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.
Match metal grade, fastener size, thread type, backing support, bedding compound, and load direction before drilling into the boat.
Use marine-grade hardware and proper sealing practices. Confirm load ratings, material compatibility, corrosion risk, deck core protection, and manufacturer instructions before installation.
Popular Fastener & Mounting Searches
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.
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.
Stainless Fasteners
Screws, bolts, nuts, washers, threaded rod, lock nuts, and specialty head styles for marine repair and upgrades.
Mounting Hardware
Brackets, bases, pads, backing plates, antenna mounts, rod holder mounts, and accessory supports.
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.
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.
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.
Filters
LALIZAS Hatch Insect Screen - 26" x 26" x 17" (650 x 650 x 420 mm) Universal Fit
LALIZAS Universal Hatch Insect Screen - MediumUniversal-fit marine hatch insect screen by LALIZAS designed to keep insects out while allowing fresh...
View full detailsMercury MerCruiser - Pinion Nut - 11-35921
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...
View full detailsMercury MerCruiser Stud 898101943
OEM Stud for Mercury MerCruiser Marine Engines Genuine Mercury MerCruiser stud provides secure fastening for engine components, ensuring proper ass...
View full detailsVolvo Penta Throttle Body Nut 3862463 | Inlet & Exhaust Assembly OEM
Volvo Penta Throttle Body Nut – 3862463 Part Information Part Number: 3862463 Brand: Volvo Penta Official Product Type: Nut – Throttle Body / ...
View full detailsQuicksilver 5/16-24 UNF Nut 29250 | Mercury MerCruiser OEM Powerhead & Throttle Hardware
Quicksilver OEM 5/16-24 UNF Nut — Part No. 29250 / 11-29250 Part Number: 29250 Service Format: 11-29250 Supersedes: 20461 → 29250 (shift-actua...
View full detailsQuicksilver Gear Housing Vent Screw 28653 | #10-32 × 1/4 in. | Mercury MerCruiser OEM | Pack of 5
Quicksilver OEM Gear Housing Vent Screw — Part No. 28653 / 10-28653 Part Number: 28653 Service Format: 10-28653 Brand: Quicksilver (Genuine Me...
View full detailsQuicksilver 1/4 in. Retaining E-Ring 27290 | Mercury MerCruiser OEM | 6.35 mm
Quicksilver OEM 1/4 in. Retaining E-Ring — Part No. 27290 / 53-27290 Part Number: 27290 Service Format: 53-27290 Supersedes: 833249E → 27290 (...
View full detailsQuicksilver #10 Stainless Lock Washer 26996 | Mercury MerCruiser OEM | Pack of 15
Quicksilver OEM #10 Stainless Lock Washer — Part No. 26996 / 13-26996 Part Number: 26996 Service Format: 13-26996 Brand: Quicksilver (Genuine ...
View full detailsMercury Quicksilver Hex Head Cap Screw 10-34353 | 3/8"-16 x 1" OEM MerCruiser Fastener — Pack of 5
Mercury Quicksilver Hex Head Cap Screw 10-34353 — Pack of 5 Part Number: 10-34353 (short ref: 34353) Brand: Mercury / Quicksilver Product Type: He...
View full detailsQuicksilver Lockwasher 8M0204647 (.312 in.) | Mercury MerCruiser OEM Hardware
Quicksilver OEM Lockwasher — Part No. 8M0204647 Part Number: 8M0204647 Legacy Reference: 26993 Brand: Quicksilver (Genuine Mercury Marine OEM)...
View full detailsQuicksilver Cotter Pin 26953 | Mercury MerCruiser OEM Fastener
Quicksilver OEM Cotter Pin — Part No. 26953 Part Number: 26953 Brand: Quicksilver (Genuine Mercury Marine OEM) Type: Cotter Pin (single-use sa...
View full detailsVolvo Penta Steering Cylinder Linkage Pin 3859046
Volvo Penta OEM Steering Cylinder Linkage Pin – Part No. 3859046 Part Number 3859046 Brand Volvo Penta Component Type Steering Cylinde...
View full detailsVolvo Penta Split Pin 3859045
Volvo Penta OEM Split Pin – Part No. 3859045 Part Number 3859045 Brand Volvo Penta Component Type Split Pin (Cotter Pin) System St...
View full detailsVolvo Penta Heat Exchanger Cover Screw 3858994
Volvo Penta OEM Heat Exchanger Cover Screw – Part No. 3858994 Part Number 3858994 Brand Volvo Penta Component Type Heat Exchanger Cove...
