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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.

Shop Fasteners & Mounting Stainless Screws Mounting Brackets
Install Check

Match metal grade, fastener size, thread type, backing support, bedding compound, and load direction before drilling into the boat.

Shop Backing Plates

Use marine-grade hardware and proper sealing practices. Confirm load ratings, material compatibility, corrosion risk, deck core protection, and manufacturer instructions before installation.

Quick ShopFitmentHardware TypesInstall NotesInspectionFAQDeck HardwareTools

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.

316 Stainless 304 Stainless Threaded Rod

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.

SS

Stainless Fasteners

Screws, bolts, nuts, washers, threaded rod, lock nuts, and specialty head styles for marine repair and upgrades.

MNT

Mounting Hardware

Brackets, bases, pads, backing plates, antenna mounts, rod holder mounts, and accessory supports.

BED

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.

Washers Nuts Adhesives

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.

Shop Fasteners & Mounting Backing Plates Sealants

Filters

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Mercury MerCruiser Stud 898101943

$16.85 - $16.85
$16.85
$16.85
$16.85 - $16.85
$16.85
Only 2 left!

OEM Stud for Mercury MerCruiser Marine Engines Genuine Mercury MerCruiser stud provides secure fastening for engine components, ensuring proper ass...

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$16.85 - $16.85
$16.85
$16.85
$16.85 - $16.85
$16.85

PCM Engine Shim Plate | 98124

$0.00 - $0.00
$0.00
$13.78
$13.78 - $13.78
$13.78
Only 1 left!

PCM Engine Shim Plate | 98124Precision matters when it comes to engine alignment. This OEM-specification shim plate is used in PCM inboard engine a...

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$0.00 - $0.00
$0.00
$13.78
$13.78 - $13.78
$13.78

PCM Marine Engine Nut 7/16 -20| RS1028

$0.00 - $0.00
$0.00
$0.64
$0.64 - $0.64
$0.64
in stock

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...

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$0.00 - $0.00
$0.00
$0.64
$0.64 - $0.64
$0.64
Seachoice 01975 Fastener Restock Bundle

Seachoice 01975 Fastener Restock Bundle

$988.53 - $988.53
$988.53
$988.53 - $988.53
$988.53

This bundle comes with the top 25 best-selling fasteners for simple restocking. Includes:Item # Description 00606 1/4"-20 Hex Nut, 18-8 SS 00618 #8...

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$988.53 - $988.53
$988.53
$988.53 - $988.53
$988.53
Eye Nut Stainless 1/2"-13

Eye Nut Stainless 1/2"-13

$13.59 - $13.59
$13.59
$13.59 - $13.59
$13.59

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...

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$13.59 - $13.59
$13.59
$13.59 - $13.59
$13.59
Eye Nuts Stainless 5/16"-18

Eye Nuts Stainless 5/16"-18

$7.49 - $7.49
$7.49
$7.49 - $7.49
$7.49

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...

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$7.49 - $7.49
$7.49
$7.49 - $7.49
$7.49
Eye Nut Stainless 1/2"-13

Eye Nut Stainless 1/2"-13

$16.09 - $16.09
$16.09
$16.09 - $16.09
$16.09

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...

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$16.09 - $16.09
$16.09
$16.09 - $16.09
$16.09
Cap Screw - Hex Head, 1/2"-13 x 7"

Cap Screw - Hex Head, 1/2"-13 x 7"

$21.39 - $21.39
$21.39
$21.39 - $21.39
$21.39

18-8 Stainless Steel.

$21.39 - $21.39
$21.39
$21.39 - $21.39
$21.39
Eye Nuts Stainless 1/4"-20

Eye Nuts Stainless 1/4"-20

$6.19 - $6.19
$6.19
$6.19 - $6.19
$6.19

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...

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$6.19 - $6.19
$6.19
$6.19 - $6.19
$6.19
Cap Screw - Hex Head, 1/2"-13 x 10"

Cap Screw - Hex Head, 1/2"-13 x 10"

$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99

18-8 Stainless Steel.

