Marine Hardware

Heavy-Duty Marine Hardware: Custom Investment Castings & Structural Fittings

Engineered for extreme marine environments, our stainless steel and bronze marine hardware components deliver structural integrity, dimensional precision, and proven saltwater corrosion resistance. Built for commercial shipbuilders, boat manufacturers, and global marine distributors.

Stainless Steel Thru Hull Sleeve
Process: Silica Sol Investment Casting + Precision CNC
Material: SS316 / SS316L / CF8M
Surface Finish: Fine Machined & Brushed
Design Type: Short Threaded Sleeve with Base Flange
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Stainless Steel Thru Hull Fitting
Process: Silica Sol Investment Casting + Precision CNC
Material: SS316 / SS316L / CF8M
Surface Finish: Fine Machined & Brushed
Component Type: Threaded Bulkhead Connector with...
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Stainless Steel Thru Hull Barb
Process: Silica Sol Investment Casting + Precision CNC
Material: SS316 / SS316L / CF8M
Surface Finish: Fine Machined & Sandblasted
Component Type: Threaded Bulkhead Skin Fitting...
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Stainless Steel Swivel Deck Hinge
Process: Silica Sol Investment Casting + Multi-Axis CNC + Assembly
Material: SS316 / SS304 / CF8M
Surface Finish: Machined & Fine Polished
Feature Tech: Quick Release Pin with...
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Stainless Steel Round Glass Spigot
Process: Silica Sol Investment Casting
Material: SS316 / SS304 / Duplex 2205
Surface Finish: High Mirror Polished
Base Shape: Round Flange Base with Holes
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Stainless Steel Split Shaft Collar
Process: Silica Sol Investment Casting + CNC Machining
Material: SS316 / SS304 / CF8M
Surface Finish: Smooth Polished / Fine Satin Finish
Design Type: Two-Piece Split Clamping Ring
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Stainless Steel Rigging Hardware Kit
Process: Silica Sol Investment Casting + Precision CNC + Polishing
Material: SS316 / SS304 / CF8M
Surface Finish: High Polished / Barrel Tumbled
Included Hardware: Turnbuckles,...
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Stainless Steel Marine Water Cap
Process: Silica Sol Investment Casting + CNC Tapping
Material: SS316 / SS316L / CF8M
Surface Finish: High Mirror Polished Face
Label Mark: Embossed "WATER" with Wave Logo
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Stainless Steel Marine Rope Cleat
Process: Silica Sol Investment Casting
Material: SS316 / SS316L / CF8M
Surface Finish: High Mirror Polished
Design Type: Circular Base Low-Profile Cleat
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Stainless Steel Marine Hinge Series
Process: Silica Sol Investment Casting + Multi-Stage Machining
Material: SS316 / SS304 / CF8M
Surface Finish: Smooth Satin Brushed / Bright Polished
Hinge Profiles: Square Butt...
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Stainless Steel Marine Deck Filler
Process: Silica Sol Investment Casting + CNC Machining
Material: SS316 / SS304 / CF8M
Surface Finish: High-Grade Sandblasting & Pickling
Component Type: Deck Fill Pipe with...
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Stainless Steel Marine Deck Fill
Process: Silica Sol Investment Casting + CNC Machining + Mirror Buffing
Material: SS316 / SS316L / CF8M
Surface Finish: High Mirror Polished Flange
Cap Text Mark: Embossed /...
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Product Range

01/

Deck & Dock Hardware: Cleats, fairleads, bow eyes, chocks, and deck fill plates engineered for high load-bearing capacity.

02/

Hinges, Latches & Fasteners: Heavy-duty hatches, dogging mechanisms, slam latches, and flush pull handles machined to exact tolerances.

03/

Rigging & Structural Fittings: Toggle jaws, eye terminals, shackles, chain plates, and stanchion bases manufactured from high-tensile marine-grade alloys.

04/

Through-Hull & Plumbing Fittings: Seacocks, skin fittings, hull strainers, and hose adapters pressure-tested for underwater applications.

Materials & Specifications

Alloy Grade	Common UNS / EN Designation	Primary Characteristics & Marine Suitability
Stainless Steel 316 / 316L	UNS S31600 / 1.4404	Standard marine grade with enhanced molybdenum content. High resistance to chloride pitting and crevice corrosion.
Stainless Steel 17-4PH	UNS S17400 / 1.4542	Precipitation-hardening martensitic stainless steel. Combines high hardness with corrosion resistance for heavy-load steering and rigging parts.
Silicon Bronze / Manganese Bronze	C87300 / C86500	Exceptional resistance to seawater bio-fouling and high mechanical wear; ideal for propellers, bushings, and traditional through-hull fittings.
Duplex Stainless Steel 2205	UNS S32205 / 1.4462	High strength and superior resistance to stress corrosion cracking in high-salinity industrial marine applications.

