Fasteners & Mounting
Marine Hardware & Installation
Marine Fasteners, Mounting Hardware & Installation Supplies
Shop marine-grade screws, bolts, nuts, washers, brackets, backing plates, rivets, mounting pads, sealants, thread lockers, and anti-seize for secure hardware installations in saltwater environments.
Install Check
Shop Backing Plates
Match metal grade, fastener size, thread type, backing support, bedding compound, and load direction before drilling into the boat.
Use marine-grade hardware and proper sealing practices. Confirm load ratings, material compatibility, corrosion risk, deck core protection, and manufacturer instructions before installation.
Popular Fastener & Mounting Searches
Stainless ScrewsWood, sheet metal, and self-tapping screws Bolts & Machine ScrewsHex, carriage, socket, and machine hardware Nuts & WashersFlat, lock, fender, and nylon-insert options Mounting BracketsElectronics, antennas, lights, and accessories Backing PlatesLoad spreading for cleats and deck hardware Rivets & Blind FastenersOne-sided fastening and repair work SealantsWatertight bedding and deck penetrations Thread LockersVibration resistance for threaded hardware Anti-SeizePrevent galling on stainless threads
Fitment
Choose the Right Metal, Size, and Support
Marine fasteners need to match the job. Consider stainless grade, length, diameter, head style, thread type, washer size, backing plate needs, and whether the hardware is loaded in pull, shear, or vibration.
Corrosion
Saltwater Hardware Needs Material Discipline
316 stainless is commonly preferred for saltwater exposure, while 304 stainless may suit freshwater or less demanding areas. Isolate dissimilar metals where needed and use anti-seize on stainless threads to reduce galling.
If a fastener is structural or safety-critical, confirm the correct grade, torque, backing, and installation method.
Stainless Fasteners
Screws, bolts, nuts, washers, threaded rod, lock nuts, and specialty head styles for marine repair and upgrades.
Mounting Hardware
Brackets, bases, pads, backing plates, antenna mounts, rod holder mounts, and accessory supports.
Bedding & Bonding
Sealants, adhesives, thread lockers, anti-seize, and bedding compounds help hardware stay secure and watertight.
Install Notes
Seal Holes and Spread Loads
Fastener selection is only part of the job. Hardware installed through decks, cabins, rails, transoms, or cored panels needs the right pilot hole, sealant, backing, washer, and torque.
Pilot holesUse the correct drill size for the fastener, substrate, and thread engagement.
Bedding compoundSeal penetrations to keep water out of cores, cabins, lockers, and electronics areas.
Backing platesSpread loads for cleats, davits, ladders, rails, seats, and high-load deck hardware.
Thread careUse thread locker or anti-seize where appropriate, especially on stainless-to-stainless threads.
Inspection
Replace Corroded, Loose, or Mismatched Hardware
Check for rust streaks, loose brackets, elongated holes, cracked sealant, missing washers, galvanic corrosion, stripped threads, and water intrusion around mounted hardware.
Projects
Good Hardware Makes Upgrades Last
Electronics, antennas, cleats, rod holders, seats, speakers, lights, ladders, hatches, and deck fittings all rely on correctly chosen mounting hardware.
For heavy or safety-related gear, do a dry fit, mark hole locations carefully, and confirm access to the backside before drilling.
FAQ
Marine Fastener Questions
Should I use 304 or 316 stainless fasteners on a boat?
316 stainless is usually preferred for saltwater and exposed marine use because it has stronger corrosion resistance. 304 stainless can be suitable for freshwater or less exposed applications.
Why do stainless fasteners seize or gall?
Stainless threads can gall when tightened under friction, especially stainless-on-stainless. Anti-seize, correct thread engagement, and careful tightening can help reduce the risk.
When do I need a backing plate?
Use backing plates when hardware carries significant load, such as cleats, rails, ladders, davits, seats, and deck fittings. Backing plates spread load and help prevent crushing or pull-through.
Should deck fasteners be sealed?
Yes. Holes through decks, cabins, and cored panels should be sealed with the correct marine bedding compound to help prevent leaks and core damage.
Ready for a Stronger Install?
Shop Marine Fasteners, Brackets, Backing Plates & Sealants
Search by fastener type, material, size, head style, mounting application, sealant need, bracket type, or installation project.
Mercury MerCruiser Keyed Washer 18323
Original price
$37.34
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Original price
$37.34
Original price
$37.34
$37.34
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$37.34
Current price
$37.34
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Mercury MerCruiser Quicksilver 18323 is a genuine keyed tab washer used in selected Mercury and MerCruiser assemblies where a keyed locking washer ...
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Original price
$37.34
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Original price
$37.34
Original price
$37.34
$37.34
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$37.34
Current price
$37.34
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Crusader Lock Washer 3/8" Zinc Plated - OEM Part RS2180
Original price
$0.21
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Original price
$0.21
Original price
$0.21
$0.21
$0.21
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$0.21
Current price
$0.21
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Genuine Crusader 3/8" lock washer with zinc plating engineered to OEM specifications for secure fastener retention in marine engine and drive appli...
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Original price
$0.21
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Original price
$0.21
Original price
$0.21
$0.21
$0.21
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$0.21
Current price
$0.21
Sold out