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

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

$64.69 - $64.69
$64.69
$64.69 - $64.69
$64.69

18-8 Stainless Steel.

$64.69 - $64.69
$64.69
$64.69 - $64.69
$64.69
Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 3/8-16 X 3/4 In., Pack of 25

Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 3/8-16 X 3/4 In., Pack of 25

$87.99 - $87.99
$87.99
$87.99 - $87.99
$87.99

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

View full details
$87.99 - $87.99
$87.99
$87.99 - $87.99
$87.99
Phillips Machine Screw - Pan Head. 8-32 x 1-1/2"

Phillips Machine Screw - Pan Head. 8-32 x 1-1/2"

$61.09 - $61.09
$61.09
$61.09 - $61.09
$61.09

18-8 Stainless Steel.

$61.09 - $61.09
$61.09
$61.09 - $61.09
$61.09
Phillips Machine Screw - Pan Head. 1/4"-20 x 1"

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

$88.59 - $88.59
$88.59
$88.59 - $88.59
$88.59

18-8 Stainless Steel.

$88.59 - $88.59
$88.59
$88.59 - $88.59
$88.59
Phillips Machine Screw - Pan Head. 1/4"-20 x 2"

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

$82.29 - $82.29
$82.29
$82.29 - $82.29
$82.29

18-8 Stainless Steel.

$82.29 - $82.29
$82.29
$82.29 - $82.29
$82.29
Phillips Machine Screw - Pan Head. 1/4"-20 x 1-1/2"

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

$59.49 - $59.49
$59.49
$59.49 - $59.49
$59.49

18-8 Stainless Steel.

$59.49 - $59.49
$59.49
$59.49 - $59.49
$59.49
Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 8-32 X 3/8 In., Pack of 25

Seachoice 18-8 Stainless Steel Phillips Barrel Nuts w/ Truss Head, 8-32 X 3/8 In., Pack of 25

$96.69 - $96.69
$96.69
$96.69 - $96.69
$96.69

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

View full details
$96.69 - $96.69
$96.69
$96.69 - $96.69
$96.69
Phillips Machine Screw - Pan Head. 8-32 x 1/2"

Phillips Machine Screw - Pan Head. 8-32 x 1/2"

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31

18-8 Stainless Steel.

$31.31 - $31.31
$31.31
$31.31 - $31.31
$31.31
Phillips Machine Screw - Pan Head. 8-32 x 1"

Phillips Machine Screw - Pan Head. 8-32 x 1"

$41.99 - $41.99
$41.99
$41.99 - $41.99
$41.99

18-8 Stainless Steel.

$41.99 - $41.99
$41.99
$41.99 - $41.99
$41.99
Phillips Machine Screw - Flat Head, 3/8"-16 x 4"

Phillips Machine Screw - Flat Head, 3/8"-16 x 4"

$91.79 - $91.79
$91.79
$91.79 - $91.79
$91.79

18-8 Stainless Steel.

$91.79 - $91.79
$91.79
$91.79 - $91.79
$91.79
Phillips Machine Screw - Pan Head. 8-32 x 3/4"

Phillips Machine Screw - Pan Head. 8-32 x 3/4"

$43.49 - $43.49
$43.49
$43.49 - $43.49
$43.49

18-8 Stainless Steel.

$43.49 - $43.49
$43.49
$43.49 - $43.49
$43.49
Phillips Machine Screw - Truss Head 1/4-20 x 2"

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

$231.89 - $231.89
$231.89
$231.89 - $231.89
$231.89

18-8 Stainless Steel.

$231.89 - $231.89
$231.89
$231.89 - $231.89
$231.89
Cap Screw - Hex Head, 7/16"-14 x 3"

Cap Screw - Hex Head, 7/16"-14 x 3"

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

18-8 Stainless Steel.

$65.49 - $65.49
$65.49
$65.49 - $65.49
$65.49
Phillips Machine Screw - Flat Head, 10-24 x 1"

Phillips Machine Screw - Flat Head, 10-24 x 1"

$54.29 - $54.29
$54.29
$54.29 - $54.29
$54.29

18-8 Stainless Steel.

$54.29 - $54.29
$54.29
$54.29 - $54.29
$54.29
Lag Screw, 3/8 x 1"

Lag Screw, 3/8 x 1"

$64.49 - $64.49
$64.49
$64.49 - $64.49
$64.49

18-8 Stainless Steel.

$64.49 - $64.49
$64.49
$64.49 - $64.49
$64.49
Lag Screw, 3/8 x 2"

Lag Screw, 3/8 x 2"

$103.59 - $103.59
$103.59
$103.59 - $103.59
$103.59

18-8 Stainless Steel.

$103.59 - $103.59
$103.59
$103.59 - $103.59
$103.59
Lag Screw, 3/8 x 1-1/2"

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

$52.19 - $52.19
$52.19
$52.19 - $52.19
$52.19

18-8 Stainless Steel.

$52.19 - $52.19
$52.19
$52.19 - $52.19
$52.19
Phillips Machine Screw - Flat Head, 10-24 x 3/4"

Phillips Machine Screw - Flat Head, 10-24 x 3/4"

$36.39 - $36.39
$36.39
$36.39 - $36.39
$36.39

18-8 Stainless Steel.

