Bahco Chain Strap Wrench - 370-4

The Bahco 370-4 Chain Strap Wrench provides high strength and a positive grip, ideal for tightenin...

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OnBuy.comBahco 370-4 Chain Strap Wrench 300Mm (12In)
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£51.24
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B&QB&Q - 370-4 Chain Strap Wrench 300mm (12In) Multi Colour (One Size)
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Product Information

Full details

The Bahco 370-4 Chain Strap Wrench is designed for professional plumbers and mechanics who need a reliable, heavy-duty solution for turning large-diameter pipes, valves, and fittings in confined spaces. Its standout feature is the unique dual-directional jaw design, which allows for efficient tightening and loosening without removing the chain. While it offers superior grip and durability, users should be aware that the aggressive serrated jaws may leave surface markings on softer materials like polished chrome or plastic piping.

All features

Model Part Number370-4
BrandBahco

Extended Product Information

FAQs

What is the maximum capacity of the 370-4 wrench?

The maximum capacity is 110mm, or approximately 4 1/4 inches.

Can this wrench be used on chrome-plated pipes?

It is not recommended, as the induction-hardened serrated jaws will likely scratch or mar the chrome finish.

Does the chain need to be removed to change direction?

No, the dual-directional jaw design allows you to operate in either direction without detaching the chain.

How long is the tool handle?

The overall length of the tool is 300mm (12 inches).

What is the weight of the wrench?

The tool weighs approximately 780g.

Troubleshooting

Chain slipping on the pipe surface

Ensure the teeth are firmly seated against the material and that you are pulling in the correct direction relative to the jaw orientation.

Jaw becomes stuck or stiff

Clean any grime or pipe sealant from the jaw area and apply a small amount of penetrating oil to the pivot point.

Pros and Cons

Pros

  • Excellent grip on large-diameter smooth surfaces
  • Dual-direction operation saves significant time
  • Durable construction with high-strength materials
  • Ideal for narrow workspaces where reach is limited

Cons

  • Aggressive serrations can damage delicate pipe finishes
  • Requires manual adjustment of the chain which can be time-consuming
  • Not suitable for extremely tight clearances requiring low-profile tools

Setup, Compatibility & Care

To use the wrench, loop the chain around the pipe, engage the hook into the desired slot on the head, and ensure the teeth are pressed firmly against the pipe surface before applying force. This tool is compatible with most standard steel, iron, and PVC pipes within its 110mm capacity. For maintenance, keep the chain links clean and free of debris to ensure smooth engagement with the locking mechanism. Periodically apply a light machine oil to the pivot point and the locking jaw to prevent corrosion and ensure the teeth remain sharp and effective.

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