Five-Point Base: Load Capacity 120-150 kg, Diameter 600-750 mm

Component Specifications

Definition

A five-point base is a structural component of ergonomic office chairs, typically featuring five radially arranged legs that connect to a central hub. It provides a stable foundation that distributes user weight evenly, prevents tipping, and supports the chair's swivel and height adjustment mechanisms. Designed with industrial engineering principles for optimal load distribution and durability.

Working Principle

Utilizes a pentagonal geometry to distribute weight evenly across five contact points, enhancing stability through a wider support base than traditional four-point designs. The central hub houses the caster sockets and gas lift cylinder interface, allowing 360-degree rotation and vertical adjustment while maintaining structural integrity under dynamic loads.

Materials

Typically injection-molded nylon (PA6 or PA66 with 30% glass fiber reinforcement) or die-cast aluminum (ADC12 alloy). High-end versions may use reinforced polypropylene or magnesium alloys.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	1.8-3.2 kg
Diameter	600-750 mm
Leg Thickness	8-12 mm
Load Capacity	120-150 kg
Caster Socket Type	11 mm standard or 13 mm heavy-duty

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 7173, DIN EN 1335, ANSI/BIFMA X5.1

Parent Products

This component is used in the following industrial products

Ergonomic Office Chair

Industrial-scale manufactured seating solution for workplace ergonomics and comfort.

View Product Details

Ergonomic Task Chair with Lumbar Support

Industrial-scale manufactured office chair with adjustable lumbar support for prolonged sitting comfort

View Product Details

Engineering Analysis

Risks & Mitigation

Structural fatigue under cyclic loading
Caster socket wear leading to instability
Material degradation from UV exposure
Floor damage from improper caster selection

FMEA Triads

Trigger: Insufficient glass fiber content in nylon
Failure: Leg fracture under dynamic load
Mitigation: Maintain minimum 30% glass fiber reinforcement and implement material certification

Trigger: Improper caster socket tolerances
Failure: Caster wobble or detachment
Mitigation: Implement statistical process control for socket dimensions (±0.2mm tolerance)

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5mm on critical dimensions, ±1° on leg angular placement

Test Method

ANSI/BIFMA X5.1 cycle testing: 100,000 swivel cycles, 200,000 impact drops from 50mm height

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 Five-Point Base

Manufacturer profiles associated with Five-Point Base.

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Related Components

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

Why five points instead of four?

Five-point design provides 25% more stability, reduces tipping risk, and distributes weight more evenly across flooring surfaces.

What materials are most durable?

Glass-fiber reinforced nylon offers optimal strength-to-weight ratio, while die-cast aluminum provides maximum durability for heavy-use environments.

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.

Five-Point Base