Description
Comet Single Compression Brass Cable Gland Size 63mm (2-1/2”)
The Comet Single Compression Brass Cable Gland Size 63mm (2-1/2”) is designed for cable-entry applications where a 63mm single compression brass cable gland is specified.
The product is identified by both 63mm and 2-1/2 inch sizing, making it easier for electrical contractors, panel builders, maintenance teams and purchasing departments to identify the required gland when project documents or supplier catalogues use different measurement systems.
A cable gland is more than a threaded metal fitting. It is part of the cable-entry arrangement between the cable and the electrical enclosure or equipment. Selecting the correct gland requires attention to the actual cable dimensions and construction.
For that reason, do not select this 63mm gland only from the cable’s conductor size.
The finished cable’s outside diameter is one of the important dimensions to check. Cable construction, insulation, sheath and manufacturer can affect the final cable diameter. A 63mm gland should therefore be matched against the applicable manufacturer specification before purchase.
For reference, other published 63mm single-compression gland listings identify the product as a 63mm / 2-1/2 inch single compression brass cable gland. Some supplier charts associate 63mm with 240 sq.mm 3.5-core cable, but such cable-size charts are explicitly described as approximate and dependent on cable thickness and make.
Use the actual cable OD and manufacturer’s specification as the final selection criteria.
Key Product Information
| Specification | Details |
| Brand | Comet |
| Product Type | Single Compression Brass Cable Gland |
| Size | 63mm |
| Inch Size | 2-1/2” |
| Material | Brass |
| Compression Type | Single Compression |
| Application | Cable Entry |
| Product Category | Cable Gland |
| Supplier | Thunderbolt Electromech India Pvt. Ltd. |
Note: Thread standard, finish, sealing range and other technical dimensions should be confirmed from the manufacturer’s product specification for the exact Comet product supplied.
Why Is 63mm Cable Gland Selection Important?
A common purchasing mistake is to assume that the gland size can be selected directly from the cable’s sq.mm rating.
That approach is unreliable.
The conductor cross-section tells you about the conductor. The cable gland interacts with the completed cable, including its insulation and outer sheath.
For example, published cable-gland selection tables may associate a 63mm gland with a particular cable construction and conductor size, but the same sources warn that those associations are approximate because cable dimensions vary by construction and manufacturer.
So, before purchasing the Comet 63mm Cable Gland, check:
- Cable outer diameter
- Cable construction
- Cable type
- Single or double compression requirement
- Armoured or unarmoured construction
- Enclosure entry
- Thread requirement
- Environmental conditions
- Required ingress protection
- Manufacturer’s gland specification
This small checking step can prevent an otherwise expensive ordering mistake.
How to Check Whether a 63mm Cable Gland Is Suitable
1. Check the cable datasheet
Start with the cable manufacturer’s technical datasheet.
Look for the overall cable diameter / outer diameter.
2. Check the cable construction
Don’t stop at the conductor size.
Identify whether the cable is armoured or unarmoured and note its construction.
3. Check the gland type
This product is a single compression cable gland.
If the installation specification requires a double compression gland, a single compression product should not be substituted simply because both products have a 63mm nominal size.
4. Check the enclosure entry
The gland’s entry thread must be compatible with the enclosure or equipment into which it will be installed.
5. Check the environmental requirement
For exposed or demanding installations, verify the required ingress protection and sealing arrangement.
Thunderbolt’s cable-gland material explains why IP rating should be considered as part of the gland and enclosure selection rather than treated as an isolated number.
6. Confirm before ordering
For a large gland such as 63mm, give the supplier the complete information:
Cable type + cable OD + construction + gland type + size + thread + quantity
That is much more useful than simply saying:
“I need a 63mm gland.”
Single Compression vs Double Compression
This distinction matters.
A single compression cable gland and a double compression cable gland are not interchangeable simply because the nominal gland size is identical.
The correct choice depends on the cable construction and installation requirement.
If your cable is armoured, check the specified gland arrangement before ordering. Thunderbolt’s armoured-versus-unarmoured guide explains the selection difference in more detail.
For a project that specifically specifies a Comet 63mm Single Compression Brass Cable Gland, this product should be evaluated against the manufacturer’s dimensions and the actual cable being installed.
Where Can a 63mm Cable Gland Be Used?
The exact application depends on the cable, equipment and project specification.
Suitable cable-entry applications may include:
- Electrical panels
- Industrial enclosures
- Control equipment
- Electrical distribution equipment
- Industrial machinery
- Power-related equipment
- Cable-entry systems
- Electrical installation projects
- Maintenance and replacement work
The important point is that the application does not determine the gland size by itself.