View full detailsMercury MerCruiser Quicksilver Cotter Pin 34212 | Superseded to 54929
Mercury MerCruiser Quicksilver Cotter Pin 34212 | Superseded to 54929 Original Part Number: 34212 (service format: 18-34212) Current Replacement: ...
View full detailsMercury MerCruiser Quicksilver 5/16-24 Hex Nut 862902 | Replaces 25594
Part Details Part Number: 862902 Service Format: 11-862902 Brand: Mercury / Quicksilver Type: Hex nut — 5/16”-24 fine thread System: Sterndri...
View full detailsMercury Quicksilver OEM Nut 32219
Mercury Quicksilver OEM Nut 32219 Part Number: 32219 Brand: Mercury / Quicksilver Product Type: OEM Nut / Fastener Catalog Notation: @5 (sold indi...
View full detailsMercury MerCruiser Quicksilver 3/8-24 Hex Nut 46335
Part Details Part Number: 46335 Service Format: 11-46335 Brand: Mercury / Quicksilver Type: Hex nut — 3/8”-24 fine thread System: Exhaust, co...
View full detailsMercury MerCruiser Quicksilver Washer 24664 | Pack of 5 | OEM Hardware
Part Details Part Number: 24664 Service Format: 12-24664 Brand: Mercury / Quicksilver Type: Flat washer Pack Quantity: 5 washers System: Eng...
View full detailsMercury MerCruiser Quicksilver 1/4-28 Nut 24652 | Pack of 5
Part Details Part Number: 24652 Service Format: 11-24652 Brand: Mercury / Quicksilver Type: Hex nut — 1/4”-28 fine thread Pack Quantity: 5 nu...
View full detailsMercury MerCruiser Quicksilver 5/16 in. Washer 22753 | OEM Hardware
Part Details Part Number: 22753 Service Format: 12-22753 Brand: Mercury / Quicksilver Type: Flat washer — 5/16 in. System: Engine and drive h...
View full detailsMercury MerCruiser Quicksilver 5/8-18 Flywheel Nut 8M0214915
Part Details Part Number: 8M0214915 Service Format: 11-8M0214915 Brand: Mercury / Quicksilver Type: Flywheel retaining nut — 5/8”-18 thread S...
View full detailsMercury MerCruiser Quicksilver 7/16-14 Nut 22024 | OEM Hardware
Part Details Part Number: 22024 / 11-22024 Brand: Mercury / Quicksilver Type: Hex nut — 7/16”-14 thread System: Engine and accessory hardware ...
View full detailsMercury MerCruiser Gimbal Housing Washer 21900 | Alpha Bravo Sterndrive
Part Details Part Number: 21900 / 12-21900 Brand: Mercury / Quicksilver Type: Flat washer — gimbal housing bolt hardware System: Sterndrive tr...
View full detailsVolvo Penta Intake Manifold Bolt 3858961
Volvo Penta OEM Intake Manifold Bolt – Part No. 3858961 Part Number 3858961 Brand Volvo Penta Component Type Intake Manifold Retaining...
View full detailsVolvo Penta Non-Setting Sealant — 1161099, 125 mL
Volvo Penta Non-Setting Sealant — Part #1161099, 125 mL Genuine Volvo Penta non-setting sealing compound, part number 1161099, supplied in a 125 m...
View full detailsVolvo Penta Hexagon Screw 192548 | OEM Marine Fastener – 7 Pack
Volvo Penta 192548 – Hexagon Screw (7 Pack) Part Number: 192548 | Brand: Volvo Penta | Type: OEM Hexagon Screw | Sold: 7 per pack This is t...
View full detailsVolvo Penta Washer 191169 | OEM Marine Fastener Hardware
Volvo Penta 191169 – Washer Part Number: 191169 | Brand: Volvo Penta | Type: OEM Washer | Sold: Individually This is the genuine OEM washer...
View full detailsVolvo Penta Crankshaft Damper Pulley Nut | OEM 3531111
Volvo Penta OEM Crankshaft Damper Pulley Nut — Part No. 3531111 Part Number: 3531111 Brand: Volvo Penta Official Product Type: Engine Hardware &am...
View full detailsMercury MerCruiser Quicksilver Screw 10-55300 (5/16"-18 × 5.250")
Mercury Quicksilver Screw 10-55300 – 5/16”-18 × 5.250” This is a genuine OEM Mercury Marine / Quicksilver structural screw used in MerCruiser engi...