Surface Finishes: Mechanical mirror polishing (down to Ra 0.2 um), electrochemical passivation (ASTM A967 compliant to remove free iron), bead blasting, and custom electro-coating.

Dimensional Standards: Manufactured in accordance with ISO 2768-mK for machined features and ISO 8062-DCTG4 for investment casting tolerances.

Manufacturing & Machining

Silica Sol Investment Casting Process: Controls shell stability and wax pattern accuracy, yielding smooth as-cast surfaces and reducing subsequent machining allowances.

In-House CNC Machining: Multi-axis CNC milling and turning centers process critical mounting faces, threaded bores, and bearing surfaces in a single setup.

Thermal Treatment: Solution annealing and precipitation hardening performed under controlled atmospheric conditions to eliminate internal stresses and achieve specified yield strengths.

Quality Control

Marine hardware operates under cyclic fatigue and aggressive electrochemical conditions. Our inspection protocol verifies structural soundness prior to dispatch.

Non-Destructive Testing (NDT)

Fluorescent penetrant inspection (PT) executed per ASTM E165 to detect surface micro-cracks and porosity.

Chemical & Mechanical Verification

Spectrometer material analysis for exact elemental breakdown alongside tensile testing machines verifying yield and ultimate tensile strength.

Corrosion Resistance Testing

Neutral salt spray testing conducted per ASTM B117 (minimum 1,000-hour exposure cycles for stainless steel grades) to verify passivation quality.

Traceability

Heat numbers stamped directly onto structural parts, linking finished goods to raw material pouring logs and EN 10204 3.1 certificates.

OEM Customization

Engineering Review

DFM (Design for Manufacturability) analysis on customer-supplied CAD models (STEP, IGES, SolidWorks) to optimize draft angles, gate locations, and wall thickness uniformity.

Rapid Prototyping

Stereolithography (SLA) resin patterns or 3D-printed wax models available for functional fit-testing before committing to hard tooling.

Tooling Development

In-house die-sinking EDM and high-speed CNC toolrooms construct durable investment casting dies designed for long production lifecycles.

Production & Delivery

Batch Scalability

Capable of handling prototype runs starting at 50 pieces up to mass production batches exceeding 10,000 units.

Packaging Protocols

Anti-corrosion VCI (Volatile Corrosion Inhibitor) bagging, individual bubble wrapping, and reinforced export-grade plywood crates designed to withstand ocean freight without transit damage.

Logistics Support

Direct export coordination via FOB, CIF, or DDP terms to major ports across North America, Europe, and Australia.

FAQ

Q: What is the difference between 304 and 316 stainless steel for marine hardware?

A: Grade 304 contains 18% chromium and 8% nickel, making it suitable for freshwater or mild atmospheric conditions. Grade 316 adds 2% molybdenum, which creates a passive surface barrier specifically resistant to chloride ion attack, pitting, and crevice corrosion in marine saltwater environments.

Q: What surface treatments do you use to prevent tea staining on stainless steel?

A: All stainless steel marine hardware undergoes mechanical polishing followed by an electrochemical passivation process in citric or nitric acid baths. This removes free iron particles left from tooling and accelerates the formation of the chromium-oxide protective passive layer, preventing surface discoloration.

Q: Can you provide EN 10204 3.1 Material Test Reports?

A: Yes. Every production batch is issued with full material certification (MTR) detailing chemical composition, mechanical test results, and heat treatment logs traceable to the raw material melt.

Q: What is the typical lead time for custom OEM marine hardware projects?

A: New custom projects requiring tooling development typically take 30 to 45 days for sample production, dimensional inspection, and client approval. Subsequent mass production and machining cycles require approximately 25 to 35 days depending on order volume and finishing complexity.

Q: What minimum order quantities (MOQ) apply for custom casting designs?

A: MOQs are evaluated based on part size, alloy type, and tooling investment. Generally, we accommodate pilot runs starting from 100 units to support product validation while maintaining cost-effective per-part unit economics.

Q: How do you inspect internal casting defects such as shrinkage or porosity?

A: We utilize dimensional CMM verification alongside radiographic testing (X-ray) and fluorescent liquid penetrant inspection (PT) upon request, ensuring structural soundness in critical load-bearing zones prior to shipment.

WUDI COUNTY SHUN YE STAINLESS STEEL PRODUCTS CO.,LTD. is one of the most professional marine hardware manufacturers and suppliers in China, also supports customized service. Welcome to buy bulk cheap marine hardware made in China here and get quotation from our factory. For price consultation, contact us.