$36.39 - $36.39
$36.39
$36.39 - $36.39
$36.39
Phillips Machine Screw - Flat Head, 10-24 x 1/2"

Phillips Machine Screw - Flat Head, 10-24 x 1/2"

$34.49 - $34.49
$34.49
$34.49 - $34.49
$34.49

18-8 Stainless Steel.

$34.49 - $34.49
$34.49
$34.49 - $34.49
$34.49
Cap Screw - Hex Head, 7/16"-14 x 2"

Cap Screw - Hex Head, 7/16"-14 x 2"

$74.19 - $74.19
$74.19
$74.19 - $74.19
$74.19

18-8 Stainless Steel.

$74.19 - $74.19
$74.19
$74.19 - $74.19
$74.19
Cap Screw - Hex Head, 1/4"-20 x 2-1/2"

Cap Screw - Hex Head, 1/4"-20 x 2-1/2"

$39.99 - $39.99
$39.99
$39.99 - $39.99
$39.99

18-8 Stainless Steel.

$39.99 - $39.99
$39.99
$39.99 - $39.99
$39.99
Cap Screw - Hex Head, 1/4"-20 x 3"

Cap Screw - Hex Head, 1/4"-20 x 3"

$63.79 - $63.79
$63.79
$63.79 - $63.79
$63.79

18-8 Stainless Steel.

$63.79 - $63.79
$63.79
$63.79 - $63.79
$63.79
Cap Screw - Hex Head, 1/4"-20 x 1-1/2"

Cap Screw - Hex Head, 1/4"-20 x 1-1/2"

$59.29 - $59.29
$59.29
$59.29 - $59.29
$59.29

18-8 Stainless Steel.

$59.29 - $59.29
$59.29
$59.29 - $59.29
$59.29
Cap Screw - Hex Head, 7/16"-14 x 2-1/2"

Cap Screw - Hex Head, 7/16"-14 x 2-1/2"

$75.39 - $75.39
$75.39
$75.39 - $75.39
$75.39

18-8 Stainless Steel.

$75.39 - $75.39
$75.39
$75.39 - $75.39
$75.39
Cap Screw - Hex Head, 1/4"-20 x 2"

Cap Screw - Hex Head, 1/4"-20 x 2"

$95.29 - $95.29
$95.29
$95.29 - $95.29
$95.29

18-8 Stainless Steel.

$95.29 - $95.29
$95.29
$95.29 - $95.29
$95.29
Lag Screw, 5/16 x 2-1/2"

Lag Screw, 5/16 x 2-1/2"

$23.19 - $23.19
$23.19
$23.19 - $23.19
$23.19

18-8 Stainless Steel.

$23.19 - $23.19
$23.19
$23.19 - $23.19
$23.19
Cap Screw - Hex Head, 1/4-20 x 1"

Cap Screw - Hex Head, 1/4-20 x 1"

$100.79 - $100.79
$100.79
$100.79 - $100.79
$100.79

18-8 Stainless Steel.

$100.79 - $100.79
$100.79
$100.79 - $100.79
$100.79
Cap Screw - Hex Head, 7/16"-14 x 1"

Cap Screw - Hex Head, 7/16"-14 x 1"

$38.79 - $38.79
$38.79
$38.79 - $38.79
$38.79

18-8 Stainless Steel.

$38.79 - $38.79
$38.79
$38.79 - $38.79
$38.79
Cap Screw - Hex Head, 7/16"-14 x 1-1/2"

Cap Screw - Hex Head, 7/16"-14 x 1-1/2"

$44.79 - $44.79
$44.79
$44.79 - $44.79
$44.79

18-8 Stainless Steel.

$44.79 - $44.79
$44.79
$44.79 - $44.79
$44.79
Cap Screw - Hex Head, 7/16"-14 x 1-1/4"

Cap Screw - Hex Head, 7/16"-14 x 1-1/4"

$36.19 - $36.19
$36.19
$36.19 - $36.19
$36.19

18-8 Stainless Steel.

$36.19 - $36.19
$36.19
$36.19 - $36.19
$36.19
Phillips Machine Screw - Flat Head, 8-32 x 1-1/2"

Phillips Machine Screw - Flat Head, 8-32 x 1-1/2"

$61.89 - $61.89
$61.89
$61.89 - $61.89
$61.89

18-8 Stainless Steel.

$61.89 - $61.89
$61.89
$61.89 - $61.89
$61.89
Cap Screw - Hex Head, 1/4"-20 x 1-1/4"

Cap Screw - Hex Head, 1/4"-20 x 1-1/4"

$50.99 - $50.99
$50.99
$50.99 - $50.99
$50.99

18-8 Stainless Steel.

$50.99 - $50.99
$50.99
$50.99 - $50.99
$50.99
Lag Screw, 5/16 x 3"

Lag Screw, 5/16 x 3"

$33.79 - $33.79
$33.79
$33.79 - $33.79
$33.79

18-8 Stainless Steel.

