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Structural steel bonding clamps

Hello All,

I am working on a kitchen extension which has 3 Universal Beams bolted together which sit on block-work. There is no direct connection to earth. However when tested it has a path to MET of 2kOhm.

As a result I plan to bond this steelwork.

The design of the room means these beams will be exposed. Getting a Furse1 style clamp on the beam will be pretty clunky. One of the bolted connections will be hidden so I am currently planning on getting a Earth Tag onto the end of the M22 bolt.
Is there any product that isn't an M25 or M20 style earth tag available? Or is my plan to use a 25mm SWA earth tag sandwiched between two M22 washers a reasonable solution?
I could perhaps get a BS951 clamp on the thread of the bolt but the surface area of the thread might not be a great contact.

I'm not too keen to drill a hole in the steel for a smaller connection.

The structural steel is also getting a thick coating of a Fire Retardant paint inline with Part B.

Any...

Structural steel bonding clamps

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