INDUSTRY COMPONENT

Cup Arm

A mechanical component in furniture hinges that connects the hinge cup to the mounting plate, enabling controlled door movement.

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Component Specifications

Definition
The cup arm is a critical component in concealed furniture hinges, typically made of steel or zinc alloy. It functions as the connecting link between the hinge cup (embedded in the door) and the mounting plate (attached to the cabinet frame). This component transfers rotational forces and controls the door's opening angle, ensuring smooth operation and precise alignment. Its design includes adjustment mechanisms for height, depth, and lateral positioning to accommodate various installation requirements.
Working Principle
The cup arm operates on a lever and pivot mechanism. When the door is opened, the arm rotates around its mounting point, transferring motion from the hinge cup to the mounting plate. This creates a controlled arc that allows the door to swing open while maintaining stability. Modern cup arms often incorporate cam-adjustment systems that enable fine-tuning of door position without disassembly.
Materials
Cold-rolled steel (typically SPCC or DC01 grades), zinc alloy (Zamak 3 or Zamak 5), or stainless steel (AISI 304). Surface treatments include powder coating, electroplating (nickel or zinc), or passivation for corrosion resistance.
Technical Parameters
  • Fastener Type M4 or #8 screws
  • Load Capacity 15-25kg per hinge depending on material
  • Opening Angle 90°, 110°, or 165° configurations
  • Adjustment Range Height: ±2mm, Depth: ±3mm, Lateral: ±2mm
  • Mounting Hole Pattern Standard 35mm or 26mm cup diameter compatibility
Standards
ISO 9001, DIN 7998, BS EN 15570

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cup Arm.

furniture hinge cup arm cabinet hinge component hinge adjustment mechanism concealed hinge parts door hardware Cup Arm Cup Arm in Furniture Manufacturing

Parent Products

This component is used in the following industrial products

Furniture Hinge

Mechanical joint enabling door/cabinet opening and closing

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Engineering Analysis

Risks & Mitigation
  • Material fatigue leading to fracture
  • Corrosion in humid environments
  • Stripped adjustment threads from over-tightening
  • Incompatibility with non-standard mounting plates
FMEA Triads
Trigger: Repeated stress cycles exceeding material endurance limit
Failure: Fatigue fracture at pivot point
Mitigation: Use higher-grade steel with proper heat treatment, implement finite element analysis in design phase, add reinforcement ribs at stress points
Trigger: Exposure to moisture without adequate corrosion protection
Failure: Rust formation leading to binding or seizure
Mitigation: Apply appropriate surface coatings (zinc plating, powder coating), use stainless steel in high-humidity applications, specify proper maintenance procedures
Trigger: Over-tightening during installation or adjustment
Failure: Stripped threads in adjustment mechanisms
Mitigation: Include torque specifications in installation instructions, use thread-locking compounds, design with thread reinforcement inserts

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.2mm for mounting holes, ±0.5° for angular alignment
Test Method
Cyclic load testing per EN 15570 (50,000 cycles at rated load), salt spray testing per ISO 9227 for corrosion resistance, torque testing for adjustment mechanisms

Buyer Feedback

★★★★☆ 4.5 / 5.0 (20 reviews)

"The technical documentation for this Cup Arm is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Furniture Manufacturing environments. No issues with the Cup Arm so far."

"Testing the Cup Arm now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the purpose of adjustment screws on a cup arm?

The adjustment screws allow precise positioning of the door after installation. Height adjustment moves the door up/down, depth adjustment moves it in/out, and lateral adjustment shifts it left/right for perfect alignment.

Are cup arms interchangeable between different hinge brands?

Generally not interchangeable due to proprietary designs. Cup arms are engineered to work with specific hinge systems from manufacturers like Blum, Hettich, or Grass, with different mounting patterns and adjustment mechanisms.

What causes cup arm failure in furniture hinges?

Common failure causes include material fatigue from repeated stress cycles, corrosion in humid environments, over-tightening of adjustment screws causing thread damage, or excessive load beyond rated capacity.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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