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.
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Sea-Dog 0804881 Eye Bolt w/Shoulder, 5/8" I.D.
Corrosion resistant machined 304 stainless steel w/metric threads.Designed to take inline loads, shouldered eyebolts can handle limited side loadin...
View full detailsSea-Dog 0812801 Pad Eye, 1 pr.
Polished cast brass pad eye can be used for a variety of applications both decorative and functional. Great for block attachment, controlling lead ...
View full detailsSea-Dog 0804831 Eye Bolt w/Shoulder, 9/16" I.D.
Corrosion resistant machined 304 stainless steel w/metric threads.Designed to take inline loads, shouldered eyebolts can handle limited side loadin...
View full detailsSea-Dog 0804661 Eye Bolt w/Shoulder, 1/2" I.D.
Corrosion resistant machined 304 stainless steel w/metric threads.Designed to take inline loads, shouldered eyebolts can handle limited side loadin...
View full detailsSea-Dog 081270 Pad Eye Bronze 5/16"
Forged bronze wire.
Seachoice Replacement Hatch Handle – Clear
Seachoice Replacement Hatch Handle – ClearKeep your deck hatches fully functional with this direct-fit replacement handle from Seachoice. Designed ...
View full detailsSea-Dog 0812701 Pad Eye 5/16" Bronze, 1 pr.
Forged bronze wire.
Seachoice Non-Locking Replacement Gas Fill Cap (50-32501)
The Seachoice 50-32501 Replacement Gas Fill Cap is a direct-fit non-locking cap for deck mount fuel fill plates. Made from durable black plastic th...
View full detailsSeachoice Cast Stainless Steel Locking Gas Fill Cap with Key & Tether (50-32551)
The Seachoice 50-32551 Replacement Gas Fill Cap is a cast stainless steel locking cap designed for Seachoice 32251, 32261, 32271, and 32281 series ...
View full detailsSea-Dog 0804631 Eye Bolt w/Shoulder, 1/2" I.D.
Corrosion resistant machined 304 stainless steel w/metric threads.Designed to take inline loads, shouldered eyebolts can handle limited side loadin...
View full detailsBeckson 6" Replacement O-Ring for Screw-Out Deck Plate
Beckson 6" Replacement O-Ring for Screw-Out Deck PlateKeep your Beckson 6" screw-out deck plate watertight with this direct-fit replacement O-ring....
View full detailsPerko Water Deck Fill Cap – Black
Perko Water Deck Fill Cap – BlackA replacement cap for Perko water deck fill fittings, keeping your freshwater fill port sealed and protected when ...
View full detailsPCM Engine Shim Plate | 98124
PCM Engine Shim Plate | 98124Precision matters when it comes to engine alignment. This OEM-specification shim plate is used in PCM inboard engine a...
View full detailsPCM Marine Engine Nut 7/16 -20| RS1028
PCM Marine Engine Nut – RS1028A genuine PCM engine nut for inboard marine engine assemblies. Small fasteners like this are the kind of part that st...
View full detailsSeachoice 01975 Fastener Restock Bundle
Seachoice 01975 Fastener Restock Bundle is a ready-to-use mix of common stainless and nylon-insert fasteners and washers—built for quick marine har...
View full detailsEye Nut Stainless 1/2"-13
Sea-Dog Line stainless eye nut for marine lifting and securement applications—built from investment-cast 316 stainless steel for corrosion resistan...
View full detailsEye Nuts Stainless 5/16"-18
Built for securement and lifting use, these Sea-Dog Line eye nuts are made from investment cast 316 stainless steel to resist corrosion in marine e...
View full detailsEye Nut Stainless 1/2"-13
LNS Sea-Dog Line eye nut for lifting or securement points—made for corrosion resistance with investment cast 316 stainless steel. The 1/2"-13 threa...
View full detailsCap Screw - Hex Head, 1/2"-13 x 7"
Secure components with this 1/2"-13 x 7" hex head cap screw made from 18-8 stainless steel. The hex head design makes it easy to tighten using the ...
View full detailsEye Nuts Stainless 1/4"-20
For use as a lifting or securement point these eye nuts are constructed of investment cast marine grade 316 stainless steel for maximum corrosion r...
View full detailsCap Screw - Hex Head, 1/2"-13 x 10"
A hex head cap screw in 18-8 stainless steel, sized for 1/2"-13 coarse thread and 10" length—ideal for durable, corrosion-resistant fastening in ma...
View full detailsEye Nut Stainless 3/8"-16
Sea-Dog Line Eye Nut Stainless 3/8"-16 (SKU 354-0781101) is an investment-cast marine-grade 316 stainless eye nut made for reliable lifting and sec...
View full detailsLag Screw, 3/8 x 5"
Hot Dipped Galvanized.
Phillips Machine Screw - Oval Head, 5/16"-18 x 5"
A corrosion-resistant Phillips oval head machine screw in 18-8 stainless steel—sized 5/16"-18 x 5" for marine hardware fastening needs. Key Feature...
