Description

HMI Brass Cable Gland 57mm (2-1/4”) – Single & Double Compression

The HMI Brass Cable Gland 57mm (2-1/4”) – Single & Double Compression is a large-size cable-entry solution available in SC057 Single Compression and DC057 Double Compression configurations.

HMI’s cable-gland range identifies 57mm (2-1/4″) as one of its standard sizes. The manufacturer’s current range specifies nickel-plated brass construction and BSC (British Standard Conduit) entry thread. HMI differentiates its Single Compression and Double Compression designs according to cable construction and the way the cable sheath and armour are secured.

For a 57mm gland, correct sizing becomes particularly important. 57mm should not automatically be interpreted as the cable’s outside diameter or the maximum cable OD. Actual cable OD, armour construction, thread, enclosure entry and the manufacturer’s applicable selection data should be checked before ordering. Other manufacturers’ 57mm products demonstrate that the usable cable diameter can differ substantially from the nominal gland designation.

For a detailed selection process, see the Thunderbolt Cable Gland Supplier India: 15 Expert Tips to Choose the Right Cable Gland.

HMI 57mm Single Compression Cable Gland – SC057

The HMI SC057 is the Single Compression version of the 57mm (2-1/4″) cable gland.

HMI lists its Single Compression range for indoor or outdoor applications with armoured or unarmoured cables. Its primary function is to grip the outer sheath of the cable.

The range is manufactured in nickel-plated brass and uses a BSC entry thread. HMI lists Earth Tag and Shroud as accessories available on request.

Single Compression SC057 Specification Table

Specification	HMI SC057
Product Type	Single Compression Cable Gland
HMI Code	SC057
Gland Size	57mm (2-1/4”)
Material	Nickel-Plated Brass
Entry Thread	BSC – British Standard Conduit
Cable Type	Armoured / Unarmoured
Main Function	Grips outer sheath of cable
Application	Indoor / Outdoor
Accessories	Earth Tag, Shroud available on request

Why consider SC057?

SC057 is relevant when a project requires a 57mm HMI Single Compression gland and the cable and installation meet the applicable selection requirements.

For cable sizing, read What Size Cable Gland Do I Need for My Project?.

HMI 57mm Double Compression Cable Gland – DC057

The HMI DC057 is the Double Compression version of the 57mm (2-1/4″) cable gland.

HMI specifies its Double Compression range for indoor or outdoor applications with armoured cables. The design seals and grips the inner and outer sheath, while the cone and ring clamp the armour.

The range uses nickel-plated brass construction with a BSC entry thread. HMI lists Earth Tag, Shroud, Stop Plug and Reducer/Adaptor as accessories available on request.

Double Compression DC057 Specification Table

Specification	HMI DC057
Product Type	Double Compression Cable Gland
HMI Code	DC057
Gland Size	57mm (2-1/4”)
Material	Nickel-Plated Brass
Entry Thread	BSC – British Standard Conduit
Cable Type	Armoured
Main Function	Seals/grips inner & outer sheath and clamps armour
Application	Indoor / Outdoor
Accessories	Earth Tag, Shroud, Stop Plug, Reducer/Adaptor available on request

For more information about choosing between the two configurations, read Armoured vs Unarmoured Cable Glands: Which One Do You Actually Need?.

 

HMI SC057 vs DC057 – Comparison

Feature	SC057 Single Compression	DC057 Double Compression
HMI Code	SC057	DC057
Nominal Gland Size	57mm (2-1/4”)	57mm (2-1/4”)
Compression Type	Single	Double
Cable Type	Armoured / Unarmoured	Armoured
Outer Sheath Grip	Yes	Yes
Inner Sheath Sealing/Grip	Not stated as primary function	Yes
Armour Clamping	Not stated as primary function	Yes
Material	Nickel-Plated Brass	Nickel-Plated Brass
Entry Thread	BSC	BSC
Indoor/Outdoor	Yes	Yes
Earth Tag	Available on request	Available on request
Shroud	Available on request	Available on request
Stop Plug	—	Available on request
Reducer/Adaptor	—	Available on request

Important: SC057 and DC057 should not be treated as interchangeable simply because both carry the 57mm designation. The cable construction and required termination arrangement determine which configuration is appropriate.

How to Select the Correct HMI 57mm Cable Gland

1. Check the Actual Cable Outside Diameter

The most important point when purchasing a large cable gland is to verify the complete cable’s actual outside diameter.

Do not assume:

57mm cable gland = 57mm cable OD.

The nominal gland designation does not by itself provide enough information to establish the acceptable cable diameter.

For example, published cable-gland specifications from other manufacturers show products identified around 57mm that have defined minimum and maximum cable diameters rather than accepting a cable of exactly 57mm.

Use the cable manufacturer’s datasheet or an accurate measurement of the complete cable.

Read:

What Size Cable Gland Do I Need for My Project?

 

2. Identify Armoured or Unarmoured Construction

The cable construction is essential when choosing between SC057 and DC057.

• SC057: HMI’s Single Compression range is listed for armoured and unarmoured cables.
• DC057: HMI’s Double Compression range is listed for armoured cables and incorporates armour clamping.

This makes the cable construction and termination requirement, rather than size alone, an important part of the selection process.

3. Verify the Thread

HMI specifies BSC (British Standard Conduit) entry thread for its Single Compression and Double Compression ranges.

Before ordering, confirm that the panel, enclosure or equipment entry matches the required thread.

4. Check the Installation Environment

HMI lists its Single and Double Compression ranges for indoor or outdoor applications, but the project may have additional environmental requirements.

