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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

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Hexagon Screw - Volvo Penta OEM Part 940136

$3.10 - $3.10
$3.10
$3.10
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$3.10
Only 4 left!

Volvo Penta OEM hexagon screw part number 940136 designed for reliable engine assembly. This precision-engineered hex head screw provides secure fa...

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$3.10 - $3.10
$3.10
$3.10
$3.10 - $3.10
$3.10

Hexagon Screw - Volvo Penta OEM Part 940186

$2.20 - $2.20
$2.20
$2.20
$2.20 - $2.20
$2.20
Only 4 left!

Volvo Penta OEM hexagon screw part number 940186 designed for reliable engine assembly. This precision-engineered hex head screw provides secure fa...

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$2.20 - $2.20
$2.20
$2.20
$2.20 - $2.20
$2.20

Washer - Volvo Penta OEM Part 942551

$2.30 - $2.30
$2.30
$2.30
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$2.30
Only 4 left!

Volvo Penta OEM washer part number 942551 designed for reliable engine assembly. This precision-engineered washer provides proper load distribution...

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$2.30 - $2.30
$2.30
$2.30
$2.30 - $2.30
$2.30

Volvo Penta Engine Locating Pin 950542

$0.30 - $0.30
$0.30
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$0.30
Only 4 left!

Volvo Penta 950542 is a genuine OEM pin used in a wide range of Volvo Penta engine assemblies. Current parts references consistently list it as an ...

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$0.30 - $0.30
$0.30
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$0.30

Spring Pin - Volvo Penta OEM Part 951936

$1.30 - $1.30
$1.30
$1.30
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$1.30
Only 4 left!

Volvo Penta OEM spring pin part number 951936 designed for reliable engine assembly and retention. This precision-engineered spring pin provides se...

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$1.30 - $1.30
$1.30
$1.30
$1.30 - $1.30
$1.30

Nylon Washers 1/2" - Marine Hardware Washers

$6.73 - $6.73
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$6.73
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$6.73
in stock

Nylon washers 1/2" designed for marine hardware applications. These non-metallic washers provide reliable fastening with corrosion resistance and e...

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$6.73 - $6.73
$6.73
$6.73
$6.73 - $6.73
$6.73

Mini T-Bolt ABA Clamp - Marine Stainless Steel Hose Clamp

$4.84 - $4.84
$4.84
$4.84
$4.84 - $4.84
$4.84
in stock

Mini T-bolt ABA clamp designed for reliable marine hose connections. This stainless steel clamp provides secure fastening with superior clamping fo...

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$4.84 - $4.84
$4.84
$4.84
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$4.84

Lock Washer - Marine Stainless Steel Hardware

$2.08 - $2.08
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$2.08
in stock

Lock washer designed for reliable marine hardware connections. This split-ring washer provides secure fastening by preventing nuts and bolts from l...

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$2.08 - $2.08
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$2.08
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$2.08

Mini T-Bolt Hose Clamp - Marine Stainless Steel Clamp

$4.32 - $4.32
$4.32
$4.32
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$4.32
in stock

Mini T-bolt hose clamp designed for reliable marine hose connections. This stainless steel clamp provides secure fastening with superior clamping f...

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$4.32 - $4.32
$4.32
$4.32
$4.32 - $4.32
$4.32

Hose Clamp 9.5mm-11mm - Marine Stainless Steel Clamp

$4.84 - $4.84
$4.84
$4.84
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$4.84
in stock

Stainless steel hose clamp for 9.5mm-11mm applications, designed for reliable marine hose connections. This corrosion-resistant clamp provides secu...

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$4.84 - $4.84
$4.84
$4.84
$4.84 - $4.84
$4.84

MerCruiser Stud - 5-Pack - Marine Engine Hardware

$7.79 - $7.79
$7.79
$7.79
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$7.79
Only 5 left!

MerCruiser OEM studs (5-pack) designed for reliable marine engine assembly and maintenance. These precision-engineered fasteners ensure proper torq...

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$7.79 - $7.79
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$7.79

MerCruiser Nut - Marine Engine Hardware

$1.80 - $1.80
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MerCruiser OEM nut designed for reliable marine engine assembly and maintenance. This precision-engineered fastener ensures proper torque retention...

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$1.80

1" Black Dual Lock Fastener - Marine Hook and Loop Tape

$9.03 - $9.03
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$9.03
in stock

1" black dual lock fastener designed for secure marine applications. This heavy-duty hook and loop fastener provides reliable attachment for canvas...

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$9.03 - $9.03
$9.03
$9.03
$9.03 - $9.03
$9.03

Mercury Banjo Bolt - 8M6002655

$217.49 - $217.49
$217.49
$217.49
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$217.49
Only 4 left!

Genuine Mercury banjo bolt engineered for secure hydraulic and fuel line connections in marine engine systems. This OEM hollow bolt provides reliab...

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$217.49 - $217.49
$217.49
$217.49
$217.49 - $217.49
$217.49

Mercury Marine Screw - 90126

$10.19 - $10.19
$10.19
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$10.19
Only 1 left!

Genuine Mercury marine screw engineered for reliable fastening in demanding marine environments. This OEM fastener is precision-manufactured to exa...

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$10.19 - $10.19
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$10.19

PCM Socket Head Cap Screw 3/8-16 x 1-1/8" - Marine Engine Hardware

$4.47 - $4.47
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$4.47
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OEM socket head cap screw (SHC) designed for PCM marine engines. This 3/8-16 x 1-1/8" stainless steel fastener provides secure, corrosion-resistant...

