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.
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
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.
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.
Filters
Stainless Fender Washer 5/16", .078" Thick, OD 1-1/2
A durable 18-8 stainless steel fender washer sized for 5/16" hardware. Designed to spread load and help protect mounting surfaces. Key Features 18...
View full detailsFlat Washer, 5/16", .062" Thick, OD 9/16" (A/N Style)
Flat Washer (A/N Style) designed for 5/16 in. hardware. Built from 18-8 stainless steel for corrosion resistance in marine and general hardware app...
View full detailsStainless Fender Washer 1/4", .062" Thick, OD 1-1/2
Stainless fender washer sized for 1/4" hardware, built with 18-8 stainless steel for corrosion resistance. Designed with a larger outside diameter ...
View full detailsStainless Fender Washer 1/4", .062" Thick1/4", OD1-1/4"
A marine-grade stainless fender washer designed to spread load and help protect mounting surfaces. Built for corrosion resistance, it’s sized for 1...
View full detailsFlat Washer, 1/4", .050" Thick, OD 1/2" (A/N Style)
Use this 1/4" flat washer to help distribute clamping load and protect mating surfaces. Built for marine-style hardware applications with a corrosi...
View full detailsSquare Tapping Screw - Flat Head,#12 x 2"
Square tapping screw for marine hardware installations, sized #12 x 2" with a flat head and a square drive. Key Features Square-drive tapping scre...
View full detailsStainless Fender Washer 3/8", .078" Thick, OD 1-1/2"
Replace and reinforce threaded connections with this 3/8" stainless steel fender washer. Its larger outside diameter (OD) helps spread load for a m...
View full detailsStainless Fender Washer #10, .062" Thick, OD 1"
Stainless Fender Washer #10 (.062" thick, OD 1") is an 18-8 stainless steel fender washer made to spread load and help protect surfaces in marine h...
View full detailsStainless Fender Washer 1/4", .062" Thick ,OD 1"
Secure panels and covers with this 1/4" stainless steel fender washer. Featuring an 18-8 stainless construction, a .062" thickness, and a 1" outsid...
View full detailsSeachoice 18-8 Stainless Steel Wing Nuts, 5/16-18 Size, Pack of 50
Seachoice 18-8 stainless steel wing nuts (5/16-18) are designed for quick, tool-free tightening using the built-in “wings.” This pack includes 50 w...
View full detailsSeachoice 18-8 Stainless Steel Wing Nuts, 1/4-20 Size, Pack of 100
Seachoice 18-8 stainless steel wing nuts (manufacturer part number 50-01106) are built for secure, finger-tight fastening—ideal when frequent adjus...
View full detailsPhillips Tapping Screw - Truss Head #8 x 1"
Reliable Phillips tapping screws for marine and general hardware applications—built with 18-8 stainless steel and a truss head design for secure fa...
View full detailsPhillips Tapping Screw - Truss Head #8 x 3/4"
Phillips tapping screw with a truss head design for fastening marine and general hardware applications. Size: #8 x 3/4". Key Features Phillips dri...
View full detailsSquare Tapping Screw - Flat Head,#10 x 2"
Square tapping screw with a flat head design in 18-8 stainless steel for corrosion-resistant fastening in marine and general hardware applications....
View full detailsSquare Tapping Screw - Flat Head,#10 x 1-1/2"
A Seachoice square-drive tapping screw in #10 x 1-1/2" size, built for corrosion resistance with 18-8 stainless steel. Key Features Square drive d...
View full detailsFlat Washer, 3/4", .109" Thick, OD 1-7/8"
A corrosion-resistant flat washer sized for 3/4" hardware applications, made from 18-8 stainless steel. Key Features Flat washer design for distri...
View full detailsStainless Cotter Pin
Seachoice Stainless Cotter Pin (18-8 stainless steel) for reliable securing and anti-rattle retention in marine hardware applications. Key Features...
View full detailsPhillips Tapping Screw - Truss Head #8 x 1/2"
Secure a clean, reliable fastening with this Phillips tapping screw featuring a truss head design and 18-8 stainless steel corrosion resistance. Ke...
View full detailsStainless Fender Washer #10, .050" Thick, OD 3/4"
Stainless Steel #10 fender washer made for spreading load and providing a larger bearing surface. This Seachoice/LNS washer measures .050" thick wi...
View full detailsPhillips Tapping Screw - Pan Head, #14 x 3"
Phillips tapping screw with a pan head for secure fastening in sheet metal and other applications that benefit from a self-tapping style screw. Key...
View full detailsStainless Cotter Pin 5/32" x 2"
Secure and lock assemblies with this Stainless Cotter Pin, sized 5/32" x 2". Made from 18-8 stainless steel for dependable corrosion resistance in ...
View full detailsFlat Washer, 1/2", .078" Thick, OD 1-1/4"
A marine-ready flat washer made from 18-8 stainless steel, sized for a 1/2" fastener with a .078" thickness and 1-1/4" outside diameter. Key Featur...
View full detailsStainless Fender Washer #8, .050" Thick, OD 3/4"
A corrosion-resistant stainless steel fender washer designed to spread load and help protect mounting surfaces when securing hardware. Key Features...
View full detailsStainless Cotter Pin 5/32" x 1-1/4"
Secure pins, linkages, and hardware with this stainless cotter pin sized for reliable retention. Key Features Stainless construction helps resist ...
