Skip to content
Celebrating over 50 years of Trusted Marine Service
Over 50 years of Trusted Marine Service

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

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
Item locally warehoused

Secure fastening made for marine use—this lag screw is hot dipped galvanized to help resist corrosion in wet environments. Key Features Hot dipped...

View full details
$99.89 - $99.89
$99.89
$99.89 - $99.89
$99.89
Fasteners Only (Boxed)

Fasteners Only (Boxed)

$20,452.79 - $20,452.79
$20,452.79
$20,452.79 - $20,452.79
$20,452.79
Item locally warehoused

Fasteners Only (Boxed) — bulk fasteners boxed for convenient storage and use in mounting projects.Ideal for general hardware installations and main...

View full details
$20,452.79 - $20,452.79
$20,452.79
$20,452.79 - $20,452.79
$20,452.79
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
Item locally warehoused

Secure and protect your 1/2-13 threaded connections with this Seachoice hex nut finished in hot dipped galvanized coating for corrosion resistance....

View full details
$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
Item locally warehoused

Flat Washer sized for 5/16" hardware, 0.062" thick with a 7/8" outer diameter. Hot-dipped galvanized for corrosion resistance. Key Features Size: ...

View full details
$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
Item locally warehoused

The Seachoice 01531 hex nut (3/8-16) is a hot dipped galvanized fastener for secure fastening in marine and general-purpose hardware applications. ...

View full details
$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
Item locally warehoused

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
Item locally warehoused

Use this M12 flat washer to spread clamping load and help create a reliable bearing surface in stainless hardware assemblies. Key Features Flat wa...

View full details
$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
Item locally warehoused

Secure wood-to-wood or wood-to-structure connections with this hot-dipped galvanized lag screw. Designed for strength and long-lasting corrosion re...

View full details
$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
Item locally warehoused

A flat washer made for M10 hardware, sized 2 mm thick with a 20 mm outer diameter for reliable load distribution and vibration resistance in marine...

View full details
$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
Item locally warehoused

A Seachoice 18-8 stainless steel flat washer sized for M8 (M8M8), with a 16 mm outer diameter and 1.6 mm thickness—ideal for spreading fastener loa...

View full details
$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
Item locally warehoused

Use this M5 flat washer to help distribute load and provide a secure bearing surface under metric screw heads or nuts during assembly. Sized for an...

View full details
$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
Item locally warehoused

A corrosion-resistant flat washer made for M4 hardware, sized to help spread load and improve clamping performance. Key Features Designed as a fla...

View full details
$56.09 - $56.09
$56.09
$56.09 - $56.09
$56.09
Nylon Insert Locknut - Stainless M6-1

Nylon Insert Locknut - Stainless M6-1

$111.89 - $111.89
$111.89
$111.89 - $111.89
$111.89
Item locally warehoused

A corrosion-resistant nylon insert locknut designed for vibration-prone marine hardware—ideal for helping keep stainless fasteners securely tighten...

View full details
$111.89 - $111.89
$111.89
$111.89 - $111.89
$111.89
Nylon Insert Locknut - Stainless M5-.8

Nylon Insert Locknut - Stainless M5-.8

$40.99 - $40.99
$40.99
$40.99 - $40.99
$40.99
Item locally warehoused

18-8 Stainless Steel.

$40.99 - $40.99
$40.99
$40.99 - $40.99
$40.99
Nylon Insert Locknut - Stainless M12-1.75

Nylon Insert Locknut - Stainless M12-1.75

$49.89 - $49.89
$49.89
$49.89 - $49.89
$49.89
Item locally warehoused

Secure and corrosion-resistant fastening for vibration-prone marine and hardware applications—this nylon insert locknut features a stainless steel ...

View full details
$49.89 - $49.89
$49.89
$49.89 - $49.89
$49.89
Flat Washer, M6, 1.6 mm Thick, OD 12 mm

Flat Washer, M6, 1.6 mm Thick, OD 12 mm

$18.39 - $18.39
$18.39
$18.39 - $18.39
$18.39
Item locally warehoused

Flat washer sized for M6 hardware. Built from 18-8 stainless steel to help resist corrosion in marine and outdoor applications. Key Features M6 si...

View full details
$18.39 - $18.39
$18.39
$18.39 - $18.39
$18.39
Nylon Insert Locknut - Stainless M8-1.25

Nylon Insert Locknut - Stainless M8-1.25

$46.49 - $46.49
$46.49
$46.49 - $46.49
$46.49
Item locally warehoused

18-8 Stainless Steel.

