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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

Seachoice 59581 Stainless Steel Phillips Tapping Screw - Pan Head

Seachoice 59581 Stainless Steel Phillips Tapping Screw - Pan Head

$3.99 - $3.99
$3.99
$3.99 - $3.99
$3.99
Item locally warehoused

18-8 Stainless Steel.

$3.99 - $3.99
$3.99
$3.99 - $3.99
$3.99
Seachoice Stainless Steel Phillips Machine Screw - Flat Head, 1/4-20 x 1"

Seachoice Stainless Steel Phillips Machine Screw - Flat Head, 1/4-20 x 1"

$8.49 - $8.49
$8.49
$8.49 - $8.49
$8.49
Item locally warehoused

Stainless Steel.

$8.49 - $8.49
$8.49
$8.49 - $8.49
$8.49
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$3.59 - $3.59
$3.59
$3.59 - $3.59
$3.59
Item locally warehoused

Stainless Steel.

$3.59 - $3.59
$3.59
$3.59 - $3.59
$3.59
Seachoice Stainless Steel Cotter Ring, 1-1/8"

Seachoice Stainless Steel Cotter Ring, 1-1/8"

$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69
Item locally warehoused

Stainless Steel.

$3.69 - $3.69
$3.69
$3.69 - $3.69
$3.69
Seachoice Stainless Steel Nylon Insert Locknut, 10-24

Seachoice Stainless Steel Nylon Insert Locknut, 10-24

$16.99 - $16.99
$16.99
$16.99 - $16.99
$16.99
Item locally warehoused

Stainless Steel Nylon Insert Locknut

$16.99 - $16.99
$16.99
$16.99 - $16.99
$16.99
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$3.29 - $3.29
$3.29
$3.29 - $3.29
$3.29
Item locally warehoused

Stainless Steel.

$3.29 - $3.29
$3.29
$3.29 - $3.29
$3.29
Seachoice Stainless Steel Clevis Pin

Seachoice Stainless Steel Clevis Pin

$11.99 - $11.99
$11.99
$11.99 - $11.99
$11.99
Item locally warehoused

Stainless Steel.

$11.99 - $11.99
$11.99
$11.99 - $11.99
$11.99
Seachoice Stainless Steel Phillips Machine Screw - Pan Head

Seachoice Stainless Steel Phillips Machine Screw - Pan Head

$5.19 - $5.19
$5.19
$5.19 - $5.19
$5.19
Item locally warehoused

Stainless Steel.

$5.19 - $5.19
$5.19
$5.19 - $5.19
$5.19
Seachoice Stainless Steel Cotter Ring, 3/4"

Seachoice Stainless Steel Cotter Ring, 3/4"

$2.79 - $2.79
$2.79
$2.79 - $2.79
$2.79
Item locally warehoused

Stainless Steel.

$2.79 - $2.79
$2.79
$2.79 - $2.79
$2.79
Seachoice Stainless Steel Nylon Insert Locknut, 1/4"-20

Seachoice Stainless Steel Nylon Insert Locknut, 1/4"-20

$37.29 - $37.29
$37.29
$37.29 - $37.29
$37.29
Item locally warehoused

Stainless Steel Nylon Insert Locknut

$37.29 - $37.29
$37.29
$37.29 - $37.29
$37.29
Seachoice Screw Caps, Black, Fits #6 & #8

Seachoice Screw Caps, Black, Fits #6 & #8

$5.49 - $5.49
$5.49
$5.49 - $5.49
$5.49
Item locally warehoused

Screw Cap

$5.49 - $5.49
$5.49
$5.49 - $5.49
$5.49
Seachoice Stainless Steel Cotter Ring, 1-3/16"

Seachoice Stainless Steel Cotter Ring, 1-3/16"

$4.89 - $4.89
$4.89
$4.89 - $4.89
$4.89
Item locally warehoused

Stainless Steel.

$4.89 - $4.89
$4.89
$4.89 - $4.89
$4.89
Davis 540 Quick Fist Clamps Hold Objects from 7/8 to 2-1/4" Diameter (2/PK)

Davis 540 Quick Fist Clamps Hold Objects from 7/8 to 2-1/4" Diameter (2/PK)

$41.73 - $41.73
$41.73
$41.73 - $41.73
$41.73
Item locally warehoused

A rubber clamp that mounts easily to keep tools and equipment firmly in place. UV resistant and withstands extreme heat or cold. Terrific for marin...