View full detailsMercury MerCruiser Stainless Steel Nut 11-82671013 | 3/8"-24 Fine Thread
Mercury MerCruiser Stainless Steel Nut — Part No. 11-82671013 This is the genuine Mercury Marine OEM stainless steel nut listed under part number 1...
View full detailsMercury MerCruiser Stainless Steel Washer 12-34931 | 0.406" x 0.734" x 0.063"
Mercury MerCruiser Stainless Steel Washer — Part No. 12-34931 This is the genuine Mercury Marine OEM stainless steel washer listed under part numbe...
View full detailsMercury MerCruiser Quicksilver Washer Assembly 12-55073A2
Mercury Quicksilver Washer Assembly – Part No. 12-55073A2 This is a genuine OEM Mercury Marine / Quicksilver washer assembly used in MerCruiser en...
View full detailsMercury MerCruiser OEM Plate | 8M0075813
Mercury MerCruiser OEM Plate | Part 8M0075813 Part Number: 8M0075813 Brand: Mercury Marine / Quicksilver Official Product Type: Plate Category: Ha...
View full detailsMercury MerCruiser Quicksilver Screw 10-53576 (Pack of 5)
Mercury Quicksilver Screw 10-53576 – Pack of 5 This is a genuine OEM Mercury Marine / Quicksilver screw sold in a convenient 5-pack. Used as a fas...
View full detailsMercury MerCruiser Lower Swivel Pin | 8M0073409
Mercury MerCruiser Lower Swivel Pin | Part 8M0073409 Part Number: 8M0073409 Full Part Reference: 17-8M0073409 Brand: Mercury Marine / Quicksilver ...
View full detailsDavis Universal Masthead Mount for WindTrak 10" & 15" | 1705
The Davis Universal Masthead Mount (1705) is designed to position your WindTrak wind vane clear of the obstructions that crowd most mastheads — run...
View full detailsForespar Lanocote Corrosion Guard – 4 oz. Jar | 770001
Forespar Lanocote is a lanolin-based corrosion guard paste that stops rust, oxidation, and electrolysis before they start — and halts them where th...
View full detailsForespar Twist-Lock Tiller Extension | 104017
The Forespar Twist-Lock Tiller Extension (104017) delivers reliable, full-reach helm control for sailors who need to steer from anywhere in the coc...
View full detailsForespar Twist-Lock Tiller Extension – 108" | 104016
The Forespar Twist-Lock Tiller Extension gives you full control of the helm from anywhere in the cockpit — whether you're hiking out, trimming sail...
View full detailsLewmar 60mm Synchro Single Block with Becket – Black | 29926004
The Lewmar 60mm Synchro Single Block with Becket is a precision-engineered sailing block designed for smooth, low-friction line handling in perform...
View full detailsLewmar 60mm Synchro Triple Block – Black | 29926003
The Lewmar 60mm Synchro Triple Block is a high-performance sailing block engineered for demanding on-water applications where low friction, smooth ...
View full detailsSea-Dog 3/8" Nylon Fairlead | 354-082010
Sea-Dog 3/8" Nylon Fairlead | 354-082010A compact, no-fuss fairlead for routing smaller control lines cleanly through the deck. Injection-molded ny...
View full detailsSea-Dog 5/8" Nylon Fairlead | 354-082016
Sea-Dog 5/8" Nylon Fairlead | 354-082016A clean, low-profile fairlead for routing control lines straight through the deck. Injection-molded nylon k...
View full detailsSea-Dog 1/2" Nylon Fairlead | 354-082051
Sea-Dog 1/2" Nylon Fairlead | 354-082051A simple, reliable fairlead for routing control lines cleanly through the deck. Injection-molded nylon keep...
View full detailsSea-Dog Nylon Fairlead with Stainless Insert | 354-082615
Sea-Dog Nylon Fairlead with Stainless Insert | 354-082615A tough, low-profile fairlead built for control lines and light rigging on sailboats and p...
View full detailsMercury MerCruiser Hex Screw 10-34500 | 5/16"-18 x 5/8" OEM Fastener
Mercury MerCruiser Hex Screw — Part No. 10-34500 This is the genuine Mercury Marine OEM hex screw listed under part number 10-34500 (base number 34...
View full detailsQuicksilver Washer 29245 | Mercury MerCruiser OEM Hardware
Quicksilver OEM Washer — Part No. 29245 Part Number: 29245 Current Superseding Number: 8M0204649 Brand: Quicksilver (Genuine Mercury Marine OE...
View full details