$46.49 - $46.49
$46.49
$46.49 - $46.49
$46.49
Hex Nut M10-1.5

Hex Nut M10-1.5

$27.19 - $27.19
$27.19
$27.19 - $27.19
$27.19
Item locally warehoused

A Seachoice hex nut sized for metric M10-1.5 threads, made from 18-8 stainless steel for corrosion-resistant fastening in marine and outdoor applic...

View full details
$27.19 - $27.19
$27.19
$27.19 - $27.19
$27.19
Hex Nut M5-.8

Hex Nut M5-.8

$55.39 - $55.39
$55.39
$55.39 - $55.39
$55.39
Item locally warehoused

Secure threaded connections with the Seachoice hex nut for M5-.8 hardware. Made from 18-8 stainless steel for solid corrosion resistance in marine ...

View full details
$55.39 - $55.39
$55.39
$55.39 - $55.39
$55.39
Square Tapping Screw - Pan Head, #10 x 1-1/2"

Square Tapping Screw - Pan Head, #10 x 1-1/2"

$84.19 - $84.19
$84.19
$84.19 - $84.19
$84.19
Item locally warehoused

A durable #10 x 1-1/2" square tapping screw with a pan head for secure fastening in marine and general hardware applications. Key Features Square ...

View full details
$84.19 - $84.19
$84.19
$84.19 - $84.19
$84.19
Hex Nut M4-.7

Hex Nut M4-.7

$22.19 - $22.19
$22.19
$22.19 - $22.19
$22.19
Item locally warehoused

Secure and tighten metric connections with the Seachoice hex nut in M4-.7 thread size. Made from 18-8 stainless steel for solid corrosion resistanc...

View full details
$22.19 - $22.19
$22.19
$22.19 - $22.19
$22.19
Nylon Insert Locknut - Stainless M10-1.5

Nylon Insert Locknut - Stainless M10-1.5

$63.19 - $63.19
$63.19
$63.19 - $63.19
$63.19
Item locally warehoused

18-8 Stainless Steel.

$63.19 - $63.19
$63.19
$63.19 - $63.19
$63.19
Hex Nut M6-1

Hex Nut M6-1

$24.79 - $24.79
$24.79
$24.79 - $24.79
$24.79
Item locally warehoused

Hex Nut M6-1 is a metric hex nut made from 18-8 stainless steel for secure fastening in marine and general hardware applications. Key Features Met...

View full details
$24.79 - $24.79
$24.79
$24.79 - $24.79
$24.79
Lock Washer, M10

Lock Washer, M10

$24.89 - $24.89
$24.89
$24.89 - $24.89
$24.89
Item locally warehoused

18-8 Stainless Steel.

$24.89 - $24.89
$24.89
$24.89 - $24.89
$24.89
Lock Washer, M8

Lock Washer, M8

$27.89 - $27.89
$27.89
$27.89 - $27.89
$27.89
Item locally warehoused

A metric M8 lock washer made from 18-8 stainless steel for helping resist loosening on properly matched fasteners. Key Features Metric M8 size loc...

View full details
$27.89 - $27.89
$27.89
$27.89 - $27.89
$27.89
Nylon Insert Locknut - Stainless M4-.7

Nylon Insert Locknut - Stainless M4-.7

$65.29 - $65.29
$65.29
$65.29 - $65.29
$65.29
Item locally warehoused

Secure threaded connections with this stainless nylon insert locknut. The nylon collar helps resist loosening from vibration—ideal for marine and e...

View full details
$65.29 - $65.29
$65.29
$65.29 - $65.29
$65.29
Square Tapping Screw - Pan Head, #10 x 1"

Square Tapping Screw - Pan Head, #10 x 1"

$31.49 - $31.49
$31.49
$31.49 - $31.49
$31.49
Item locally warehoused

Square tapping screw designed for secure fastening in applications that use a square-drive pan head. Sized #10 x 1" and made from 18-8 stainless st...

View full details
$31.49 - $31.49
$31.49
$31.49 - $31.49
$31.49
Lock Washer, M12

Lock Washer, M12

$68.69 - $68.69
$68.69
$68.69 - $68.69
$68.69
Item locally warehoused

Keep fasteners snug and help resist loosening with a SeaChoice-style M12 lock washer in 18-8 stainless steel. Key Features M12 size for metric har...

View full details
$68.69 - $68.69
$68.69
$68.69 - $68.69
$68.69
Hex Nut M8-1.25

Hex Nut M8-1.25

$34.39 - $34.39
$34.39
$34.39 - $34.39
$34.39
Item locally warehoused

Secure and finish metric fastener connections with this Seachoice Hex Nut M8-1.25. Made for corrosion resistance, it’s a practical choice for marin...

