Hinge Plates: Thickness 12-25 mm, Flatness ≤0.05 mm per 100 mm

Component Specifications

Definition

Hinge plates are precision-engineered metal plates that form the primary structural interface in luffing hinge assemblies, enabling controlled rotational movement between connected machine elements while transferring significant mechanical loads. These components typically feature precisely machined bearing surfaces, bolt patterns, and alignment features to ensure smooth articulation and structural integrity under operational stresses.

Working Principle

Hinge plates operate on the principle of rotational articulation around a fixed pivot axis, allowing connected machine sections to move relative to each other while maintaining structural continuity. The plates distribute mechanical loads through their bearing surfaces and fastening points, with precision-machined interfaces minimizing friction and wear during movement.

Materials

High-strength alloy steel (typically ASTM A572 Grade 50 or equivalent), heat-treated to achieve optimal hardness (typically 28-32 HRC) and toughness properties. Surface treatments may include zinc plating, powder coating, or specialized anti-corrosion coatings depending on application environment.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flatness	≤0.05 mm per 100 mm
Hardness	28-32 HRC
Thickness	12-25 mm
Surface Finish	Ra 3.2 μm or better
Yield Strength	≥345 MPa
Tensile Strength	≥500 MPa
Dimensional Tolerance	±0.1 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 2768-m, DIN 7168

Parent Products

This component is used in the following industrial products

Luffing Hinge

A specialized hinge mechanism that enables the angular adjustment of a luffing jib on cranes and lifting equipment.

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Engineering Analysis

Risks & Mitigation

Fatigue failure under cyclic loading
Corrosion in harsh environments
Wear at bearing surfaces
Misalignment due to improper installation
Bolt loosening under vibration

FMEA Triads

Trigger: Insufficient material strength or improper heat treatment
Failure: Crack propagation leading to structural failure
Mitigation: Implement strict material certification and heat treatment process controls with regular hardness testing

Trigger: Poor surface finish or inadequate lubrication
Failure: Excessive wear at pivot points leading to increased clearance and reduced precision
Mitigation: Specify precise surface finish requirements and implement regular lubrication maintenance schedules

Trigger: Improper bolt torque or fastener selection
Failure: Joint loosening leading to misalignment and accelerated wear
Mitigation: Use calibrated torque tools and specify appropriate locking fasteners with regular inspection protocols

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-m, dimensional tolerances ±0.1 mm, flatness ≤0.05 mm per 100 mm

Test Method

Non-destructive testing (magnetic particle or dye penetrant), dimensional verification with CMM, hardness testing with calibrated Rockwell tester, load testing to 150% of rated capacity

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Hinge Plates

Manufacturer profiles associated with Hinge Plates.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of hinge plates in luffing hinge mechanisms?

Hinge plates provide the structural interface that enables controlled rotational movement between machine sections while transferring mechanical loads and maintaining alignment precision.

What materials are commonly used for manufacturing hinge plates?

High-strength alloy steels such as ASTM A572 Grade 50 are most common, often with heat treatment and surface coatings for enhanced durability and corrosion resistance.

How do hinge plates differ from standard hinge components?

Hinge plates are designed for industrial applications with higher load capacities, precision tolerances, and integration with larger mechanical systems, unlike consumer-grade hinges which handle lighter loads.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Hinge Plates