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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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Mercury MerCruiser 3/8"-16 Hex Head Screw - 10-34353

$3.89 - $3.89
$3.89
$3.89
$3.89 - $3.89
$3.89
in stock

The Mercury MerCruiser Quicksilver 10-34353 is a genuine Mercury Marine OEM hex head screw used as diagram-specific mounting hardware on select Mer...

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$3.89 - $3.89
$3.89
$3.89
$3.89 - $3.89
$3.89

Mercury MerCruiser #10-32 Well Nut - 11-42290

$0.00 - $0.00
$0.00
$3.28
$3.28 - $3.28
$3.28
Only 4 left!

The Mercury MerCruiser Quicksilver 11-42290 is a genuine Mercury Marine OEM well nut used as diagram-specific expansion mounting hardware on select...

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$0.00 - $0.00
$0.00
$3.28
$3.28 - $3.28
$3.28

Mercury 4-Stroke Outboard Oil Drain Screw Washer - 12-803516

$0.00 - $0.00
$0.00
$9.85
$9.85 - $9.85
$9.85
in stock

The Mercury MerCruiser Quicksilver 12-803516 is a genuine Mercury Marine OEM engine oil drain screw washer used on select small Mercury 4-stroke ou...

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$0.00 - $0.00
$0.00
$9.85
$9.85 - $9.85
$9.85

Mercury MerCruiser 1/4-28 Hex Nut - 11-8267139

$0.00 - $0.00
$0.00
$3.81
$3.81 - $3.81
$3.81
in stock

The Mercury MerCruiser Quicksilver 11-8267139 is a genuine Mercury Marine OEM .250-28 hex nut used as diagram-specific fastening hardware across se...

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$0.00 - $0.00
$0.00
$3.81
$3.81 - $3.81
$3.81

Volvo Penta Split Pin - 3885524

$4.20 - $4.20
$4.20
$4.20
$4.20 - $4.20
$4.20
Only 2 left!

The Volvo Penta 3885524 is a genuine Volvo Penta OEM split pin, also commonly referred to as a cotter pin, used as diagram-specific retaining hardw...

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$4.20 - $4.20
$4.20
$4.20
$4.20 - $4.20
$4.20

Volvo Penta Lock Nut - 990990

$0.00 - $0.00
$0.00
$4.90
$4.90 - $4.90
$4.90
in stock

The Volvo Penta 990990 is a genuine Volvo Penta OEM lock nut used as diagram-specific structural hardware on select Volvo Penta diesel engine, ster...

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$0.00 - $0.00
$0.00
$4.90
$4.90 - $4.90
$4.90

Mercury MerCruiser Anchor Pin Flat Washer - 12-85058

$0.00 - $0.00
$0.00
$6.14
$6.14 - $6.14
$6.14
in stock

The Mercury MerCruiser Quicksilver 12-85058 is a genuine Mercury Marine OEM flat washer used in select MerCruiser sterndrive, transom, trim, and Me...

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$0.00 - $0.00
$0.00
$6.14
$6.14 - $6.14
$6.14

Mercury MerCruiser Flat Washer 2-Pack - 12-44164

$0.00 - $0.00
$0.00
$6.14
$6.14 - $6.14
$6.14
Only 2 left!

The Mercury MerCruiser Quicksilver 12-44164 is a genuine Mercury Marine OEM flat washer used in select MerCruiser sterndrive, transom, and engine a...

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$0.00 - $0.00
$0.00
$6.14
$6.14 - $6.14
$6.14

Mercury MerCruiser Propeller Shaft Toothed Lockwasher - 13-423511

$0.00 - $0.00
$0.00
$4.41
$4.41 - $4.41
$4.41
Only 2 left!

The Mercury MerCruiser Quicksilver 13-423511 is a genuine Mercury Marine OEM toothed lockwasher used in select Mercury, Mariner, and MerCruiser pro...