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Crusader Lock Washer 3/8" Zinc Plated - OEM Part RS2180

$0.21 - $0.21
$0.21
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$0.21
Out of stock

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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$0.21 - $0.21
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Volvo Penta Socket Head Cap Screw - OEM Part 984257

$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70
Only 5 left!

Genuine Volvo Penta socket head cap screw engineered to OEM specifications for secure fastening in marine engine and drive applications. This preci...

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$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70

Volvo Penta Stud - OEM Part 21796363

$52.30 - $52.30
$52.30
$52.30
$52.30 - $52.30
$52.30
in stock

Genuine Volvo Penta stud engineered to OEM specifications for secure fastening in marine engine and drive applications. This precision-manufactured...

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$52.30 - $52.30
$52.30
$52.30
$52.30 - $52.30
$52.30

Volvo Penta Washer - OEM Part 3852105

$2.90 - $2.90
$2.90
$2.90
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$2.90
in stock

Genuine Volvo Penta washer engineered to OEM specifications for proper load distribution and fastener retention in marine engine and drive applicat...

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$2.90 - $2.90
$2.90
$2.90
$2.90 - $2.90
$2.90

Volvo Penta Washer - OEM Part 3857588

$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70
Only 2 left!

Genuine Volvo Penta washer engineered to OEM specifications for proper load distribution and fastener retention in marine engine and drive applicat...

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$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70

Volvo Penta Hex Bolt 60114292

$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60
in stock

Volvo Penta 60114292 is a genuine OEM hexagon screw / hex bolt used in selected Volvo Penta transom and clamp-ring related assemblies. Volvo Penta’...

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$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60

Volvo Penta Hex Socket Cap Screw - OEM Part 984298

$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70
in stock

Genuine Volvo Penta hex socket cap screw (six point socket screw) engineered to OEM specifications for secure fastening in marine engine and drive ...

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$8.70 - $8.70
$8.70
$8.70
$8.70 - $8.70
$8.70

Volvo Penta Flange Screw - OEM Part 984736

$1.00 - $1.00
$1.00
$1.00
$1.00 - $1.00
$1.00
in stock

Genuine Volvo Penta flange screw engineered to OEM specifications for secure fastening in marine engine and drive applications. This precision-manu...

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$1.00 - $1.00
$1.00
$1.00
$1.00 - $1.00
$1.00

Volvo Penta Flange Screw - OEM Part 984742

$12.20 - $12.20
$12.20
$12.20
$12.20 - $12.20
$12.20
in stock

Genuine Volvo Penta flange screw engineered to OEM specifications for secure fastening in marine engine and drive applications. This precision-manu...

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$12.20 - $12.20
$12.20
$12.20
$12.20 - $12.20
$12.20

Volvo Penta Socket Head Screw 60112101

$2.20 - $2.20
$2.20
$2.20
$2.20 - $2.20
$2.20
in stock

Volvo Penta 60112101 is a genuine OEM six point socket screw / socket head screw used in selected Volvo Penta assemblies. Volvo Penta's official pa...

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$2.20 - $2.20
$2.20
$2.20
$2.20 - $2.20
$2.20
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Marine Bracket for LALIZAS Fire Extinguisher CO2 11lbs (5kg)

$104.99
$104.99 - $104.99
$104.99
$89.26
$89.26 - $89.26
$89.26
In stock

Heavy-Duty Marine Fire Extinguisher BracketSecurely mount your LALIZAS CO2 fire extinguisher with this professional-grade marine bracket. Designed ...

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$104.99
$104.99 - $104.99
$104.99
$89.26
$89.26 - $89.26
$89.26
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Marine Bracket for LALIZAS Fire Extinguisher Foam 2.37gal (9L)

$117.99
$117.99 - $117.99
$117.99
$101.11
$101.11 - $101.11
$101.11
In stock

Heavy-Duty Marine Fire Extinguisher BracketSecurely mount your LALIZAS foam fire extinguisher with this professional-grade marine bracket. Designed...

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$117.99
$117.99 - $117.99
$117.99
$101.11
$101.11 - $101.11
$101.11
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Marine Bracket for LALIZAS Fire Extinguisher Dry Powder 19.8lbs (9kg)

$117.99
$117.99 - $117.99
$117.99
$101.11
$101.11 - $101.11
$101.11
In stock

Heavy-Duty Marine Fire Extinguisher BracketSecurely mount your LALIZAS dry powder fire extinguisher with this professional-grade marine bracket. De...

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$117.99
$117.99 - $117.99
$117.99
$101.11
$101.11 - $101.11
$101.11
Save 14% Save %
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Marine Bracket for LALIZAS Fire Extinguisher Dry Powder 13.2lbs (6kg)

$104.99
$104.99 - $104.99
$104.99
$89.26
$89.26 - $89.26
$89.26
In stock

Heavy-Duty Marine Fire Extinguisher BracketSecurely mount your LALIZAS dry powder fire extinguisher with this professional-grade marine bracket. De...

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$104.99
$104.99 - $104.99
$104.99
$89.26
$89.26 - $89.26
$89.26
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LALIZAS Marine Hatch Fastener - Stainless Steel 316 1" x 3" (26 x 79 mm)

$14.99 - $14.99
$14.99
$14.99 - $14.99
$14.99
in stock

LALIZAS Marine Hatch Fastener - Stainless Steel 316Premium marine-grade hatch fastener manufactured by LALIZAS from corrosion-resistant stainless s...

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$14.99 - $14.99
$14.99
$14.99 - $14.99
$14.99