Consider:

• Dust
• Moisture
• Outdoor exposure
• Cable-entry sealing
• Enclosure requirements
• Project-specified IP protection

For a useful explanation of cable-gland IP considerations, read:

What Is IP Rating on Cable Glands and Why Does It Matter?

Do not assign a specific IP rating to SC057/DC057 unless the applicable manufacturer documentation confirms it.

5. Check the Project Specification

Before purchasing a 57mm cable gland, confirm:

• Cable outside diameter
• Cable construction
• Armour type
• Single or Double Compression requirement
• Thread requirement
• Enclosure entry
• Installation environment
• Required accessories
• Manufacturer/project specification
• Quantity required

For large industrial cables, this information can prevent expensive incorrect-gland purchases.

Applications of HMI Brass Cable Gland 57mm

The HMI Brass Cable Gland 57mm can be considered for suitable industrial electrical panels, power distribution equipment, control equipment, electrical enclosures, industrial machinery, infrastructure projects and other cable-entry installations, subject to the cable and project specification.

The SC057 is the Single Compression option listed for armoured and unarmoured cables, while DC057 is the Double Compression option listed for armoured cables.

Large 57mm cable-gland products are commercially used in industrial applications, but the actual application should always be determined by the cable, gland specification and installation requirements rather than size alone.

For broader procurement guidance, visit the Cable Gland Supplier India pillar page.

Why Choose Thunderbolt Electromech India Pvt. Ltd. for Cable Glands?

Thunderbolt Electromech India Pvt. Ltd. supplies cable glands and industrial electrical accessories for engineers, contractors, panel builders, industries, OEMs and purchase departments.

1. Multiple Cable Gland Sizes

Thunderbolt’s current range includes HMI cable glands across multiple sizes, including 57mm (2-1/4″), as well as other large and small cable-gland sizes.

2. Single & Double Compression Options

Customers can select between Single and Double Compression configurations according to cable construction and project requirements.

3. Technical Selection Support

For large cable glands, customers can provide the cable OD, cable construction, gland type, thread and quantity to improve product identification.

4. Industrial Procurement

The range is suitable for requirements from electrical contractors, panel manufacturers, industrial maintenance teams, OEMs and project procurement departments.

5. Bulk Order Support

For industrial projects requiring multiple 57mm glands or mixed sizes, consolidated procurement can simplify ordering.

6. Pan-India Supply

Thunderbolt supports industrial electrical-product supply requirements across India.

7. Related Cable Accessories

Customers can also source other cable-management and electrical products alongside cable glands.

For the complete selection framework, read Cable Gland Supplier India: 15 Expert Tips to Choose the Right Cable Gland for Industrial Projects.

Frequently Asked Questions – HMI Brass Cable Gland 57mm

1. What is the HMI Brass Cable Gland 57mm?

The HMI 57mm cable gland is available in SC057 Single Compression and DC057 Double Compression configurations. The 57mm designation corresponds to 2-1/4″ in the HMI size range.

2. What is HMI SC057?

SC057 is the HMI Single Compression cable-gland configuration designated 57mm (2-1/4″). HMI’s Single Compression range is specified for armoured and unarmoured cables and grips the outer sheath.

3. What is HMI DC057?

DC057 is the HMI Double Compression cable-gland configuration designated 57mm (2-1/4″). HMI’s Double Compression range is specified for armoured cables and seals/grips the inner and outer sheath while clamping the armour.

4. What is the difference between SC057 and DC057?

SC057 is Single Compression and is listed for armoured and unarmoured cables.

DC057 is Double Compression and is listed for armoured cables, with a design that seals/grips the inner and outer sheath and clamps the armour.

Therefore, the choice depends on the cable construction and termination requirement.

5. Is a 57mm cable gland suitable for a 57mm cable?

Not automatically.

A 57mm (2-1/4″) gland designation should not be interpreted as confirmation that a 57mm OD cable will fit.

The manufacturer’s applicable cable-size range must be checked against the actual cable OD. This is especially important because different cable-gland designs can have different cable-diameter ranges even when their nominal size is similar.

6. Which HMI 57mm cable gland should I use for an armoured cable?

Both configurations may need to be considered depending on the project requirement.

• SC057: Single Compression; HMI lists the range for armoured and unarmoured cables.
• DC057: Double Compression; HMI lists the range for armoured cables and specifies armour clamping.

The project specification and cable construction should determine the final selection.

7. Can HMI SC057 be used for an unarmoured cable?

HMI lists its Single Compression range for armoured and unarmoured cables, so SC057 is the corresponding HMI Single Compression configuration. The actual cable OD and other installation requirements still need verification.

8. Is HMI DC057 suitable for an armoured cable?

HMI lists its Double Compression range for armoured cables, with the cone and ring described as clamping the armour. DC057 is therefore the corresponding 57mm Double Compression configuration when the other selection requirements are satisfied.

9. What material is the HMI 57mm Cable Gland?

HMI specifies nickel-plated brass for its Single Compression and Double Compression cable-gland ranges.

10. What thread does the HMI 57mm Cable Gland use?

HMI specifies BSC (British Standard Conduit) entry thread for the Single Compression and Double Compression ranges.

11. What accessories are available for HMI SC057?

HMI lists Earth Tag and Shroud as accessories available on request for the Single Compression range.

12. What accessories are available for HMI DC057?

For the Double Compression range, HMI lists Earth Tag, Shroud, Stop Plug and Reducer/Adaptor as available on request.

13. How do I select a 57mm cable gland for an industrial project?

Start with the actual cable OD, then identify:

1. Armoured or unarmoured construction
2. Required compression type
3. Thread
4. Enclosure entry
5. Environmental conditions
6. Required accessories
7. Project/manufacturer specifications

For the complete selection method, read the Cable Gland Supplier India pillar guide.