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Deck hardware

Bimini Top Hardware: Parts, Sizes and How to Install Them

A bimini lasts for years if its hardware is 316 stainless and sized correctly. We go through the frame parts, how to measure the tubing and what to check before repairing or fitting a new top.

By The BarcoEquipado Team Updated on 5 min read

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Stock checked on October 6, 2026
Top rated8 Pcs Stainless Steel 3/8" Pad Eye Straps for Bimini Boat Top…
8 Pcs Stainless Steel 3/8" Pad Eye Straps for Bimini Boat Top… 9.0 BarcoEquipado score: 9.0 out of 10 See price
Best sellerThorn 1/4" Bimini Top Quick Release Pins with Lanyard,4 Pack…
Thorn 1/4" Bimini Top Quick Release Pins with Lanyard,4 Pack… 9.0 BarcoEquipado score: 9.0 out of 10 See price
Best valueTaylor Made Products 11736 Bimini Marine Hinge Thumb Screw
Taylor Made Products 11736 Bimini Marine Hinge Thumb Screw 8.7 BarcoEquipado score: 8.7 out of 10 See price

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The parts of a bimini frame

A bimini is a tube frame with a tensioned fabric top. Almost everything that fails is hardware: a jaw slide that works loose, a lost pin or a corroded hinge. Knowing the parts helps you order the right one, and the products above change with stock, so check the tubing size and material.

PartFunctionWhat to check
Jaw slideJoins two tubes and lets you fold or adjust the bowTube diameter and locking screw
Eye endCaps the tube end and gives a fastening pointEye with enough thickness
Deck hingeSecures the frame to the deck and lets it fold downBase and pivot angle
Rail mountAttaches the frame to a rail or stanchionRail tube diameter
Quick-release pinRemoves the top without toolsPin thickness and length
Straps and bracingTension the top and stop it flappingStainless buckle and quality webbing

How to measure the tubing and choose the size

Bimini frames are almost always made of 7/8 in (22 mm), 1 in (25 mm) or 1 1/4 in (32 mm) tubing. To get it right:

  1. Measure the outside diameter with calipers, or wrap a tape around the tube and divide by 3.14.
  2. Check the wall thickness too: thin-wall tubing needs fittings with a bushing.
  3. Don't mix metric and imperial: 22 mm tube and a 7/8 in (22.2 mm) fitting match, but 25 mm tube will not fit a 7/8 in fitting.
  4. With the frame assembled, confirm the tubes overlap enough in the jaw slide: at least twice the diameter.

If you're replacing the whole frame or fabric, first look at the best bimini tops and the guide on how to measure a bimini.

Materials: 316 stainless or aluminum

Bimini hardware takes sun, salt water and constant vibration. So:

  • 316 (A4) stainless: the best choice for load-bearing parts such as hinges, pins and fasteners. Type 304 works below deck but rusts outdoors (304 vs 316 stainless).
  • Anodized aluminum: light, no iron rust, common in tubing and large fittings. Don't let it touch stainless without an isolator, or you'll get galvanic corrosion.
  • Nylon and UV-stabilized engineering plastic: in end caps, bushings and guides. They degrade in sunlight, so replace them when you see cracks.

Warning: use fasteners of the same material as the part and, between aluminum and stainless, a nylon washer or anti-seize paste. This is the cause of most screws seized to the tube.

Installation and deck mounting

  1. Hold the assembled frame on the deck and mark each base position with the boat at rest and the tubes squared up.
  2. Check what is under each hole: backing, core or void. Bimini hardware takes strong side loads in wind.
  3. Fasten with A4 through-bolts, a backing plate and wide washers. Avoid self-tapping screws in unreinforced laminate.
  4. Seal the holes with butyl or polyurethane (marine sealants) so water can't get into the core.
  5. Fit the top, tension the straps and check that every point shares the load.

Tip: carry spare base caps and quick-release pins aboard. They're the parts that disappear when the top is folded in a hurry.

Maintenance and common mistakes

Before each season, check fasteners and jaw slides, lubricate moving parts with a marine lubricant and rinse the tubing with fresh water. If you take the top down for winter, store it in its cover (boat covers) and not folded damp.

  • Buying a jaw slide without measuring the tube diameter.
  • Mixing plain steel fasteners with stainless parts.
  • Overtightening the clamp until the tube deforms: lock it without crushing.
  • Mounting to unreinforced laminate without a backing plate.
  • Leaving the bimini up in a storm: tops aren't designed for strong winds, and the hardware is the first thing to give.

For other small pieces of hardware, see also stainless hinges and latches.

Frequently asked questions

What tube size is a bimini frame?+

Usually 7/8 in (22 mm), 1 in (25 mm) or 1 1/4 in (32 mm) tubing. Measure the outside diameter with calipers before buying jaw slides, eye ends or hinges so they fit without slop.

What is a jaw slide?+

It is the fitting that joins two tubes of the frame and lets you adjust or fold the bow. It loosens with a locking screw. Choose 316 stainless in the same diameter as your tube.

Stainless or aluminum for bimini hardware?+

316 stainless for load-bearing parts such as deck hinges and pins. Anodized aluminum is light and fine for tubing and large fittings, but isolate it from stainless with a nylon washer or anti-seize paste.

How do I mount a bimini to the deck without damaging the laminate?+

Use A4 stainless through-bolts with a backing plate and wide washers, and seal every hole with butyl or polyurethane. On a cored laminate, fill the hole with epoxy to protect the core.

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8 Pcs Stainless Steel 3/8" Pad Eye Straps for Bimini Boat Top…

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