Cuplock Ledger

(Horizontal Member) - EN10219

Product Overview

Cuplock Ledger, or horizontal member by ALTRAD SPAR’s modular scaffolding system, is the main element that connects between standards, thus forming the horizontal level of the structure and enabling sideward support to transoms and working decks. Forge blade ends, one on each end of the ledger, are made very close

specifications so that they can be fitted tightly into the lower cups of vertical standards. After the cup mechanism is engaged and locked, it provides a firm, vibration-free connection that maintains alignment even under heavy loading. The ledger is engineered and certified to keep safety standards set by BS EN 12811, BS EN 74, and Aramco GI 8.001 for structural ‍‌‍‍‌scaffolding.

Features & Advantages

  • Forged Blade Design: Manufactured from high-tensile steel, ensuring consistent fit and strength.
  • Optimistic Locking: Eliminates the need for bolts or loose fittings.
  • High Load Capacity: Supports distributed loads up to 6.3 KN per member.
  • Corrosion Resistance: Hot-dip galvanized (≥ 85 µm) for long-term durability.
  • Dimensional Precision: Tight tolerance ensures perfect alignment with standards.
  • Compatible: Fully interchangeable with global Cuplock systems meeting BS EN standards.

Technical Specifications

  • Material: Structural Steel S355 JR (EN 10025)
  • Tube: 48.3 mm OD Ă— 3.2 mm thickness (EN 10219)
  • Welding: COâ‚‚ / MIG per ISO 3834-2
  • Finish: Hot-Dip Galvanized (ISO 1461)

Dimensional Data

Item Code Description Length (m) Tube OD (mm) Wall (mm) Weight (kg)
SP-LD-0600 Ledger 0.6 m 0.6 48.3 3.2 2.2
SP-LD-0900 Ledger 0.9 m 0.9 48.3 3.2 3.2
SP-LD-1200 Ledger 1.2 m 1.2 48.3 3.2 4.2
SP-LD-1500 Ledger 1.5 m 1.5 48.3 3.2 5.3
SP-LD-1800 Ledger 1.8 m 1.8 48.3 3.2 6.1
SP-LD-2000 Ledger 2.0 m 2.0 48.3 3.2 6.7
SP-LD-2400 Ledger 2.4 m 2.4 48.3 3.2 7.9

Structural & Load Data

Parameter Unit Result Test Standard
Safe Working Load (SWL) kN 6.3 BS EN 12811 Annex D
Ultimate Load (UL) kN 9.5 BS EN 12811
Deflection at SWL mm ≤ 3.5 BS EN 12811
Safety Factor – 1.5 Aramco GI 8.001
Blade Shear Strength kN 22.5 Internal Test Certificate SPAR-QA-2024
Dimensional Tolerance mm ± 0.5 BS 1139
Connection Slip Limit mm ≤ 1.0 SABIC §9.4

Compliance Standards

Reference Description
Aramco GI 8.001 Defines minimum load capacity, bracing, and testing requirements.
SABIC §9.4 Specifies inspection intervals and acceptance criteria for scaffolding components.
BS EN 74 Requirements for forged fittings and couplers.
BS EN 12811 Structural and performance testing standard for temporary works equipment.
ISO 3834-2 Welding quality assurance for structural fabrication.
ISO 1461 Coating and galvanizing thickness specifications.

Each ledger is manufactured under strict process control and documented in accordance with the ALTRAD SPAR QA/QC Manual Rev. 5, fully auditable for Aramco and SABIC vendor inspections.

Quality Assurance (QA/QC)

Testing and Inspection Procedures:

  • Raw Material Verification: Mill Test Certificate (EN 10219).
  • Forged Blade Dimensional Check: Gauge inspection for correct radius and tolerance.
  • Welding Inspection: Visual + Magnetic Particle Test (MT) at 10% sampling.
  • Galvanizing Check: ≥ 85 µm coating thickness verified using calibrated Elcometer.
  • Proof Load Test: Conducted quarterly per BS EN 12811.
  • Traceability: Each piece is laser-marked with an item code, a batch number, and a QA stamp..

QA/QC Verification Summary

Stage Test / Inspection Standard Frequency
Material MTC Verification EN 10219 Every batch
Forging Dimensional Gauge BS EN 74 100%
Welding Visual + MT ISO 3834-2 10% sample
Coating Thickness Test ISO 1461 Each lot
Load Test Compression Frame BS EN 12811 Quarterly
Marking Visual ALTRAD SPAR SOP 12.3 100%

Marking & Identification

Each Ledger is permanently stamped with:

  • “ALTRAD SPAR– LEDGER – [Length] – [Batch No.] – [Heat No.] – [Year]”
  • QA inspection mark and batch traceability reference.
  • Optionally available with QR/barcode labels for asset tracking in ERP systems.

Typical Applications

  • Industrial access scaffolds
  • Tank and vessel scaffolding
  • Bridge decks and suspended platforms
  • Formwork, bracing, and shoring grids
  • Maintenance structures in refineries and petrochemical plants

Maintenance & Inspection Guidelines

Item Frequency Method
Visual inspection before issue Every hire cycle Check blade ends, tube dents, and corrosion
Dimensional recheck Annual Verify length and blade seating
Proof load retest Every 5 years Hydraulic load validation as per BS EN 12811