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$0.00 - $0.00
$0.00
$4.41
$4.41 - $4.41
$4.41

Mercury Mariner M8 Mounting Stud - 16-424632

$0.00 - $0.00
$0.00
$25.06
$25.06 - $25.06
$25.06
Only 2 left!

The Mercury MerCruiser Quicksilver 16-424632 is a genuine Mercury Marine OEM metric mounting stud used as diagram-specific bracket and component ha...

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$0.00 - $0.00
$0.00
$25.06
$25.06 - $25.06
$25.06

Mercury MerCruiser - Pinion Nut - 11-35921

$0.00 - $0.00
$0.00
$11.99
$11.99 - $11.99
$11.99
Only 1 left!

The Mercury MerCruiser Quicksilver Pinion Nut 11-35921 is an OEM lower-unit gearcase fastener used to secure the pinion gear to the driveshaft in c...

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$0.00 - $0.00
$0.00
$11.99
$11.99 - $11.99
$11.99

Mercury MerCruiser - Propeller Tab Washer - 14-34817

$0.00 - $0.00
$0.00
$20.30
$20.30 - $20.30
$20.30
Only 4 left!

The Mercury MerCruiser Quicksilver Propeller Tab Washer 14-34817 is an OEM locking washer used to secure the propeller nut on compatible MerCruiser...

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$0.00 - $0.00
$0.00
$20.30
$20.30 - $20.30
$20.30

Mercury MerCruiser - Screw (Pack of 5) - 10-34763

$0.00 - $0.00
$0.00
$11.69
$11.69 - $11.69
$11.69
Only 5 left!

The Mercury MerCruiser Quicksilver Screw 10-34763 is an OEM marine fastener used in select legacy Mercury outboard and MerCruiser sterndrive assemb...

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$0.00 - $0.00
$0.00
$11.69
$11.69 - $11.69
$11.69

Mercury - Cotter Pin - 18-54929

$0.00 - $0.00
$0.00
$8.94
$8.94 - $8.94
$8.94
Only 1 left!

The Mercury Quicksilver Cotter Pin 18-54929 is an OEM mechanical locking fastener used in select MerCruiser sterndrive transom and swivel assemblie...

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$0.00 - $0.00
$0.00
$8.94
$8.94 - $8.94
$8.94

Mercury - Gimbal Housing Lock Nut - 11-34087

$0.00 - $0.00
$0.00
$12.44
$12.44 - $12.44
$12.44
Only 4 left!

The Mercury Quicksilver Gimbal Housing Lock Nut 11-34087 is an OEM-style red Nyloc hex locking nut used in select MerCruiser transom and gimbal hou...

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$0.00 - $0.00
$0.00
$12.44
$12.44 - $12.44
$12.44

Mercury - Double-Wound Split Lock Washer - 13-33734

$0.00 - $0.00
$0.00
$4.04
$4.04 - $4.04
$4.04
Only 2 left!

The Mercury Quicksilver Double-Wound Split Lock Washer 13-33734 is an OEM heavy-duty lock washer used in select MerCruiser high-vibration mounting ...

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$0.00 - $0.00
$0.00
$4.04
$4.04 - $4.04
$4.04

Mercury MerCruiser - Rear Engine Mount Washer - 12-32834

$0.00 - $0.00
$0.00
$10.64
$10.64 - $10.64
$10.64
in stock

The Mercury MerCruiser Quicksilver Rear Engine Mount Washer 12-32834 is an OEM structural washer used in select MerCruiser rear engine mount, flywh...

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$0.00 - $0.00
$0.00
$10.64
$10.64 - $10.64
$10.64

Mercury - Engine Mounting Screw - 10-8M2021918

$0.00 - $0.00
$0.00
$3.89
$3.89 - $3.89
$3.89
Only 2 left!

The Mercury Quicksilver Engine Mounting Screw 10-8M2021918 is an OEM structural fastener used in select Mercury/MerCruiser engine mounting applicat...

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$0.00 - $0.00
$0.00
$3.89
$3.89 - $3.89
$3.89

Mercury MerCruiser Quicksilver Stainless Nut 1/4-20 814101

$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84
Only 5 left!

