316 Open-Base Bollard Boat Marine Dock Bollard Cleat with Square Holes (commonly referred to as a four-hole carriage-bolt open-base dock/boat cleat).
Key Features & Design Architecture
Square Mounting Holes: The defining feature is the square shape of the four fastener holes. These are specifically engineered to accept carriage bolts (also known as coach bolts). The square neck under the smooth head of a carriage bolt drops into these slots, locking the bolt firmly in place and preventing it from spinning when you tighten the nuts from beneath the deck.
Open-Base Cavity: The high arched space between the center pillars allows you to pass looped dock lines or bowline eyes directly through the center of the cleat before wrapping them over the wings. This provides more versatile and secure line-routing methods compared to a solid-base setup.
Four-Hole Footprint: By spreading the anchoring load over four distinct fastening points rather than two, this cleat provides maximum resistance against high-impact shear and pulling forces from wind and tides.
Marine-Grade Material: Precision-cast from solid 316 stainless steel and highly polished to a mirror finish. Its smooth, rounded edges eliminate sharp friction points to safeguard your mooring ropes from chafing.
To help you get the exact specifications for your project, please let us know:
What overall length (typically available from 6", 8", 10", up to 12") do you need to handle your rope diameter?
Are you matching specific center-to-center hole spacing to reuse existing drill patterns on your deck or dock?
Do you need assistance determining the correct carriage bolt size and thread pitch for installation?
Haifan Rigging supply a range of marine boat hardwares. They come with a variety of fittings for each end to suit your particular application. Yachts, Sailboats, Ships and Other Fields.
If you wish to ask a question or need further advice, you are welcome to contact us. We'll be happy to help.
We look forward to hearing from you!