$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
Eye Nut Stainless 3/8"-16

Eye Nut Stainless 3/8"-16

$9.79 - $9.79
$9.79
$9.79 - $9.79
$9.79

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...

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$9.79 - $9.79
$9.79
$9.79 - $9.79
$9.79
Lag Screw, 3/8 x 5"

Lag Screw, 3/8 x 5"

$51.29 - $51.29
$51.29
$51.29 - $51.29
$51.29

Hot Dipped Galvanized.

$51.29 - $51.29
$51.29
$51.29 - $51.29
$51.29
Phillips Machine Screw - Oval Head, 5/16"-18 x 5"

Phillips Machine Screw - Oval Head, 5/16"-18 x 5"

$37.59 - $37.59
$37.59
$37.59 - $37.59
$37.59

18-8 Stainless Steel.

$37.59 - $37.59
$37.59
$37.59 - $37.59
$37.59
Eye Nut Stainless 3/8"-16

Eye Nut Stainless 3/8"-16

$7.89 - $7.89
$7.89
$7.89 - $7.89
$7.89

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...

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$7.89 - $7.89
$7.89
$7.89 - $7.89
$7.89
Lag Screw, 3/8 x 4"

Lag Screw, 3/8 x 4"

$40.99 - $40.99
$40.99
$40.99 - $40.99
$40.99

Hot Dipped Galvanized.

$40.99 - $40.99
$40.99
$40.99 - $40.99
$40.99
Steel Driver Bits #2

Steel Driver Bits #2

$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69

2" Long, 1/4" Hex Drive

$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69
Cap Screw - Hex Head, 1/2"-13 x 8"

Cap Screw - Hex Head, 1/2"-13 x 8"

$18.39 - $18.39
$18.39
$18.39 - $18.39
$18.39

18-8 Stainless Steel.

$18.39 - $18.39
$18.39
$18.39 - $18.39
$18.39
Eye Nuts Stainless 1/4"-20

Eye Nuts Stainless 1/4"-20

$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69

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...

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$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69
Hex Nut M12-1.75

Hex Nut M12-1.75

$146.29 - $146.29
$146.29
$146.29 - $146.29
$146.29

18-8 Stainless Steel.

$146.29 - $146.29
$146.29
$146.29 - $146.29
$146.29
Stainless Fender Washer 1/2", .109" Thick, OD 2

Stainless Fender Washer 1/2", .109" Thick, OD 2

$101.29 - $101.29
$101.29
$101.29 - $101.29
$101.29

18-8 Stainless Steel.

$101.29 - $101.29
$101.29
$101.29 - $101.29
$101.29
Seachoice 00673 3/8"-16 x 3' Threaded Rod - Stainless

Seachoice 00673 3/8"-16 x 3' Threaded Rod - Stainless

$28.89 - $28.89
$28.89
$28.89 - $28.89
$28.89

18-8 Stainless Steel.

$28.89 - $28.89
$28.89
$28.89 - $28.89
$28.89
Steel Driver Bits #3

Steel Driver Bits #3

$23.29 - $23.29
$23.29
$23.29 - $23.29
$23.29

2" Long, 1/4" Hex Drive

$23.29 - $23.29
$23.29
$23.29 - $23.29
$23.29
Seachoice 00674 1/2"-13 x 3' Threaded Rod - Stainless

Seachoice 00674 1/2"-13 x 3' Threaded Rod - Stainless

$51.29 - $51.29
$51.29
$51.29 - $51.29
$51.29

18-8 Stainless Steel.

$51.29 - $51.29
$51.29
$51.29 - $51.29
$51.29
Nylon Flat Washer 5/8", 0.62" Thick, OD 1-1/4"

Nylon Flat Washer 5/8", 0.62" Thick, OD 1-1/4"

$17.89 - $17.89
$17.89
$17.89 - $17.89
$17.89

Nylon

$17.89 - $17.89
$17.89
$17.89 - $17.89
$17.89
Lock Washer, 5/8"

Lock Washer, 5/8"

$63.39 - $63.39
$63.39
$63.39 - $63.39
$63.39

18-8 Stainless Steel.