Mercury MerCruiser Quicksilver 11-814101 is a .250-20 stainless steel nut used across select Mercury, Mariner, and MerCruiser assemblies. Current M...

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$3.84 - $3.84
$3.84
$3.84 - $3.84
$3.84

Mercury MerCruiser Quicksilver Bell Housing Washer 806241

$9.04 - $9.04
$9.04
$9.04 - $9.04
$9.04
Only 4 left!

Mercury MerCruiser Quicksilver 12-806241 is a bell housing washer used on select MerCruiser bell housing assemblies, including applications identif...

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$9.04 - $9.04
$9.04
$9.04 - $9.04
$9.04

Mercury MerCruiser Black Oxide Screw 438-14 x 2.060 843917

$0.00 - $0.00
$0.00
$12.65
$12.65 - $12.65
$12.65
Only 1 left!

Mercury MerCruiser 843917 is a genuine OEM black oxide screw sized .438-14 x 2.060. Current Mercury dealer references show 843917 superseded to 8M0...

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$0.00 - $0.00
$0.00
$12.65
$12.65 - $12.65
$12.65

Mercury Outboard Latch Lever Screw M6 x 30 40019130

$2.74 - $2.74
$2.74
$2.74
$2.74 - $2.74
$2.74
Only 1 left!

Mercury Quicksilver 40019130, commonly listed as 10-40019130, is a genuine OEM M6 x 30 screw. Current Mercury parts sources identify it simply as S...

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$2.74 - $2.74
$2.74
$2.74
$2.74 - $2.74
$2.74

Mercury MerCruiser Screw M6 x 14 4000327

$4.45 - $4.45
$4.45
$4.45
$4.45 - $4.45
$4.45
in stock

Mercury MerCruiser Quicksilver 4000327, commonly listed as 10-4000327, is a genuine OEM screw identified by current Mercury dealer sources as SCREW...

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$4.45 - $4.45
$4.45
$4.45
$4.45 - $4.45
$4.45

Mercury MerCruiser Screw .437-14 x 1.250 29081

$7.41 - $7.41
$7.41
$7.41
$7.41 - $7.41
$7.41
Only 5 left!

Mercury MerCruiser Quicksilver 29081, commonly listed as 10-29081, is a genuine OEM screw identified by current Mercury dealer sources as SCREW (.4...

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$7.41 - $7.41
$7.41
$7.41
$7.41 - $7.41
$7.41

Mercury MerCruiser Screw .250-20 x .625 14070

$19.79 - $19.79
$19.79
$19.79
$19.79 - $19.79
$19.79
Only 2 left!

Mercury MerCruiser Quicksilver 14070, commonly listed as 10-14070, is a genuine OEM screw sized .250-20 x .625. Current Mercury dealer references s...

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

ABA #12 Stainless Steel Hose Clamp 7/8" – 1-1/4" (ABA-13632)

$9.54 - $9.54
$9.54
$9.54
$9.54 - $9.54
$9.54
in stock

The ABA #12 Stainless Steel Hose Clamp is a precision-engineered worm-drive clamp with a clamping range of 7/8" to 1-1/4" — purpose-built for deman...

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$9.54 - $9.54
$9.54
$9.54
$9.54 - $9.54
$9.54

MOB Mounting Bracket Model 403 – Black (MOB-MBRKT-M2B)

$12.63 - $12.63
$12.63
$12.63 - $12.63
$12.63
Only 1 left!

The MOB Mounting Bracket Model 403 in Black is a dedicated mounting solution for man overboard (MOB) safety equipment. Designed to provide a secure...

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$12.63 - $12.63
$12.63
$12.63 - $12.63
$12.63

Volvo Penta Stud 3858964

$29.50 - $29.50
$29.50
$29.50
$29.50 - $29.50
$29.50
Only 3 left!

Volvo Penta 3858964 is a genuine OEM stud used in Volvo Penta marine engine applications. Volvo Penta's official parts shop identifies part 3858964...