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$41.73 - $41.73
$41.73
$41.73 - $41.73
$41.73
Seachoice Screw Caps, White, Fits #10 & #12

Seachoice Screw Caps, White, Fits #10 & #12

$5.89 - $5.89
$5.89
$5.89 - $5.89
$5.89
Item locally warehoused

Screw Cap

$5.89 - $5.89
$5.89
$5.89 - $5.89
$5.89
Seachoice 59994 Stainless Steel Toggles, Size 1/4-20
Sold out

Seachoice 59994 Stainless Steel Toggle Bolts – 1/4-20

$51.59 - $51.59
$51.59
$51.59 - $51.59
$51.59
Out of stock

Seachoice 59994 Stainless Steel Toggle Bolts – 1/4-20 Stainless steel toggle bolts for mounting hardware to hollow walls, bulkheads, and decks wher...

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$51.59 - $51.59
$51.59
$51.59 - $51.59
$51.59
Sold out
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$2.79 - $2.79
$2.79
$2.79 - $2.79
$2.79
Item locally warehoused

Stainless Steel.

$2.79 - $2.79
$2.79
$2.79 - $2.79
$2.79
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$6.09 - $6.09
$6.09
$6.09 - $6.09
$6.09
Item locally warehoused

Stainless Steel.

$6.09 - $6.09
$6.09
$6.09 - $6.09
$6.09
Seachoice Screw Caps, White, Fits #6 & #8

Seachoice Screw Caps, White, Fits #6 & #8

$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99
Item locally warehoused

Screw Cap

$7.99 - $7.99
$7.99
$7.99 - $7.99
$7.99
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$4.99 - $4.99
$4.99
$4.99 - $4.99
$4.99
Item locally warehoused

Stainless Steel.

$4.99 - $4.99
$4.99
$4.99 - $4.99
$4.99
Seachoice Stainless Steel Cotter Pin

Seachoice Stainless Steel Cotter Pin

$3.59 - $3.59
$3.59
$3.59 - $3.59
$3.59
Item locally warehoused

Stainless Steel.

$3.59 - $3.59
$3.59
$3.59 - $3.59
$3.59
Seachoice Stainless Steel Tapping and Machine Screw Kit, 226 Piece
Sold out

226-Piece Stainless Steel Marine Screw & Fastener Kit

$167.29 - $167.29
$167.29
$167.29 - $167.29
$167.29
Out of stock

The Only Fastener Kit You'll Want AboardWhether you're securing a cleat, mounting a transducer, or making a quick repair on the water, having the r...

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$167.29 - $167.29
$167.29
$167.29 - $167.29
$167.29
Sold out
Seachoice Stainless Steel Machine Screw Kit, 256 Piece
Sold out

Seachoice 256-Piece Stainless Steel Machine Screw Kit

$234.19 - $234.19
$234.19
$234.19 - $234.19
$234.19
Out of stock

Seachoice 256-Piece Stainless Steel Machine Screw Kit A comprehensive assortment of stainless steel machine screws, hex nuts, locknuts, and flat wa...

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$234.19 - $234.19
$234.19
$234.19 - $234.19
$234.19
Sold out
Seachoice Well Nuts

Seachoice Well Nuts

$8.99 - $8.99
$8.99
$8.99 - $8.99
$8.99
Item locally warehoused

Rubber and brass.

$8.99 - $8.99
$8.99
$8.99 - $8.99
$8.99
Seachoice Stainless Steel Cotter Ring Kit, 66 Piece, All Popular Sizes
Sold out

Stainless Steel Cotter Ring Kit – 66 Piece, All Popular Sizes

$44.49 - $44.49
$44.49
$44.49 - $44.49
$44.49
Out of stock

Stainless Steel Cotter Ring Kit – 66 PieceKeep your clevis pins locked in place with this comprehensive cotter ring assortment. Covering the five m...

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$44.49 - $44.49
$44.49
$44.49 - $44.49
$44.49
Sold out
Seachoice Well Nuts

Seachoice Well Nuts

$14.29 - $14.29
$14.29
$14.29 - $14.29
$14.29
Item locally warehoused

Rubber and brass.

$14.29 - $14.29
$14.29
$14.29 - $14.29
$14.29
Seachoice Stainless Steel Cotter Pin Kit, 66 Piece
Sold out

Seachoice 66-Piece Stainless Steel Cotter Pin Kit

$52.09 - $52.09
$52.09
$52.09 - $52.09
$52.09
Out of stock

Seachoice 66-Piece Stainless Steel Cotter Pin Kit A well-sorted assortment of the most commonly used cotter pin sizes, packaged in a compact storag...

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$52.09 - $52.09
$52.09
$52.09 - $52.09
$52.09
Sold out
Seachoice Stainless Steel Metric Machine Screw Kit, 240 Piece, Includes M4, M5 and M6 Screws of Various Lengths
Sold out

240-Piece Stainless Steel Metric Marine Fastener Kit – M4, M5 & M6

$145.29 - $145.29
$145.29
$145.29 - $145.29
$145.29
Out of stock

Metric Fasteners, Marine-ReadyIf your boat uses metric hardware — or you're working with imported electronics, European-spec fittings, or modern ou...

