both single-strand round wire and thin pliable metallic tapes within a single universal fitting.
Why is nickel-plated brass widely preferred over bare brass?
Bare brass forms non-conductive surface copper oxides and green patina when exposed to airborne moisture, industrial sulfur compounds, and salt spray. An electroplated nickel barrier layer (typically 10 to 15 microns thick) prevents galvanic corrosion, stops atmospheric dezincification, lowers thread friction during high-torque tightening, and preserves low-impedance electrical bonding with copper earth tags across decades of service.
How do you determine the correct tightening torque for inner and outer compression nuts?
Tightening torque depends on the thread pitch diameter and the Shore A hardness of the internal seals. For example, Metric M20 glands typically require 25 to 35 Nm of torque on the middle body to achieve inner seal seating, and 20 to 30 Nm on the outer cap nut. Over-tightening must be avoided to prevent pinching the cable bedding or compromising the core insulation. Manufacturers provide certified torque ranges for each size on their product datasheets.
Can HOONSUN supply custom thread standards and extended thread lengths for thick enclosures?
Yes. Operating automated Swiss-style CNC multi-axis turning centers in Liushi, HOONSUN provides Metric (M12 to M100), NPT (1/4" to 4"), PG (PG7 to PG48), and G/BSPP threads. Thread reach can be lengthened from the standard 15 mm up to 30 mm+ for cast-iron explosion-proof enclosures or thick aggregate substation walls.
Complete Technical Product Program
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Configure & InquireNeed Project-Specific Double Compression Gland Drawings?
Send your cable specifications (conductor count, armor type, bedding OD, outer jacket OD) directly to our Yueqing engineering department for certified 2D/3D CAD models, material mill test certificates, and factory-direct volume pricing.