View full details
$34.39 - $34.39
$34.39
$34.39 - $34.39
$34.39
Lock Washer, M6

Lock Washer, M6

$17.59 - $17.59
$17.59
$17.59 - $17.59
$17.59
Item locally warehoused

18-8 Stainless Steel.

$17.59 - $17.59
$17.59
$17.59 - $17.59
$17.59
Square Tapping Screw - Pan Head, #10 x 3/4"

Square Tapping Screw - Pan Head, #10 x 3/4"

$32.69 - $32.69
$32.69
$32.69 - $32.69
$32.69
Item locally warehoused

A durable square-drive tapping screw sized for marine and general hardware fastening tasks. This pan head screw is made from 18-8 stainless steel f...

View full details
$32.69 - $32.69
$32.69
$32.69 - $32.69
$32.69
Phillips Self Drilling Screw - Pan Head #8 x 1"

Phillips Self Drilling Screw - Pan Head #8 x 1"

$26.19 - $26.19
$26.19
$26.19 - $26.19
$26.19
Item locally warehoused

A Phillips self-drilling pan head screw in 410 stainless steel, sized #8 x 1" for applications that benefit from corrosion-resistant fastening and ...

View full details
$26.19 - $26.19
$26.19
$26.19 - $26.19
$26.19
Square Tapping Screw - Pan Head, #8 x 1"

Square Tapping Screw - Pan Head, #8 x 1"

$35.99 - $35.99
$35.99
$35.99 - $35.99
$35.99
Item locally warehoused

Keep projects secure with this square tapping screw—built for reliable fastening in marine and other corrosion-prone environments. Key Features Sq...

View full details
$35.99 - $35.99
$35.99
$35.99 - $35.99
$35.99
Square Tapping Screw - Pan Head, #8 x 3/4"

Square Tapping Screw - Pan Head, #8 x 3/4"

$30.49 - $30.49
$30.49
$30.49 - $30.49
$30.49
Item locally warehoused

A #8 x 3/4" square drive pan head tapping screw made from 18-8 stainless steel for marine hardware and general fastening applications. Key Features...

View full details
$30.49 - $30.49
$30.49
$30.49 - $30.49
$30.49
Phillips Tapping Screw - Truss Head #10 x 1-1/2"

Phillips Tapping Screw - Truss Head #10 x 1-1/2"

$88.09 - $88.09
$88.09
$88.09 - $88.09
$88.09
Item locally warehoused

Secure marine and general fastening tasks with this Seachoice Phillips tapping screw featuring a truss head and #10 size for a 1-1/2" length. Built...

View full details
$88.09 - $88.09
$88.09
$88.09 - $88.09
$88.09
Flat Washer, 3/4", .109" Thick, OD 1-5/16" (A/N Style)

Flat Washer, 3/4", .109" Thick, OD 1-5/16" (A/N Style)

$98.99 - $98.99
$98.99
$98.99 - $98.99
$98.99
Item locally warehoused

This flat washer from SEACHOICE is a 3/4" size, .109" thick stainless washer with an outside diameter (OD) of 1-5/16" in the A/N style. Designed to...

View full details
$98.99 - $98.99
$98.99
$98.99 - $98.99
$98.99
Flat Washer, 5/8", .078" Thick, OD 1-3/16" (A/N Style)

Flat Washer, 5/8", .078" Thick, OD 1-3/16" (A/N Style)

$40.09 - $40.09
$40.09
$40.09 - $40.09
$40.09
Item locally warehoused

A Seachoice 18-8 stainless flat washer designed for corrosion-resistant, secure clamping on marine hardware assemblies. This A/N style washer featu...

View full details
$40.09 - $40.09
$40.09
$40.09 - $40.09
$40.09
Flat Washer, 7/16", .062" Thick, OD 3/4" (A/N Style)

Flat Washer, 7/16", .062" Thick, OD 3/4" (A/N Style)

$7.89 - $7.89
$7.89
$7.89 - $7.89
$7.89
Item locally warehoused

A/N style 18-8 stainless steel flat washer sized for 7/16" applications—7/16" (screw size), .062" thick, with a 3/4" outside diameter (OD). Key Fea...

View full details
$7.89 - $7.89
$7.89
$7.89 - $7.89
$7.89
Phillips Tapping Screw - Truss Head #10 x 3/4"

Phillips Tapping Screw - Truss Head #10 x 3/4"

$44.89 - $44.89
$44.89
$44.89 - $44.89
$44.89
Item locally warehoused

Replace or stock marine fasteners with this Seachoice Phillips tapping screw featuring a truss head and #10 thread size. Key Features Phillips dri...