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$145.29 - $145.29
$145.29
$145.29 - $145.29
$145.29
Sold out
Seachoice Stainless Steel Tapping and Machine Screw Kit, 750 Piece
Sold out

Seachoice Stainless Steel Tapping & Machine Screw Kit, 750 Piece

$468.89 - $468.89
$468.89
$468.89 - $468.89
$468.89
Out of stock

Complete Marine Fastener Solution in One KitKeep your boat properly fastened and ready for anything on the water. This 750-piece stainless steel ta...

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$468.89 - $468.89
$468.89
$468.89 - $468.89
$468.89
Sold out
Seachoice Stainless Steel Tapping and Machine Screw Kit, 1,008 Piece
Sold out

Seachoice 1,008-Piece Stainless Steel Tapping & Machine Screw Kit (50-59436)

$855.59 - $855.59
$855.59
$855.59 - $855.59
$855.59
Out of stock

Seachoice 1,008-Piece Stainless Steel Tapping & Machine Screw KitA comprehensive stainless steel fastener assortment covering the most common s...

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$855.59 - $855.59
$855.59
$855.59 - $855.59
$855.59
Sold out

Sionyx RAM Mounts Camera System (SIO A013700)

$132.30 - $132.30
$132.30
$132.30 - $132.30
$132.30
Item locally warehoused

Professional mounting system for Sionyx cameras. Mount your camera in nearly any position with all the clamps, arms, and sockets you need for a ful...

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$132.30 - $132.30
$132.30
$132.30 - $132.30
$132.30
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West System 215 Caulking Gun (SKU: 215-CAULKGUN)

$32.83 - $32.83
$32.83
$32.83 - $32.83
$32.83
Out of stock

Wexford Regular Caulking Gun Apply sealants neatly and consistently with the Wexford Regular Caulking Gun, a dependable medium-duty tool designed f...

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$32.83 - $32.83
$32.83
$32.83 - $32.83
$32.83
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heavy-duty caulking gun, 325ml caulking gun, spouted cartridge gun, 12:1 ratio caulking gun, sealant gun, caulk applicator, manual caulking gun, TOO 110

Heavy-Duty Caulking Gun (SKU: 110-CAULKGUN)

$76.62 - $76.62
$76.62
$76.62 - $76.62
$76.62
1.0item | $76.62 / item
Only 1 left!

Heavy-Duty Caulking Gun Take on tougher sealing and bonding jobs with this Heavy-Duty Caulking Gun, built for reliable performance and smooth mater...

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$76.62 - $76.62
$76.62
$76.62 - $76.62
$76.62
1.0item | $76.62 / item

Mini-Sausage Sealant White 70ml | SIK-291I-WHT-70ML

$21.09 - $21.09
$21.09
$21.09 - $21.09
$21.09
11 in stock

Professional-grade mini-sausage sealant in white, formulated for marine sealing and bonding applications. This convenient 70ml mini-sausage format ...

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$21.09 - $21.09
$21.09
$21.09 - $21.09
$21.09

Mini-Sausage Sealant Black 70ml | SIK-291I-BLK-70ML

$21.09 - $21.09
$21.09
$21.09 - $21.09
$21.09
28 in stock

Professional-grade black marine sealant in a convenient 70ml mini-sausage cartridge format. Formulated for superior adhesion and flexibility in mar...

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$21.09 - $21.09
$21.09
$21.09 - $21.09
$21.09

Sikaflex-291 Marine Sealant Black 300mL Cartridge (SIK-291BLK-300ML)

$24.15 - $24.15
$24.15
$24.15 - $24.15
$24.15
176 in stock

Sikaflex-291 is the marine industry’s benchmark one-component polyurethane sealant and adhesive — trusted by boatbuilders, yards, and owners worldw...

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$24.15 - $24.15
$24.15
$24.15 - $24.15
$24.15

Mercury MerCruiser Bracket 898101635

$47.80 - $47.80
$47.80
$47.80 - $47.80
$47.80
Only 1 left!

Secure and support key engine control components with the Mercury MerCruiser Bracket 898101635. This genuine Mercury Marine OEM bracket is designed...

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$47.80 - $47.80
$47.80
$47.80 - $47.80
$47.80

Sikaflex UV Resistant Sealant - Black - 11oz Cartridge - Marine Adhesive

$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
47 in stock

Sikaflex UV resistant sealant in black, 11oz cartridge, designed for marine sealing and bonding applications. This premium polyurethane sealant pro...

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$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
Sold out

Permatex Black RTV Silicone Adhesive Sealant 300ml - 59213

$22.67 - $22.67
$22.67
$22.67 - $22.67
$22.67
Out of stock

The Permatex 59213 Black RTV Silicone Adhesive Sealant is a flexible, all-purpose black RTV silicone sealant supplied in a 300 ml cartridge for sea...