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$29.50 - $29.50
$29.50
$29.50
$29.50 - $29.50
$29.50

Volvo Penta Hexagon Screw 191844

$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60
Only 1 left!

Volvo Penta 191844 is a genuine OEM hexagon screw used in Volvo Penta marine propulsion applications. Volvo Penta's own parts catalog identifies 19...

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$18.60 - $18.60
$18.60
$18.60
$18.60 - $18.60
$18.60
Sold out

Mercury MerCruiser Keyed Washer 18323

$37.34 - $37.34
$37.34
$37.34 - $37.34
$37.34
Out of stock

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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$37.34 - $37.34
$37.34
$37.34 - $37.34
$37.34
Sold out

MerCruiser Washer – 895146

$5.10 - $5.10
$5.10
$5.10
$5.10 - $5.10
$5.10
in stock

Genuine MerCruiser OEM Washer – Part No. 895146Keep your MerCruiser engine assembled to factory specification with the genuine MerCruiser OEM Washe...

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$5.10 - $5.10
$5.10
$5.10
$5.10 - $5.10
$5.10

Volvo Penta Screw – 855605

$5.10 - $5.10
$5.10
$5.10
$5.10 - $5.10
$5.10
Only 4 left!

Volvo Penta OEM Screw – 855605Genuine Volvo Penta OEM screw for Volvo Penta marine engine and sterndrive applications. Used to secure engine covers...

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$5.10 - $5.10
$5.10
$5.10
$5.10 - $5.10
$5.10

Volvo Penta Hexagon Nut – 955806

$0.00 - $0.00
$0.00
$9.98
$9.98 - $9.98
$9.98
Only 4 left!

Volvo Penta OEM Hexagon Nut – 955806Genuine Volvo Penta OEM hexagon nut for Volvo Penta marine engine and sterndrive applications. Used to secure e...

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$0.00 - $0.00
$0.00
$9.98
$9.98 - $9.98
$9.98

Volvo Penta Hexagon Screw – 959968

$12.70 - $12.70
$12.70
$12.70
$12.70 - $12.70
$12.70
Only 4 left!

Volvo Penta 959968 is a genuine OEM hexagon screw used in select Volvo Penta marine engine and sterndrive applications. Public Volvo Penta dealer l...

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$12.70 - $12.70
$12.70
$12.70
$12.70 - $12.70
$12.70

Volvo Penta Engine Drain Plug – 21114522

$7.30 - $7.30
$7.30
$7.30
$7.30 - $7.30
$7.30
in stock

Volvo Penta 21114522 is a genuine OEM engine cooling / manifold water drain plug used on selected Volvo Penta marine engines. Current dealer listin...

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$7.30 - $7.30
$7.30
$7.30
$7.30 - $7.30
$7.30

Volvo Penta Washer – 955893

$0.00 - $0.00
$0.00
$0.50
$0.50 - $0.50
$0.50
in stock

Volvo Penta OEM Washer – 955893Genuine Volvo Penta OEM washer for use across Volvo Penta marine engine and sterndrive applications. Used as a seali...

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$0.00 - $0.00
$0.00
$0.50
$0.50 - $0.50
$0.50

PCM Nut R017072

$94.10 - $94.10
$94.10
$94.10
$94.10 - $94.10
$94.10
Only 1 left!

Secure the transmission output flange and maintain proper drivetrain connection with the PCM 40A Transmission Output Flange Nut (1.23:1 Ratio). Thi...

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$94.10 - $94.10
$94.10
$94.10
$94.10 - $94.10
$94.10

PCM Cylinder Head -Exhaust Manifold Stud R031035.

$11.59 - $11.59
$11.59
$11.59
$11.59 - $11.59
$11.59
in stock

Secure the exhaust manifold to the cylinder head with the PCM Cylinder Head / Exhaust Manifold Stud R031035. This genuine Pleasurecraft Marine (PCM...