For outdoor and enclosure applications, also review our guide to IP rating on cable glands.
Common Problems When Buying a Large Cable Gland
| Customer problem | Why it happens | Better approach |
| Gland doesn’t fit the cable | Cable OD wasn’t checked | Check actual cable OD |
| Gland is too loose | Cable is outside the specified sealing range | Match OD with manufacturer’s range |
| Gland doesn’t fit enclosure | Wrong thread or entry specification | Verify enclosure entry |
| Single compression selected for wrong cable | Cable construction wasn’t checked | Confirm cable type first |
| Buyer selects from sq.mm only | Conductor size doesn’t give complete gland information | Check finished cable diameter |
| Wrong quantity ordered | Project requirement wasn’t consolidated | Prepare a size-wise purchase list |
Cable Gland Size: Don’t Confuse Nominal Size With Cable Diameter
This question comes up frequently in cable-gland purchasing.
A 63mm cable gland does not automatically mean that the cable itself has a 63mm outside diameter.
The gland’s nominal designation identifies the gland size within its product range. The actual cable acceptance depends on the gland design and specified dimensions.
Published 63mm gland information, for example, associates the size with certain cable constructions but also states that cable-size recommendations are approximate because cable thickness and make vary.
That’s why the safest purchasing method is:
Cable datasheet → cable OD → gland specification → thread → installation requirement.
Not sure whether 63mm is the correct size? Read our cable gland size selection guide and check the cable’s actual outside diameter before ordering.
Why Choose Thunderbolt Electromech India Pvt. Ltd.?
Thunderbolt Electromech India Pvt. Ltd. supplies electrical cable glands for industrial, commercial and project requirements.
The current Thunderbolt product range includes Comet cable glands in multiple sizes, including 50mm, 57mm, 63mm, 70mm, 75mm, 82mm and 88mm.
This is useful when a project requires several gland sizes rather than one isolated item.
Thunderbolt can also help buyers identify the appropriate product based on the information supplied with the enquiry. For a cable gland enquiry, providing the cable OD, cable construction, required gland type and quantity makes the selection process much clearer.
Thunderbolt Electromech is based in Delhi and supplies electrical products to customers across India.
Contact Thunderbolt Electromech
Thunderbolt Electromech India Pvt. Ltd.
Shop No. 3538, Sitaram Bazar Road, Bazar Sirkiwalan, Chawri Bazar, Chandni Chowk, Delhi – 110006
Phone: +91-9911886655
Email: info@thunderboltelectromech.com
For bulk or project requirements, share the required gland sizes and quantities so the enquiry can be handled as a complete requirement rather than as individual product searches.
FAQs
1. What is a 63mm cable gland?
A 63mm cable gland is a gland-size designation used for a particular cable-entry product. The corresponding inch designation is 2-1/2 inch. The actual cable compatibility must be checked against the manufacturer’s specified dimensions.
2. Is a 63mm cable gland suitable for every 240 sq.mm cable?
No. A published selection chart may associate 63mm with 240 sq.mm 3.5-core cable, but such tables are approximate and can vary with cable construction, thickness and manufacturer.
Check the actual cable OD before ordering.
3. What is the difference between a 63mm single and double compression cable gland?
Both may have the same nominal size, but their construction and compression arrangements differ. The correct type depends on the cable construction and project specification. A 63mm single compression gland should not automatically replace a specified double compression gland.
4. How do I choose the correct cable gland size?
Start with the cable manufacturer’s datasheet and identify the overall cable diameter. Then compare that measurement with the gland manufacturer’s specified cable range. Also check the cable construction, thread and installation requirements.
5. Does cable sq.mm determine cable gland size?
No. Cable sq.mm describes conductor cross-sectional area. Cable gland selection also requires information about the completed cable, particularly its outside diameter and construction.
6. Is the Comet 63mm cable gland made of brass?
The product is identified as a Single Compression Brass Cable Gland. Brass is also listed as the material for Comet 63mm single-compression products in independent product information.
For exact alloy grade, finish and technical dimensions, verify the manufacturer’s specification for the specific Comet product supplied.
7. Can I order Comet cable glands in different sizes from Thunderbolt?
Yes. Thunderbolt’s current catalogue shows Comet single-compression brass glands across multiple sizes, including 50mm, 57mm, 63mm, 70mm, 75mm, 82mm and 88mm.
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