Cup Arm: Fastener Type M4 or #8 screws

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

Parameter	Typical range	Notes & selection driver
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

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 9001, DIN 7998, BS EN 15570

Parent Products

This component is used in the following industrial products

Furniture Hinge

A furniture hinge is a precision-engineered hardware component that connects doors, lids, or panels to furniture frames while allowing rotational movement.

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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

Typical Suppliers & Equivalents

Blum (Clip, Motion), Hettich (Quadro, Sensys), Grass (Dynapro, Optimo), Salice (Art, Slim)

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

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

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Manufacturers of Cup Arm

Manufacturer profiles associated with Cup Arm.

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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

Related Components

Side Rails

Side rails are structural components in seating module frames that provide lateral support and attachment points for other elements.

Edge Banding

Edge banding is a protective and decorative strip applied to exposed edges of furniture panels to conceal substrate materials and enhance durability.

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.

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.

Cup Arm