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$11.59 - $11.59
$11.59
$11.59
$11.59 - $11.59
$11.59

PCM 6.0L Short Elbow -Manifold Stud R031036

$13.91 - $13.91
$13.91
$13.91
$13.91 - $13.91
$13.91
Only 4 left!

Secure the exhaust elbow to the manifold with the PCM 6.0L Short Elbow / Manifold Stud R031036. This genuine Pleasurecraft Marine / Crusader OEM st...

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$13.91 - $13.91
$13.91
$13.91
$13.91 - $13.91
$13.91

PCM Exhaust Elbow - Manifold Stud R031037

$14.94 - $14.94
$14.94
$14.94
$14.94 - $14.94
$14.94
Only 4 left!

Secure the exhaust elbow to the manifold with the PCM Exhaust Elbow / Manifold Stud R031037. This genuine Pleasurecraft Marine (PCM) OEM stud is de...

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$14.94 - $14.94
$14.94
$14.94
$14.94 - $14.94
$14.94

Mercury Engine Nut - 896963

$0.00 - $0.00
$0.00
$9.18
$9.18 - $9.18
$9.18
in stock

Mercury MerCruiser Quicksilver M12 Hex Nut 11-896963 Product Description The Mercury MerCruiser Quicksilver 11-896963 is a genuine Mercury Marine O...

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$0.00 - $0.00
$0.00
$9.18
$9.18 - $9.18
$9.18

Mercury MerCruiser Screw Kit 8M0058388

$18.97 - $18.97
$18.97
$18.97
$18.97 - $18.97
$18.97
Only 2 left!

Restore proper gearcase sealing during lower unit service with the Mercury MerCruiser Screw Kit 8M0058388. This genuine Mercury Marine OEM screw ki...

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$18.97 - $18.97
$18.97
$18.97
$18.97 - $18.97
$18.97

Mini T-Bolt | G5AB-08

$3.96 - $3.96
$3.96
$3.96
$3.96 - $3.96
$3.96
in stock

High-quality mini T-bolt engineered for reliable performance in marine applications. This precision-manufactured T-bolt provides secure fastening f...

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$3.96 - $3.96
$3.96
$3.96
$3.96 - $3.96
$3.96

Cummins Stud | 3919666

$40.51 - $40.51
$40.51
$40.51
$40.51 - $40.51
$40.51
in stock

Genuine Cummins OEM stud engineered for reliable performance in marine diesel engines. This precision-manufactured stud ensures proper clamping for...

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$40.51 - $40.51
$40.51
$40.51
$40.51 - $40.51
$40.51

Hose Clamp 10.5mm-12mm | G5AB-11

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

Precision hose clamp designed for 10.5mm to 12mm diameter hoses and tubing. This reliable clamp provides secure, leak-free connections for fuel lin...

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

Mini T-Bolt ABA Clamp

$4.58 - $4.58
$4.58
$4.58
$4.58 - $4.58
$4.58
in stock

Heavy-duty mini T-bolt ABA clamp engineered for secure, high-pressure connections in marine applications. Precision-machined construction provides ...

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$4.58 - $4.58
$4.58
$4.58
$4.58 - $4.58
$4.58

Yamaha Hexagon Bolt - OEM Part 90105-10M00-00

$14.61 - $14.61
$14.61
$14.61
$14.61 - $14.61
$14.61
Only 1 left!

Genuine Yamaha OEM hexagon bolt (663 series). Factory-authorized marine hardware designed for precision fit and corrosion resistance. OEM Part Numb...

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$14.61 - $14.61
$14.61
$14.61
$14.61 - $14.61
$14.61

Volvo Penta Hexagon Nut 60112771

$10.00 - $10.00
$10.00
$10.00
$10.00 - $10.00
$10.00
Only 4 left!

Genuine Volvo Penta hexagon nut manufactured to OEM specifications for marine applications. Precision-engineered fastener designed for reliable per...

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$10.00 - $10.00
$10.00
$10.00
$10.00 - $10.00
$10.00