Cable Lug Size Chart: How to Choose the Right Cable Lug Size

Choosing the correct cable lug size is one of the most important steps in making a safe and reliable electrical connection. If the cable lug is too small, the conductor cannot be inserted properly. If the lug is too large, the crimping area may not hold the cable tightly, which can cause overheating, loose contact or electrical failure. This is why many engineers, contractors and purchasing managers search for a clear cable lug size chart before ordering cable lugs for power distribution, electrical panels, grounding systems or industrial equipment.

Cable lug size normally refers to the conductor cross-section that the lug is designed for. In many markets, this is shown in square millimeters, such as cable lug 16mm2, cable lug 25mm2, cable lug 35mm2, cable lug 50mm2, cable lug 70mm2, cable lug 95mm2, cable lug 120mm2, cable lug 150mm2, cable lug 240mm2, cable lug 300mm2, cable lug 400mm2, cable lug 500mm2 and cable lug 630mm2.

For a complete overview of cable lug materials, structures and custom manufacturing options, visit our main Cable Lug Manufacturer page.

What Does Cable Lug Size Mean?

Cable lug size should match the cable conductor size. For example, a cable lug 50mm2 is designed for a 50mm² conductor, while a cable lug 95mm2 is designed for a 95mm² conductor. The number does not usually mean the outside length of the lug. It normally refers to the cable cross-sectional area.

This is very important because some buyers may search for terms like cable lugs 185mm or 500mm2 cable lugs. In technical communication, it is better to confirm whether the buyer means 185mm² cable size, 500mm² cable size, or the physical length of the cable lug. For most electrical cable lug products, the size is about conductor cross-section, not the total product length.

A correct cable lug size should match three main points: the conductor size, the barrel inner diameter and the crimping die size. If these three factors do not match, the final connection may not be reliable.

Common Cable Lug Size Chart

The following chart gives a practical overview of common cable lug sizes and typical applications. Exact dimensions may vary depending on DIN, IEC, UL, customer drawings or manufacturer standards.

This type of chart is useful for initial selection, but final confirmation should always be based on cable conductor type, current rating, installation space, hole size and crimping tool requirements.

Small Cable Lug Sizes: 16mm2, 25mm2 and 35mm2

Small and medium cable lugs are widely used in control cabinets, electrical panels, grounding boxes, distribution boards and small industrial equipment.

A cable lug 16mm2 is commonly used for smaller power connections or grounding conductors. It is often paired with M6, M8 or M10 hole sizes, depending on the installation point.

A cable lug 25mm2 is used for slightly larger conductors in electrical distribution and equipment wiring. It is common in low-voltage cabinets, grounding connections and small battery systems.

A cable lug 35mm2 is often used for power cable connections in industrial machines, control panels, switchboards and grounding applications. Compared with 16mm² and 25mm² lugs, the 35mm² lug has a larger barrel and stronger current-carrying capability.

For these smaller sizes, buyers should pay attention to the mounting hole size. A 25mm² cable lug may be available with M6, M8, M10 or custom holes, so the cable size alone is not enough for ordering.

Medium Cable Lug Sizes: 50mm2, 70mm2 and 95mm2

Medium cable lug sizes are very common in industrial electrical systems. A cable lug 50mm2 is often used in power distribution boxes, battery connections, grounding bars and electrical equipment.

A cable lug 70mm2 is one of the most commonly requested sizes for power cable connections. Many buyers search for 70mm2 cable lugs because this size is widely used in distribution panels, industrial wiring, grounding systems and switchgear. A 70mm² lug can be supplied as bare copper, tinned copper, aluminum or bimetallic type depending on conductor material and environment.

A cable lug 95mm2 is suitable for heavier power applications. It is often used in large electrical panels, power distribution equipment, transformers and industrial machines. When ordering a 95mm² lug, buyers should confirm barrel dimensions, palm width and hole size. For example, some applications may require M10 or M12 mounting holes.

These medium sizes are also commonly used in custom copper cable lugs, tinned copper cable lugs and compression lugs.

Large Cable Lug Sizes: 120mm2, 150mm2, 185mm2 and 240mm2

Large cable lug sizes are used in higher-current power systems. A cable lug 120mm2 and cable lug 150mm2 are common in power distribution cabinets, transformers, generator systems and industrial equipment.