$63.39 - $63.39
$63.39
$63.39 - $63.39
$63.39
Phillips Machine Screw - Pan Head. 3/8"-16 x 2"

Phillips Machine Screw - Pan Head. 3/8"-16 x 2"

$185.79 - $185.79
$185.79
$185.79 - $185.79
$185.79

18-8 Stainless Steel.

$185.79 - $185.79
$185.79
$185.79 - $185.79
$185.79
Phillips Machine Screw - Pan Head. 5/16"-18 x 1"

Phillips Machine Screw - Pan Head. 5/16"-18 x 1"

$95.49 - $95.49
$95.49
$95.49 - $95.49
$95.49

18-8 Stainless Steel.

$95.49 - $95.49
$95.49
$95.49 - $95.49
$95.49
Phillips Machine Screw - Pan Head. 1/4"-20 x 2-1/2"

Phillips Machine Screw - Pan Head. 1/4"-20 x 2-1/2"

$48.49 - $48.49
$48.49
$48.49 - $48.49
$48.49

18-8 Stainless Steel.

$48.49 - $48.49
$48.49
$48.49 - $48.49
$48.49
Tee Nut - Stainless 1/4"-20

Tee Nut - Stainless 1/4"-20

$62.19 - $62.19
$62.19
$62.19 - $62.19
$62.19

18-8 Stainless Steel.

$62.19 - $62.19
$62.19
$62.19 - $62.19
$62.19
Carriage Bolt, 1/2"-13 x 5"

Carriage Bolt, 1/2"-13 x 5"

$49.39 - $49.39
$49.39
$49.39 - $49.39
$49.39
10.0item | $49.39 / 10item

Hot Dipped Galvanized.

$49.39 - $49.39
$49.39
$49.39 - $49.39
$49.39
10.0item | $49.39 / 10item
Nylon Insert Locknut - Stainless 5/16-24

Nylon Insert Locknut - Stainless 5/16-24

$120.79 - $120.79
$120.79
$120.79 - $120.79
$120.79

18-8 Stainless Steel.

$120.79 - $120.79
$120.79
$120.79 - $120.79
$120.79
Seachoice 00671 5/16"-18 x 3' Threaded Rod - Stainless

Seachoice 00671 5/16"-18 x 3' Threaded Rod - Stainless

$41.79 - $41.79
$41.79
$41.79 - $41.79
$41.79

18-8 Stainless Steel.

$41.79 - $41.79
$41.79
$41.79 - $41.79
$41.79
Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 10-24 X 1/2 In., Pack of 25

Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 10-24 X 1/2 In., Pack of 25

$83.19 - $83.19
$83.19
$83.19 - $83.19
$83.19

Seachoice Phillips Barrel Nuts With Truss Head are made from 18-8 stainless steel to resist the corrosive effects of marine environments. They prov...

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$83.19 - $83.19
$83.19
$83.19 - $83.19
$83.19
Carriage Bolt, 1/2"-13 x 4"

Carriage Bolt, 1/2"-13 x 4"

$85.49 - $85.49
$85.49
$85.49 - $85.49
$85.49

Hot Dipped Galvanized.

$85.49 - $85.49
$85.49
$85.49 - $85.49
$85.49
Carriage Bolt, 1/2"-13 x 3"

Carriage Bolt, 1/2"-13 x 3"

$140.39 - $140.39
$140.39
$140.39 - $140.39
$140.39

Hot Dipped Galvanized.

$140.39 - $140.39
$140.39
$140.39 - $140.39
$140.39
Flat Washer, 3/8", .062" Thick, OD 1"

Flat Washer, 3/8", .062" Thick, OD 1"

$29.49 - $29.49
$29.49
$29.49 - $29.49
$29.49

Hot Dipped Galvanized.

