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  • K4 US Box Fin Bolt & Nut
  • Image 2

US Box Fin Bolt & Nut from K4

USD3.19 (inc Tax) USD2.65 (exc Tax)
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Product Description

The screws are A4 stainless steel, the plates are a brass insert moulded into tough nylon. They are HALF the weight of the existing brass plate ones, which may not sound a lot but is a 20g saving in a quad. Add this to a set of K4 quad fins and there’s a saving of 0.2kg over a standard G10 set up – not insubstantial for the fins alone!

Strength-wise these are more than sufficient. A vice/lump hammer test showed the first failure was to shear the lugs off the back of the fin(!). Eventually with a good swing of the hammer the plate shattered destroying the brass insert along with it, but this was at a far greater load than you’d want to subject your board to even if you were hitting rocks.

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