For three-core cables, buyers may search for 3c x 185mm2 cable lugs. This usually means cable lugs suitable for a 3-core cable with 185mm² conductors. In this case, the correct lug size is based on each conductor size, not the total cable outside diameter. Some buyers may also write cable lugs 185mm, but it is better to confirm whether they mean 185mm² conductor size.

A cable lug 240mm2 is used for high-current electrical systems, large distribution boards, power cabinets and heavy-duty industrial installations. At this size, accurate crimping becomes very important. The barrel wall thickness, copper material, crimping die and hole position should all be checked carefully.

For large cable lugs, poor contact can create serious heat problems. This is why stable material quality and correct crimping performance are important.

Heavy-Duty Cable Lug Sizes: 300mm2, 400mm2, 500mm2 and 630mm2

Heavy-duty cable lugs are used in large power distribution systems, switchgear, substations, transformers, renewable energy systems and industrial equipment.

A cable lug 300mm2 is suitable for large conductors where high current capacity is required. A cable lug 400mm2 is used in even heavier power systems and often requires a wider palm and thicker copper material.

A cable lug 500mm2 and 500mm2 cable lugs are used in demanding high-current systems. These lugs need strong crimping performance and accurate dimensions. Because the cable is large and stiff, the lug design must also support practical installation.

A cable lug 630mm2 is one of the larger sizes used in industrial power systems. It is normally used for large cable termination, heavy-duty switchgear, transformer connections and high-current distribution systems. For this size, custom manufacturing may be needed because different projects may require special barrel length, hole spacing, palm width or plating.

How to Choose the Correct Cable Lug Size

To choose the correct cable lug size, start with the cable conductor cross-section. If the cable is 70mm², choose a 70mm² lug. If the cable is 240mm², choose a 240mm² lug. Do not choose only by looking at the outside diameter of the insulation.

Next, confirm the conductor material. Copper conductors usually use copper cable lugs or tinned copper cable lugs. Aluminum conductors usually use aluminum cable lugs or bimetallic cable lugs when connecting to copper busbars.

Then check the mounting hole size. Common hole sizes include M6, M8, M10, M12 and M16. The same cable lug size can have different hole sizes, so this must be confirmed before ordering.

Also consider the installation environment. For indoor dry environments, bare copper lugs may be enough. For marine, outdoor, battery or humid environments, tinned copper cable lugs are usually a better choice.

Finally, check whether the lug needs to follow a standard such as DIN 46235, DIN 46234, NEMA spacing or customer-specific drawings.

Custom Cable Lug Sizes from Carsai

Carsai manufactures copper cable lugs, tinned copper cable lugs, aluminum cable lugs, bimetallic lugs and compression lugs in many sizes. We can supply standard sizes such as cable lug 16mm2, cable lug 25mm2, cable lug 35mm2, cable lug 50mm2, cable lug 70mm2, cable lug 95mm2, cable lug 120mm2, cable lug 150mm2, cable lug 240mm2, cable lug 300mm2, cable lug 400mm2, cable lug 500mm2 and cable lug 630mm2.

We can also manufacture custom cable lugs based on drawings, samples or special project requirements. Custom options include barrel length, palm width, hole size, hole spacing, copper thickness, bending angle, plating thickness and packing method.

If you need cable lugs for electrical panels, power distribution systems, grounding systems, battery equipment, EV chargers, telecom cabinets or OEM electrical assemblies, we can help you choose the correct size and structure.

FAQ About Cable Lug Sizes

What size cable lug do I need?

You need a cable lug that matches your cable conductor cross-section. For example, use a cable lug 70mm2 for a 70mm² conductor and a cable lug 95mm2 for a 95mm² conductor.

Is cable lug size the same as hole size?

No. Cable lug size usually refers to the conductor size, while hole size refers to the mounting bolt hole, such as M6, M8, M10 or M12.

Can one cable lug size have different hole sizes?

Yes. A cable lug 50mm2 can be made with different hole sizes depending on the installation point. Always confirm both cable size and hole size before ordering.

What are 500mm2 cable lugs used for?

500mm2 cable lugs are used for high-current power systems, large electrical panels, transformers, switchgear and industrial power distribution equipment.

Can cable lug sizes be customized?

Yes. Cable lug sizes, barrel dimensions, palm width, hole size and plating can be customized according to drawings, samples or project requirements.