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$22.67 - $22.67
$22.67
$22.67 - $22.67
$22.67
Sold out

LALIZAS Lifebuoy Light Holder - Black Polycarbonate - Vertical Mount - For MOB Lights

$12.72 - $12.72
$12.72
$12.72 - $12.72
$12.72
86 in stock

LALIZAS Lifebuoy Light Holder - Black Polycarbonate - Vertical MountHeavy-duty polycarbonate lifebuoy light holder designed to securely mount and s...

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$12.72 - $12.72
$12.72
$12.72 - $12.72
$12.72
Sold out

LALIZAS Wall Mounting Kit - for Lifebuoy Ring Container - Stainless Steel Bracket

$42.82 - $42.82
$42.82
$42.82 - $42.82
$42.82
Out of stock

LALIZAS Wall Mounting Kit - for Lifebuoy Ring Container - Stainless Steel Bracket Heavy-duty wall mounting bracket designed specifically for LALIZA...

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$42.82 - $42.82
$42.82
$42.82 - $42.82
$42.82
Sold out
Replacement Deck Fill Cap, Red

Sea-Dog Red Clam Shell Deck Fill Replacement Cap – 1-1/4" NPSM (357090)

$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99
Item locally warehoused

The Sea-Dog 357090 Red Clam Shell Deck Fill Replacement Cap is a color-coded replacement cap for compatible Sea-Dog clam shell deck fill fittings. ...

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$25.99 - $25.99
$25.99
$25.99 - $25.99
$25.99
Deck Fill Cap-Black (Waste)

Sea-Dog Black Waste Deck Fill Replacement Cap – 1-1/4" NPSM (357018)

$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Item locally warehoused

The Sea-Dog 357018 Black Waste Deck Fill Replacement Cap is a color-coded replacement cap for Sea-Dog 357010 series waste deck fill fittings. The b...

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$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Deck Fill Cap-Green (Diesel)

Sea-Dog Green Diesel Deck Fill Replacement Cap – 1-1/4" NPSM (357016)

$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Item locally warehoused

The Sea-Dog 357016 Green Diesel Deck Fill Replacement Cap is a color-coded replacement cap for Sea-Dog 357010 series diesel deck fill fittings. The...

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$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Cap For 357010-Gas(Red)

Sea-Dog Red Gas Deck Fill Replacement Cap – 1-1/4" NPSM (357015)

$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Item locally warehoused

The Sea-Dog 357015 Red Gas Deck Fill Replacement Cap is a color-coded replacement cap for Sea-Dog 357010 series gas deck fill fittings. The red cap...

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$15.29 - $15.29
$15.29
$15.29 - $15.29
$15.29
Replacment Cap For 351750

Sea-Dog Chrome-Plated Zinc Replacement Deck Fill Cap with Chain (351755)

$15.09 - $15.09
$15.09
$15.09 - $15.09
$15.09
Item locally warehoused

The Sea-Dog 351755 Replacement Deck Fill Cap is a die-cast zinc chrome-plated cap designed to replace a lost or worn cap on the Sea-Dog 351750 seri...

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$15.09 - $15.09
$15.09
$15.09 - $15.09
$15.09
SeaDog 351391 Angled Hose Deck Fill Replacement Cap

Sea-Dog 316 Stainless Angled Deck Fill Replacement Cap – 1-1/2" Hose (351391)

$48.59 - $48.59
$48.59
$48.59 - $48.59
$48.59
Item locally warehoused

The Sea-Dog 351391 Angled Deck Fill Replacement Cap is an investment-cast 316 stainless steel cap designed to replace a lost or worn cap on a compa...

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$48.59 - $48.59
$48.59
$48.59 - $48.59
$48.59
SeaDog Deck Step | Injection Molded Rubber & Stamped 304 Stainless

Sea-Dog Rubber-Lined Deck Step – 304 Stainless Steel Frame (3280131)

$57.19 - $57.19
$57.19
$57.19 - $57.19
$57.19
Item locally warehoused

The Sea-Dog 3280131 Deck Step is a flush-mount boarding step designed for installation on boat transoms, swim platforms, and hull sides. The inject...

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$57.19 - $57.19
$57.19
$57.19 - $57.19
$57.19
Sea-Dog 0812521 Tie Down Eye Straps, Chrome/Brass, 1 pr.

Sea-Dog Tie Down Eye Straps – Chrome/Brass (Pair)

$18.79 - $18.79
$18.79
$18.79 - $18.79
$18.79
Item locally warehoused

Sea-Dog Tie Down Eye Straps – Chrome/Brass (Pair)A versatile and durable tie-down solution for securing gear aboard. These chrome-plated forged bro...

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$18.79 - $18.79
$18.79
$18.79 - $18.79
$18.79