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T: +86-156-0511-1716
E: hp018@hpcbkj.com
E: hp018@hpcbkj.com
In Fangong Industrial Park, Dongtai Town, Dongtai City
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Marine Hinged Bolts (also called hinged hole bolts) are high-strength fasteners designed for connecting critical components in marine and industrial equipment. They excel in resisting transverse loads, ensuring precise alignment, and maintaining connection stability under harsh conditions (high temperature, high pressure, impact).
High Transverse Bearing Capacity: Relies on the bolt’s own shear strength to bear lateral loads, outperforming ordinary bolts by 30-50%.
Precise Positioning: Transition fit between the bolt rod and hole ensures accurate component alignment, preventing relative displacement.
Dual Load-Bearing Function: Bears both transverse shear loads and axial tension, suitable for multi-force working environments.
Durable Material: Made of high-strength alloy steel (e.g., 40Cr, 35CrMo) with heat treatment, ensuring corrosion resistance and long service life.
Two-Section Screw Design: Threaded front section for component connection; non-threaded rear section for positioning, ensuring alignment accuracy.
Transition Fit: Bolt rod diameter is almost identical to the hole diameter (fit tolerance H7/js6), eliminating clearance and preventing component slack.
Heat-Treated Material: Undergoes quenching and tempering to enhance shear and tensile strength, suitable for heavy-duty loads.
Marine Applications: Used for connecting stern tube bearings, rudder system components, and hull structural parts—resisting wave impact and hull vibration to maintain connection stability.
Metallurgical Industry: Applied in blast furnaces, converters, and rolling mills—withstanding high temperatures (up to 300°C) and heavy loads to ensure equipment safety.
Mechanical Transmission: Connects gearboxes, couplings, and transmission shafts in marine engines—preventing relative displacement and improving transmission efficiency.
Textile Machinery: Fastens rollers and spindles in textile equipment—ensuring precise rotation and reducing product defects (e.g., uneven fabric).
Head: Hexagonal or cylindrical head design for easy tightening with standard tools (wrenches, socket sets). The head surface is treated with anti-slip patterns to prevent tool slippage during installation.
Screw Part: Divided into two sections:
Threaded Section (Front): Precision-machined metric threads (e.g., M16-M42) for secure engagement with nuts, ensuring axial preload and connection tightness.
Non-Threaded Section (Rear): Smooth, high-precision rod with strict diameter tolerance (±0.02mm) for transition fit with the hole, achieving accurate positioning.
Material & Coating:
Base Material: High-strength alloy steels (40Cr, 35CrMo, 42CrMo) with good toughness and fatigue resistance.
Surface Coating: Options include hot-dip galvanizing (corrosion resistance for marine environments), Dacromet coating (high-temperature resistance), and chromium plating (wear resistance).
Shear Resistance: When connected components tend to slide transversely, the non-threaded section of the bolt bears the shear force, relying on its high shear strength to prevent relative movement.
Axial Load Bearing: The threaded section generates preload through torque tightening, clamping the connected components and bearing axial tension, ensuring connection tightness.
Positioning Accuracy: Transition fit between the bolt rod and hole eliminates clearance, fixing the components in the correct position and maintaining alignment even under vibration.
Feature | Marine Hinged Bolts | Ordinary Bolts |
Fit Method | Transition fit (rod diameter ≈ hole diameter) | Clearance fit (hole diameter 0.5-1mm larger) |
Transverse Load Bearing | Relies on bolt shear strength | Relies on friction from pre-tightening torque |
Transverse Capacity | 30-50% higher than ordinary bolts | Lower, prone to slack under impact |
Positioning Accuracy | High (no clearance) | Low (clearance causes component movement) |
Application Scenarios | Heavy load, high impact, high accuracy needs | General fastening, low-load environments |
Custom Manufacturing: Produces hinged bolts with custom thread sizes, rod lengths, materials, and coatings based on customer drawings and application requirements.
Quality Testing: Conducts strict quality inspections, including shear strength testing, tensile testing, fit tolerance testing, and corrosion resistance testing (salt spray test).
Technical Consultation: Provides professional advice on bolt selection, installation torque, and maintenance based on the customer’s equipment type and working conditions.
After-Sales Guarantee: Offers a 24-month warranty for manufacturing defects; provides free replacement for bolts that fail under normal use.
Logistics Support: Cooperates with global logistics providers to ensure fast delivery, with emergency shipment options for urgent maintenance needs.
