China Global Leading Single Compression Gland Supplier & Suppliers

A single compression gland seals exclusively against the outer sheath of a cable through one radial elastomeric ring actuated by tightening the outer cap nut. It provides ingress protection and strain relief for unarmoured, tray, or flexible braided cables. In contrast, double compression glands feature two separate sealing rings: an inner seal that grips the internal cable bedding, an internal mechanical cone assembly that clamps metallic armour (SWA, AWA, or steel tape), and an outer seal that seals the outer jacket. Single compression glands are simpler, lighter, quicker to install, and ideal for non-hazardous or increased safety (Ex e) installations where mechanical armour anchoring is handled separately.

IP68 is not a generic static stamp; according to IEC 60529, testing requires continuous submersion under specific hydrostatic parameters agreed upon by manufacturer and user (HOONSUN certifies standard units to 5 bar / 50 meters for 30 days). This rating is strictly dependent on using the exact cable diameter range specified on the datasheet and applying the calibrated installation torque (Nm). Under-torquing leaves radial capillary leak paths, while over-torquing crushes the internal lamellar cage and induces shear failure in the elastomer, destroying the hermetic seal.

For environments with continuous salt-spray exposure, marine chlorides, or acid vapor washdowns, AISI 316L (EN 1.4404) stainless steel is strongly advised due to its high molybdenum content (2.0–2.5%), providing exceptional resistance against localized chloride pitting and crevice corrosion (PREN ≥ 25). For less corrosive maritime decks, naval-grade CW614N/CW617N brass with minimum 10 µm electrolytic nickel plating offers exceptional longevity at a lower purchase cost. Galvanic compatibility with the enclosure wall metal must always be confirmed to avoid galvanic corrosion.

Yes. When specified with our ATEX / IECEx certified configuration, our single compression glands comply with standards for Increased Safety (Ex e), Flameproof enclosures with volume constraints (Ex d), and Dust Ignition Protection (Ex tb) under Zone 1, 2, 21, and 22. Certified units use dedicated explosion-proof elastomeric formulations, verified flame paths along the entry threads, and locknut earth bonding tags to dissipate dangerous static charges. Always consult the specific certificate marking code (e.g., II 2 GD Ex eb IIC Gb / Ex tb IIIC Db) before installation.

Cold-flow or creep occurs when thermoplastic cable jackets (such as PVC or low-grade polyethylene) flow under continuous mechanical clamping pressure, leading to loose glands and loss of ingress protection over time. HOONSUN tackles this through calibrated conical lamellar clamping baskets engineered from resilient PA66 polymers, paired with wide-profile chloroprene/NBR compression rings. This geometry distributes retention load over a wider axial area rather than a sharp knife-edge contact, keeping clamping stress below the critical yield threshold of modern industrial jackets.

HOONSUN provides standard entry thread lengths (typically 5 mm to 10 mm for sheet metal junction boxes) and extended thread options (15 mm to 25 mm) engineered specifically for thick-walled cast aluminum, ductile iron explosion-proof enclosures, or heavy machine frames. We manufacture precision Metric threads (pitch 1.5 mm standard), PG threads (DIN 40430), American NPT threads (with 1:16 taper ratio), and parallel Gas threads (G / BSPP). Custom thread lengths can be turned on-demand via our multi-axis CNC machines.

Because our machining, moulding, and automated laser marking operations are centralized in Liushi, Yueqing, we offer flexible OEM terms. Standard catalog parts typically have a low MOQ of 500 to 1,000 units with immediate stock dispatch within 48 to 72 hours. Custom private-label programs—including bespoke laser-etched logos, custom hex body dimensions, unique clamping ranges, or specific colored anodized finishes—typically require a 3,000 to 5,000 unit batch size with prototype tooling samples ready in 7 days and full batch dispatch in 15 to 20 business days.

Every production lot shipped from our factory is backed by comprehensive traceability records. Upon request, we provide a complete Documentation Binder containing: EN 10204 3.1 chemical and mechanical material mill certificates, dimensional CMM inspection reports, IP68 hydrostatic test sign-offs, RoHS 3 and REACH compliance letters, and copies of UL, CE, and ATEX approvals. This turnkey transparency enables seamless tier-1 enterprise supplier audits and fast-tracks global customs clearance.