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Marine and offshore equipment works under harsh conditions including heavy salt spray, high humidity, continuous wave impact and mechanical vibration. The corrosion resistance and anti-fatigue performance of fasteners are vital to ensure the safety of hulls and offshore structures. NINGBO TOPBOLT METALWORKS CO., LTD. provides special marine fasteners for hull construction, deck outfitting, mooring structures, cabin reinforcement and offshore platform accessories, suitable for cargo ships, yachts, offshore workboats and floating piers.
U-Bolts
Standards: DIN3570
Classic marine fasteners, widely used for clamping pipes, cable conduits, mooring fittings and guardrail bases. The curved profile fits round pipes perfectly and locks securely with matched nuts and washers. 316 stainless steel is recommended for open decks exposed to seawater, while hot-dip galvanized carbon steel is common for internal piping inside engine rooms.
Eye Bolts & Eye Nuts
Standards: DIN580, DIN582
Marine lifting and rigging hardware, designed for hoisting deck equipment, hatch covers and outfitting parts, and for temporary tensioning. Load testing is available per batch for safe lifting during onboard maintenance and cargo securing.
Socket Head Cap Screws
Standards: DIN912
Applied for cabin panels, hatch covers, deck guards and equipment housings. The flush head design prevents protruding edges that may cause tripping or rope snagging, ideal for interior cabin finishing and thin outfitting plate installation.
Cotter Pins & Castle Nuts
Standards: DIN94, DIN935
Professional anti-loosening assembly for heavily vibrating marine parts. The cotter pin locks the castle nut in position to eliminate loosening risk under long-term vibration. Frequently specified for steering gears, anchor winches and deck transmission mechanisms.
Marine Wedge Anchors
Standards: ETA approved marine anchoring specs
Used to fix supports, control cabinets and pipe brackets onto concrete decks, floating pier bases and concrete bulkheads. Perfect for retrofitting outfitting components where pre-embedded studs are not available.
| Item | Details |
|---|---|
| Product Types | U-Bolts, Eye Bolts & Eye Nuts, Socket Head Cap Screws, Cotter Pins & Castle Nuts, Marine Wedge Anchors |
| Materials | Carbon Steel, Stainless Steel 304 / 316 (A4) |
| Surface Finishes | Hot-Dip Galvanizing, Dacromet, Stainless Steel Passivation |
| Standards | DIN3570 / DIN580 / DIN582 / DIN912 / DIN94 / DIN935, ISO, GB |
| Customization | Custom U-bolt dimensions, non-standard eye bolt sizes, project kitting, MTC material test certificates available |
U-Bolts
Eye Bolts & Eye Nuts
Socket Head Cap Screws
Cotter Pins & Castle Nuts
Marine Wedge Anchors
TOPBOLT supplies complete anti-corrosion fastening solutions for marine applications. Share your drawings, material requirements, surface finish, applicable standards and order quantity with our team to get suitable selections for marine service.