View full detailsEye Nut Stainless 3/8"-16
For use as a lifting or securement point these eye nuts are constructed of investment cast marine grade 316 stainless steel for maximum corrosion r...
View full detailsLag Screw, 3/8 x 4"
Secure marine and outdoor components with this Seachoice lag screw—3/8" diameter x 4" length, hot dipped galvanized for corrosion resistance. Key F...
View full detailsSteel Driver Bits #2
Keep a reliable Phillips #2 bit on hand for frequent screw-driving jobs. This steel driver bit is 2" long with a 1/4" hex drive for secure fit in c...
View full detailsCap Screw - Hex Head, 1/2"-13 x 8"
A durable hex head cap screw sized for marine and general hardware applications—made from 18-8 stainless steel for corrosion resistance. Key Featur...
View full detailsEye Nuts Stainless 1/4"-20
Sea-Dog Line stainless eye nuts are built to create a strong lifting or securement point—made from investment-cast 316 stainless steel for excellen...
View full detailsHex Nut M12-1.75
A dependable marine fastener for fastening applications: this hex nut is sized M12-1.75 and made from 18-8 stainless steel for corrosion resistance...
View full detailsStainless Fender Washer 1/2", .109" Thick, OD 2
Stainless Fender Washer for marine and hardware applications—18-8 stainless steel construction with a 1/2" size, .109" thickness, and 2" OD for bro...
View full detailsSeachoice 00673 3/8"-16 x 3' Threaded Rod - Stainless
A Seachoice 00673 stainless threaded rod sized for 3/8"-16 (right-hand) threads and cut to 3' length—ideal for fabricating and replacing marine har...
View full detailsSteel Driver Bits #3
Finish drive hardware tasks with this Seachoice/ LNS steel driver bit made for precision fastening. Key Features #3 size steel driver bit 2" long ...
View full detailsSeachoice 00674 1/2"-13 x 3' Threaded Rod - Stainless
SeaChoice 00674 threaded rod is made from 18-8 stainless steel for corrosion-resistant marine hardware applications. This 1/2"-13 size is supplied ...
View full detailsNylon Flat Washer 5/8", 0.62" Thick, OD 1-1/4"
Use this nylon flat washer to help spread load and protect mating surfaces on marine and other hardware applications. It’s sized for 5/8" hardware ...
View full detailsLock Washer, 5/8"
Secure fastening with a corrosion-resistant lock washer designed for 5/8" threaded applications. Made from 18-8 stainless steel for reliable perfor...
View full detailsPhillips Machine Screw - Pan Head. 3/8"-16 x 2"
SeaChoice Phillips pan head machine screw in 18-8 stainless steel (3/8"-16 x 2"). Key Features Phillips drive for straightforward installation wit...
View full detailsPhillips Machine Screw - Pan Head. 5/16"-18 x 1"
Replace or add Phillips pan head machine screws for marine and general fastening jobs using this 5/16"-18 x 1" stainless option. Key Features Phil...
View full detailsPhillips Machine Screw - Pan Head. 1/4"-20 x 2-1/2"
This Seachoice Phillips machine screw features a pan head profile and measures 1/4"-20 x 2-1/2", made from 18-8 stainless steel for corrosion-resis...
View full detailsTee Nut - Stainless 1/4"-20
Use this stainless tee nut to create a durable 1/4"-20 threaded connection in marine-grade installations where you need a secure, corrosion-resista...
View full detailsCarriage Bolt, 1/2"-13 x 5"
A heavy-duty carriage bolt sized for through-bolting applications—1/2"-13 x 5" with a hot-dipped galvanized finish for corrosion resistance. Key Fe...
View full detailsNylon Insert Locknut - Stainless 5/16-24
Nylon insert locknut in stainless steel for secure, vibration-resistant fastening on 5/16-24 threaded hardware. The nylon insert helps resist loose...
View full detailsSeachoice 00671 5/16"-18 x 3' Threaded Rod - Stainless
Seachoice threaded rod in 18-8 stainless steel for secure, corrosion-resistant marine-style fastening applications. Key Features Seachoice threade...
View full detailsSeachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 10-24 X 1/2 In., Pack of 25
Seachoice Phillips barrel nuts with a truss head are an 18-8 stainless steel fastening solution designed to help resist corrosion in marine environ...
View full detailsCarriage Bolt, 1/2"-13 x 4"
Carriage Bolt, 1/2"-13 x 4" — Hot Dipped Galvanized hardware for secure, long-lasting fastening in marine and general exterior applications. Key Fe...
View full detailsCarriage Bolt, 1/2"-13 x 3"
A hot-dipped galvanized carriage bolt sized for 1/2"-13 coarse thread and 3" length applications where a square neck helps prevent bolt rotation du...
View full detailsFlat Washer, 3/8", .062" Thick, OD 1"
A hot-dipped galvanized flat washer for broad fastening and mounting applications where corrosion resistance matters. Size: 3/8" inside diameter wi...
View full detailsLag Screw, 3/8 x 3"
A heavy-duty lag screw for marine and exterior fastening jobs where corrosion-resistant hardware is needed. Key Features Size: 3/8" x 3" Material/...
View full details