$33.79 - $33.79
$33.79
$33.79 - $33.79
$33.79
Lag Screw, 5/16 x 2"

Lag Screw, 5/16 x 2"

$60.59 - $60.59
$60.59
$60.59 - $60.59
$60.59

18-8 Stainless Steel.

$60.59 - $60.59
$60.59
$60.59 - $60.59
$60.59
Carriage Bolt, 1/4"-20 x 2-1/2"

Carriage Bolt, 1/4"-20 x 2-1/2"

$49.99 - $49.99
$49.99
$49.99 - $49.99
$49.99

18-8 Stainless Steel.

$49.99 - $49.99
$49.99
$49.99 - $49.99
$49.99
Lag Screw, 5/16 x 1-1/2"

Lag Screw, 5/16 x 1-1/2"

$38.69 - $38.69
$38.69
$38.69 - $38.69
$38.69

18-8 Stainless Steel.

$38.69 - $38.69
$38.69
$38.69 - $38.69
$38.69
Lag Screw, 5/16 x 1"

Lag Screw, 5/16 x 1"

$38.29 - $38.29
$38.29
$38.29 - $38.29
$38.29

18-8 Stainless Steel.

$38.29 - $38.29
$38.29
$38.29 - $38.29
$38.29
Cap Screw - Hex Head, 3/8"-16 x 6"

Cap Screw - Hex Head, 3/8"-16 x 6"

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

18-8 Stainless Steel.

$56.69 - $56.69
$56.69
$56.69 - $56.69
$56.69
Cap Screw - Hex Head, 1/4-20 x 5/8"

Cap Screw - Hex Head, 1/4-20 x 5/8"

$68.59 - $68.59
$68.59
$68.59 - $68.59
$68.59

18-8 Stainless Steel.

$68.59 - $68.59
$68.59
$68.59 - $68.59
$68.59
Cap Screw - Hex Head, 1/4-20 x 1/2"

Cap Screw - Hex Head, 1/4-20 x 1/2"

$79.01 - $79.01
$79.01
$79.01 - $79.01
$79.01

18-8 Stainless Steel.

$79.01 - $79.01
$79.01
$79.01 - $79.01
$79.01
Cap Screw - Hex Head, 1/4-20 x 3/4"

Cap Screw - Hex Head, 1/4-20 x 3/4"

$67.19 - $67.19
$67.19
$67.19 - $67.19
$67.19

18-8 Stainless Steel.

$67.19 - $67.19
$67.19
$67.19 - $67.19
$67.19
Cap Screw - Hex Head, 3/8"-16 x 5"

Cap Screw - Hex Head, 3/8"-16 x 5"

$55.59 - $55.59
$55.59
$55.59 - $55.59
$55.59

18-8 Stainless Steel.

$55.59 - $55.59
$55.59
$55.59 - $55.59
$55.59
Phillips Machine Screw - Flat Head, 8-32 x 1"

Phillips Machine Screw - Flat Head, 8-32 x 1"

$39.49 - $39.49
$39.49
$39.49 - $39.49
$39.49

18-8 Stainless Steel.

$39.49 - $39.49
$39.49
$39.49 - $39.49
$39.49
Phillips Tapping Screws - Oval Head, #14 x 1-1/2"

Phillips Tapping Screws - Oval Head, #14 x 1-1/2"

$62.99 - $62.99
$62.99
$62.99 - $62.99
$62.99

18-8 Stainless Steel.

$62.99 - $62.99
$62.99
$62.99 - $62.99
$62.99
Cap Screw - Hex Head, 3/8"-16 x 4-1/2"

Cap Screw - Hex Head, 3/8"-16 x 4-1/2"

$40.79 - $40.79
$40.79
$40.79 - $40.79
$40.79

18-8 Stainless Steel.

$40.79 - $40.79
$40.79
$40.79 - $40.79
$40.79

Volvo Penta - Lock Washer - 861652

$0.00 - $0.00
$0.00
$39.50
$39.50 - $39.50
$39.50
Only 1 left!

The Volvo Penta 861652 is a genuine OEM lock washer used in the cooling system assembly on select Volvo Penta KAD-series marine diesel engines. Thi...

View full details
$0.00 - $0.00
$0.00
$39.50
$39.50 - $39.50
$39.50

Volvo Penta - Mounting Stud 103mm - 853982

$0.00 - $0.00
$0.00
$46.40
$46.40 - $46.40
$46.40
Only 3 left!

The Volvo Penta 853982 is a genuine OEM threaded mounting stud used as a structural engine fastener on select Volvo Penta gasoline and diesel marin...

View full details
$0.00 - $0.00
$0.00
$46.40
$46.40 - $46.40
$46.40

N-10 Inch-Series Bearing Locknut 1.967"-18 TPI - N0-10

$0.00 - $0.00
$0.00
$10.75
$10.75 - $10.75
$10.75
in stock

The N0-10, also commonly written as N-10, is a standard inch-series bearing locknut used to secure rolling bearings, pulleys, gears, sleeves, and o...

View full details
$0.00 - $0.00
$0.00
$10.75
$10.75 - $10.75
$10.75