A compression cable gland is a metal cable entry fitting that seals and grips a cable by tightening a compression nut over internal sealing parts. In one assembly, it handles sealing at the entry point and cable strain relief on the cable outer sheath.
In the standard single compression style, one main compression point does the work. As the nut is tightened, the internal parts close around the cable jacket and form the seal. That makes this type a common choice for junction boxes, control cabinets, motors, lighting equipment, and general industrial wiring.
This is different from a simple nylon push-in fitting, which is usually used for lighter-duty cable entry. It is also different from a gland intended specifically for armored cable termination. In this category, the goal is straightforward metal cable entry, sealing, and retention.
How a Single Compression Gland Works
The standard terminology used on the product pages includes body, compression nut, claw, hermetic seal, and O-Ring. Some versions also include a metal washer.
Main parts and materials
| Part | Function | Material facts from the product pages |
|---|---|---|
| Body | Mounts into the enclosure and supports the assembly | Nickel-plated brass on standard brass models. SS304 or SS316L on stainless models |
| Compression nut | Drives the tightening action | Metal construction matching the gland design |
| Claw | Grips the cable for cable strain relief | PA66 nylon on the stainless single compression page, UL94-V2 |
| Hermetic seal | Creates the main sealing contact around the cable | EPDM or silicone rubber |
| O-Ring | Seals the entry interface | EPDM or silicone rubber |
| Metal washer | Supports the assembly on some standard versions | Nickel-plated metal washer |
The working principle is simple. The cable passes through the gland body and internal parts. When the compression nut is tightened, the claw closes on the cable and the sealing element is compressed into place. That creates the sealing effect and helps resist pull, movement, and vibration at the entry point. For standard brass versions, the body is nickel-plated brass. For stainless options such as the PG29 single compression design, the body material is SS304 or SS316L, with a PA66 claw and EPDM or silicone rubber sealing parts. If you want the standard brass single compression product page, use this URL:
Single Compression vs Double Compression Cable Glands Explained
Single compression and double compression glands solve related problems, but they are not the same product structure.
| Feature | Single compression | Double compression |
|---|---|---|
| Sealing concept | One main compression point | Two compression points |
| Typical use focus | General sealing and cable strain relief | Added sealing support where cable construction or service conditions call for it |
| Structure | Simpler | More complex |
If the job is standard cable entry into an enclosure, a single compression cable gland is often the direct choice. If the environment is harsher, or the cable design needs added sealing support, the extra seal in a double compression gland can matter. For the full double compression explanation, see:
For outdoor weather exposure considerations, see:
Temperature and Protection Ratings by Model
One selection rule should stay fixed. Different models have different IP and temperature ratings. You should choose by the exact product specification page, not by assuming every compression cable gland has the same sealing level.
Standard single compression model
The standard brass single compression page lists:
- Protection degree: IP54
- Static temperature: -40°C to 100°C, short time to 120°C
- Dynamic temperature: -20°C to 80°C, short time to 100°C
This makes the basic model suitable for many general industrial cable entries where basic dust and splash protection is enough.
M type metal waterproof model
The M type metal waterproof cable gland page lists:
- Protection degree: IP68
- Static temperature: -60°C to 250°C
That is a clear step up from the base IP54 version when higher sealing performance is required.
Stainless single compression model
The stainless single compression page lists:
- Protection degree: IP68-10 bar
- Static temperature: -40°C to 100°C, short time to 120°C
- Dynamic temperature: -20°C to 80°C, short time to 100°C
The practical takeaway is that IP54, IP68, and IP68-10 bar are not interchangeable. The correct rating depends on the enclosure, the environment, and the exact gland model. The product pages should be treated as the final reference for selection.
Thread and Cable Diameter Selection
A compression cable gland only performs correctly when the thread standard and cable clamping range both match the job. The M type product page lists these thread sizes and cable ranges:
| Thread size | Cable range |
|---|---|
| M12 × 1.5 | 4 to 6.5 mm |
| M12 × 1.5 | 5 to 8 mm |
| M14 | 5 to 8 mm |
| M16 | 6 to 9 mm |
| M18 | 8 to 12 mm |
| M20 × 1.5 | 8 to 12 mm |
| PG7 | 2 to 5 mm or 4 to 8 mm |
| PG9 | 3 to 6 mm or 5 to 10 mm |
| PG11 | 4 to 8 mm or 6 to 12 mm |
Across the documented product pages, thread options include M, PG, G, and NPT. The first step is to match the entry thread to the enclosure or equipment. The second step is to match the actual cable outer diameter to the listed clamping range. That second step is where mistakes often happen. The gland does not size itself by conductor count or cable name alone. The outer diameter is what determines whether the claw and sealing parts can compress correctly.
Materials and Certifications
Material choice affects corrosion resistance, service life, and where the gland should be used.
Nickel-plated brass
Nickel-plated brass is listed on the standard single compression page and the M type IP68 page. For many industrial installations, it is the standard material because it combines mechanical strength with good corrosion resistance and a familiar metal finish for enclosure hardware.
Stainless steel
The stainless single compression page lists SS304 and SS316L body options. Stainless is the stronger candidate when the application needs higher corrosion resistance than brass. That same page also lists a PA66 nylon claw with UL94-V2, plus EPDM or silicone rubber for the hermetic seal and O-Ring.
Certifications
The M type IP68 page lists these certifications:
- CE
- RoHS
- REACH
- UL
If your purchasing process requires documented compliance points before supplier approval, those are the listed certifications on that product page.
Installation Notes
Installation quality directly affects sealing. Even a properly selected gland can underperform if the parts are assembled incorrectly. A few general checks apply across standard installations:
- Confirm the thread type before assembly. M, PG, G, and NPT are different standards.
- Check the cable outer diameter against the gland’s clamping range.
- Make sure the cable passes cleanly through the claw and sealing parts.
- Check that the seal, O-Ring, and washer are seated correctly and aligned with the body.
- Tighten the compression nut enough to create sealing and cable strain relief, but do not overtighten.
- Inspect the finished assembly to confirm the outer sheath is the section being clamped.
Typical Applications
A standard single compression metal gland is commonly considered for:
- Junction boxes
- Control panels
- Motors
- Industrial lighting
- Automation equipment
- Outdoor electrical enclosures when the selected IP rating matches the environment
- Renewable energy equipment and related field wiring when the material and sealing level fit the site conditions
The application list is broad, but the rating still decides the fit. A basic IP54 gland and a higher-rated IP68 gland should not be treated as the same product in field exposure.
FAQ
Conclusion
Choosing a compression cable gland is ultimately about matching the product specification to the application requirements. A single compression gland remains a practical solution for many cable entry applications, offering reliable sealing, mechanical protection, and flexible installation options in a compact design. Before selecting a model, buyers should review the key technical parameters, including IP protection rating, operating temperature, thread specification, gland material, and compatible cable diameter range. A properly selected cable gland helps ensure long term sealing performance and reliable cable protection in the field.
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