Cuplock – Universal Jack

(Top & Bottom Adjustable Support) EN74 / BS1139

Product Overview

Cuplock Universal Jack is a dual-purpose adjustable component that can be used at both the top and bottom of scaffolding and shoring systems. By means of a Base Jack (when put on the ground) or a U-Head Jack (when placed at the top), it is a device that provides vertical adjustability and ensures that the load is transferred correctly through the scaffold structure. The Universal Jack can deliver accurate changes under heavy load situations because it is made from high-strength S355 steel with rolled ACME threads. To the Aramco GI 8.001, SABIC §9.4, BS EN 74, and BS EN 12811 standards; all jacks are subjected to 100% dimensional and coating inspection.

Key Features & Advantages

  • Dual Application: Can be used as either a top or a bottom adjustable jack.
  • High Load Capacity: Tested safe working load (SWL) of 45 kN..
  • Smooth Adjustment: Precision-rolled ACME threads ensure effortless rotation under load.
  • Full Compliance: Conforms to Aramco, SABIC, and BS EN performance standards.
  • Galvanized Protection: Hot-dip galvanized with ≥ 85 µm coating for superior corrosion resistance.
  • Universal Compatibility: Fits , , and standard 48.3 mm scaffolding systems.

Technical Specifications

  • Material: Carbon Steel Grade S355 (EN 10025)
  • Thread Type: ACME / Trapezoidal Rolled Thread
  • Spindle Diameter: 36 mm
  • Adjustment Range: 300–600 mm
  • Welding: CO₂ / MIG per ISO 3834-2
  • Finish: Hot-Dip Galvanized (ISO 1461, ≥ 85 µm coating)

Dimensional Data

Item Code Description Spindle Length (mm) Thread Length (mm) Plate Type Plate Size (mm) Weight (kg)
SP-UJ-0450 Universal Jack 450 mm 450 300 Solid Plate 150 × 150 × 6 4.0
SP-UJ-0600 Universal Jack 600 mm 600 400 Solid Plate 150 × 150 × 6 4.3
SP-UJ-0750 Universal Jack 750 mm 750 450 Solid Plate 150 × 150 × 8 4.8
SP-UJ-0900 Universal Jack 900 mm 900 600 Solid Plate 150 × 150 × 8 5.3

Structural Performance

Parameter Unit Result Reference Standard
Safe Working Load (SWL) kN 45 BS EN 12811 Annex D
Ultimate Load (UL) kN 68 BS EN 12811
Adjustment Range mm 300–600 Design Specification
Safety Factor – 1.5 GI 8.001
Plate Bending Strength kN·m 5.5 Internal Test SPAR-QA-UJ/2024
Thread Tolerance mm ± 0.5 BS EN 74
Galvanizing Thickness µm ≥ 85 ISO 1461

Universal Jacks are compression load-tested using calibrated hydraulic testing rigs under the supervision of third-party agencies such as TUV, SGS, or Intertek.

Compliance & Certifications

Standard / Client Clause Description
Aramco GI 8.001 5.3 Base and adjustable jacks – design and testing requirements.
SABIC §9.4 7.2 Structural scaffolding inspection and retesting frequency.
BS EN 74 Clause 4 Coupler and jack mechanical performance.
BS EN 12811-1 Annex D Structural and load testing for temporary works.
ISO 1461 Clause 6 Hot-dip galvanizing inspection.
ISO 3834-2 Clause 8 Welding process control and QA.

All jacks are produced and certified under Arabian ALTRAD SPAR’s ISO 9001:2015 Quality Management System and verified against Aramco and SABIC audit protocols.

Quality Assurance & Inspection

QA/QC Procedures:

  • Raw material verification through Mill Test Certificates (EN 10219).
  • Thread machining inspection using precision pitch gauges.
  • Galvanizing thickness testing (minimum 85 µm).
  • Proof load testing (45 kN SWL) under axial compression.
  • Dimensional check (length, straightness, and plate flatness).
  • Final marking and QA documentation per ALTRAD SPARQA SOP 12.3.

QA/QC Verification Summary

Stage Inspection Method Acceptance Criteria Frequency
Material MTC Verification S355 JR / EN 10219 Each Batch
Thread Pitch Gauge ± 0.5 mm 100 %
Weld Visual + MT No visible cracks 10 %
Galvanizing Coating Gauge ≥ 85 µm Each Lot
Load Test Hydraulic Frame ≥ 45 kN Quarterly
Marking Visual Batch + Heat No. 100 %

Identification & Traceability

Each Universal Jack is permanently engraved with:

  • “ALTRAD SPAR– UNIVERSAL JACK – [Length] – [Batch No.] – [Heat No.] – [Year].”
  • QA inspector ID and test certificate reference.
  • Optional QR/barcode label for digital tracking under ALTRAD SPARERP or SAP systems.

Typical Applications

  • Shoring and formwork systems (as top or base support)
  • Heavy-duty scaffolding foundations
  • Industrial maintenance and shutdown scaffolds
  • Pipe-rack and tank platform supports
  • Bridge and structural formwork operations

Maintenance & Inspection

Item Frequency Method
Visual inspection Before each use Check threads, welds, and plate surface
Lubrication Monthly Apply anti-seize grease on the threads
Galvanizing retest Every 3 years Ensure ≥ 85 µm coating
Proof load retest Every 5 years Verify ≥ 45 kN SWL

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