View full detailsSquare Tapping Screw - Flat Head,#10 x 1-1/4"
Square Tapping Screw with a flat head design in #10 x 1-1/4" length, made from 18-8 stainless steel for reliable corrosion resistance on marine and...
View full detailsStainless Fender Washer #6, .050" Thick, OD 3/4"
Stainless Fender Washer #6 is an 18-8 stainless steel flat fender washer designed to spread load and help secure hardware connections. Key Features...
View full detailsNylon Flat Washer 3/8", 0.62" Thick, OD 1"
Use this nylon flat washer to help distribute load and improve surface contact for fasteners in marine and general hardware applications. Key Featu...
View full detailsNylon Flat Washer 1/4", 0.56" Thick, OD 11/16"
SeaChoice Nylon Flat Washer (SKU 50-01029) is a non-metallic flat washer designed to spread load and help protect mating surfaces when used with 1/...
View full detailsNylon Flat Washer 5/16", 0.62" Thick, OD 7/8"
A marine-grade nylon flat washer sized for 5/16" hardware. Helps create a smooth bearing surface under bolt heads and spreads the load over a wider...
View full detailsFlat Washer, 5/8", .078" Thick, OD 1-1/2"
Add corrosion-resistant strength to your assembly with this Seachoice 18-8 stainless flat washer. Key Features Flat washer design helps distribute...
View full detailsNylon Flat Washer 1/2", 0.62" Thick, OD 1-1/4"
Nylon Flat Washer (Seachoice) sized for 1/2" hardware. Designed to spread load and help protect mounting surfaces while insulating fasteners in man...
View full detailsPhillips Tapping Screw - Pan Head, #14 x 2"
Phillips tapping screw with a pan head in #14 x 2" size, made from 18-8 stainless steel for corrosion-resistant fastening. Key Features Pan head f...
View full detailsPhillips Tapping Screw - Pan Head, #14 x 1-1/4"
Secure marine and general-purpose fastening with this Phillips tapping screw designed for dependable thread-forming hold. Features a pan head and P...
View full detailsStainless Cotter Pin 5/32" x 1-1/2"
Secure clevis pins, shafts, and other split-pin applications with this stainless cotter pin—designed for corrosion resistance in marine and outdoor...
View full detailsPhillips Tapping Screw - Pan Head, #14 x 1-1/2"
Secure marine and general fastening jobs with this Seachoice Phillips tapping screw in 18-8 stainless steel. The #14 x 1-1/2" pan head design is ma...
View full detailsFlat Washer, 3/8", .062" Thick, OD 1"
A flat washer made for reliable fastening with a 3/8" screw size, .062" thickness, and 1" outside diameter—made from 18-8 stainless steel for stron...
View full detailsFlat Washer, 7/16", .062" Thick, OD 1-1/8"
Durable 7/16" flat washer for marine and general fastening applications. Made from 18-8 stainless steel for corrosion resistance, with .062" thickn...
View full detailsSquare Tapping Screw - Flat Head,#8 x 1-1/2"
Square tapping screw with a flat head in #8 x 1-1/2" size, made from 18-8 stainless steel for corrosion resistance in marine and outdoor environmen...
View full detailsStainless Cotter Pin 1/8" x 1-1/2"
Secure cotter-style pin connection for marine fasteners and hardware applications. This SeaChoice stainless cotter pin is made from 18-8 stainless ...
View full detailsFlat Washer, 5/16", .062" Thick, OD 7/8"
Keep fasteners seated securely with this Seachoice flat washer made from 18-8 stainless steel. Designed to spread load and help reduce loosening fo...
View full detailsPhillips Tapping Screw - Pan Head, #14 x 1"
A Phillips pan head tapping screw sized #14 x 1" for marine and general hardware fastening needs. Key Features Phillips pan head tapping screw Siz...
View full detailsSquare Tapping Screw - Flat Head,#8 x 1-1/4"
18-8 stainless steel square tapping screw with a flat head for fastening marine hardware and other sheet-metal/trim applications. Key Features Squ...
View full detailsStainless Cotter Pin 1/8" x 1"
Secure split pins quickly in place with this stainless cotter pin sized for 1/8" holes. Built from 18-8 stainless steel for corrosion resistance in...
View full detailsStainless Cotter Pin 1/8" x 2"
A stainless cotter pin for secure, reliable fastening—ideal for locking clevis pins and other split-pin applications in marine and outdoor hardware...
View full detailsStainless Cotter Pin 1/8" x 1-1/4"
Keep hardware secured with this Seachoice stainless cotter pin sized 1/8" x 1-1/4". Made from 18-8 stainless steel for reliable corrosion resistanc...
View full detailsStainless Cotter Pin 3/32" x 1-1/2"
Secure and lock castled nuts and other clevis-style connections with this stainless cotter pin. Built from 18-8 stainless steel for dependable corr...
View full detailsNylon Flat Washer #10, 0.32" Thick, OD 7/16"
A durable #10 nylon flat washer designed to spread load and help protect fasteners and mating surfaces in marine and other lightweight applications...
View full detailsFlat Washer, 1/4", .050" Thick, OD 11/16"
SeaChoice flat washer designed for hardware mounting applications where you need a 1/4" bolt size with a .050" thickness and 11/16" outer diameter ...
View full details