View full details
$44.89 - $44.89
$44.89
$44.89 - $44.89
$44.89
Phillips Self Drilling Screw - Pan Head #8 x 3/4"

Phillips Self Drilling Screw - Pan Head #8 x 3/4"

$30.19 - $30.19
$30.19
$30.19 - $30.19
$30.19
Item locally warehoused

Replace or stock up on corrosion-resistant fasteners with this Phillips self-drilling screw—pan head, #8 size, and 3/4" length—made from 410 stainl...

View full details
$30.19 - $30.19
$30.19
$30.19 - $30.19
$30.19
Flat Washer, 3/8", .062" Thick, OD 5/8" (A/N Style)

Flat Washer, 3/8", .062" Thick, OD 5/8" (A/N Style)

$17.29 - $17.29
$17.29
$17.29 - $17.29
$17.29
Item locally warehoused

A compact 3/8" bolt-size flat washer for spreading load under the fastener head or nut. Designed with a 5/8" outside diameter and a 0.062" thicknes...

View full details
$17.29 - $17.29
$17.29
$17.29 - $17.29
$17.29
Phillips Tapping Screw - Truss Head #8 x 1-1/2"

Phillips Tapping Screw - Truss Head #8 x 1-1/2"

$240.99 - $240.99
$240.99
$240.99 - $240.99
$240.99
Item locally warehoused

Secure fastening made for marine and general maintenance use—this Phillips tapping screw features a truss head and a #8 size with a 1-1/2" length. ...

View full details
$240.99 - $240.99
$240.99
$240.99 - $240.99
$240.99
Flat Washer, 1/2", .078" Thick, OD 7/8" (A/N Style)

Flat Washer, 1/2", .078" Thick, OD 7/8" (A/N Style)

$19.69 - $19.69
$19.69
$19.69 - $19.69
$19.69
Item locally warehoused

A durable 18-8 stainless steel flat washer sized for a 1/2" bolt with a .078" thickness and 7/8" outside diameter (A/N style). Key Features Made f...

View full details
$19.69 - $19.69
$19.69
$19.69 - $19.69
$19.69
Stainless Fender Washer 5/8", .109" Thick, OD 2"

Stainless Fender Washer 5/8", .109" Thick, OD 2"

$55.59 - $55.59
$55.59
$55.59 - $55.59
$55.59
Item locally warehoused

A corrosion-resistant stainless fender washer made for wide load distribution on marine and general hardware fastening applications. Key Features ...

View full details
$55.59 - $55.59
$55.59
$55.59 - $55.59
$55.59
Phillips Tapping Screw - Truss Head #8 x 1-1/4"

Phillips Tapping Screw - Truss Head #8 x 1-1/4"

$73.99 - $73.99
$73.99
$73.99 - $73.99
$73.99
Item locally warehoused

Secure fastening made simple with this Phillips tapping screw featuring a truss head and an 18-8 stainless steel construction—ideal for marine hard...

View full details
$73.99 - $73.99
$73.99
$73.99 - $73.99
$73.99
Phillips Tapping Screw - Truss Head #10 x 1"

Phillips Tapping Screw - Truss Head #10 x 1"

$55.99 - $55.99
$55.99
$55.99 - $55.99
$55.99
Item locally warehoused

Phillips tapping screw with a truss head design in 18-8 stainless steel for secure fastening in marine and hardware applications. Size: #10 x 1". K...

View full details
$55.99 - $55.99
$55.99
$55.99 - $55.99
$55.99
Phillips Tapping Screw - Truss Head #10 x 1-1/4"

Phillips Tapping Screw - Truss Head #10 x 1-1/4"

$96.39 - $96.39
$96.39
$96.39 - $96.39
$96.39
Item locally warehoused

Secure marine fastening made for wet-condition durability—this Seachoice Phillips tapping screw features a truss head design in 18-8 stainless stee...

View full details
$96.39 - $96.39
$96.39
$96.39 - $96.39
$96.39
Phillips Wood Screw - Flat Head, #10 x 2"

Phillips Wood Screw - Flat Head, #10 x 2"

$60.29 - $60.29
$60.29
$60.29 - $60.29
$60.29
Item locally warehoused

Phillips wood screw with a flat head for clean, countersunk installation in wood projects—made from 18-8 stainless steel for corrosion resistance. ...

View full details
$60.29 - $60.29
$60.29
$60.29 - $60.29
$60.29