$29.49 - $29.49
$29.49
$29.49 - $29.49
$29.49
Lag Screw, 3/8 x 3"

Lag Screw, 3/8 x 3"

$34.19 - $34.19
$34.19
$34.19 - $34.19
$34.19

Hot Dipped Galvanized.

$34.19 - $34.19
$34.19
$34.19 - $34.19
$34.19
Lag Screw, 3/8 x 1-1/2"

Lag Screw, 3/8 x 1-1/2"

$99.89 - $99.89
$99.89
$99.89 - $99.89
$99.89

Hot Dipped Galvanized.

$99.89 - $99.89
$99.89
$99.89 - $99.89
$99.89
Seachoice 01533 Hex Nut, 1/2-13

Seachoice 01533 Hex Nut, 1/2-13

$56.69 - $56.69
$56.69
$56.69 - $56.69
$56.69

Hot Dipped Galvanized.

$56.69 - $56.69
$56.69
$56.69 - $56.69
$56.69
Flat Washer, 5/16", .062" Thick, OD 7/8"

Flat Washer, 5/16", .062" Thick, OD 7/8"

$65.49 - $65.49
$65.49
$65.49 - $65.49
$65.49

Hot Dipped Galvanized.

$65.49 - $65.49
$65.49
$65.49 - $65.49
$65.49
Seachoice 01531 Hex Nut, 3/8-16

Seachoice 01531 Hex Nut, 3/8-16

$26.89 - $26.89
$26.89
$26.89 - $26.89
$26.89

Hot Dipped Galvanized.

$26.89 - $26.89
$26.89
$26.89 - $26.89
$26.89
Flat Washer, 1/2", .078" Thick, OD 1-3/8"

Flat Washer, 1/2", .078" Thick, OD 1-3/8"

$77.99 - $77.99
$77.99
$77.99 - $77.99
$77.99

Hot Dipped Galvanized.

$77.99 - $77.99
$77.99
$77.99 - $77.99
$77.99
Flat Washer, M12, 2.5 mm Thick, OD 24 mm

Flat Washer, M12, 2.5 mm Thick, OD 24 mm

$93.29 - $93.29
$93.29
$93.29 - $93.29
$93.29

18-8 Stainless Steel.

$93.29 - $93.29
$93.29
$93.29 - $93.29
$93.29
Lag Screw, 5/16 x 4"

Lag Screw, 5/16 x 4"

$212.69 - $212.69
$212.69
$212.69 - $212.69
$212.69

Hot Dipped Galvanized.

$212.69 - $212.69
$212.69
$212.69 - $212.69
$212.69
Flat Washer, M10, 2 mm Thick, OD 20 mm

Flat Washer, M10, 2 mm Thick, OD 20 mm

$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19

18-8 Stainless Steel.

$19.19 - $19.19
$19.19
$19.19 - $19.19
$19.19
Flat Washer, M8M8, 1.6 mm Thick, OD 16 mm

Flat Washer, M8M8, 1.6 mm Thick, OD 16 mm

$99.69 - $99.69
$99.69
$99.69 - $99.69
$99.69

18-8 Stainless Steel.

$99.69 - $99.69
$99.69
$99.69 - $99.69
$99.69
Flat Washer, M5, 1 mm Thick, OD 10 mm

Flat Washer, M5, 1 mm Thick, OD 10 mm

$19.79 - $19.79
$19.79
$19.79 - $19.79
$19.79

18-8 Stainless Steel.

$19.79 - $19.79
$19.79
$19.79 - $19.79
$19.79
Flat Washer, M4, 0.8 mm Thick, OD 9 mm

Flat Washer, M4, 0.8 mm Thick, OD 9 mm

$56.09 - $56.09
$56.09
$56.09 - $56.09
$56.09

18-8 Stainless Steel.

$56.09 - $56.09
$56.09
$56.09 - $56.09
$56.09