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3/8 in. Dia. x 3-1/2 in. L Bolt with Large Flat Washer Kit for Dock Float Drum Installation (12-Pack)

  • Manufactured to preserve frame edges and float flanges
  • Large washer features a 7/16 in. hole to fit 3/8 in. bolt
  • Small washer helps keep the dock bottom lip protected
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How to Get It

Frequently Bought Together


Product Overview

Make sure to have the right fasteners for your aluminum dock when installing the floats. These bolt kits are designed to protect the edges of the aluminum frame and the polyethylene flange of the floats. The 1.75 in. large flat washer has 7/16 in. hole to fit perfectly on the 3/8 in. hexagonal bolt.
  • Super-sized flat washer will protect the flange of the float from the lock washer and spread the stress of the bolt on a larger surface, protecting the float's integrity
  • Smaller washer will prevent the aluminum dock bottom lip from being crushed by the bolt's head
  • Lock washers and nut will secure the whole assembly
  • Get the right combination without having to mixed flat washers with different hole sizes to achieve a stable attachment



Product Depth (in.)
1.75 in
Product Height (in.)
3.5 in
Product Length (in.)
1.75 in
Product Width (in.)
1.75 in


Dock Hardware Type
Duty Rating
Marine Supplies Product Type
Other Marine Hardware
Galvanized Steel
Product Weight (lb.)
0.15 lb

Warranty / Certifications

Manufacturer Warranty
1 year

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Customer Reviews

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    out of 1 reviews
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This bolt/washer combo pack for attaching multinautic floats to a...
This bolt/washer combo pack for attaching multinautic floats to a floating aluminum dock. Combo pack included all parts for 12 attachment points. Not cheap, but worked well with the doc and floats.
Response from MultinauticApr 6, 2021
Hi, we are happy to see that you loved our hardware. Thank you very much for the good review. multionline
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Showing 1-1 of 1 reviews