Ringlock – Base Jack

(Adjustable Foundation Support) - EN10219

Product Overview

Base Jack is the adjustable foundation support that gives the Ringlock modular scaffolding system the most basic yet necessary support of a structure. It is the device that actually makes each scaffold tower, birdcage, or access bay structurally stable and safe by starting from a level, load-bearing base. This is a rolled-thread spindle with a forged nut and a galvanized base plate, welded at the bottom to evenly distribute the load. The material used for the product is S355 grade steel, and it is tested entirely under compression to BS EN 12811 Annex D; thus, the Base Jack can provide a safe working load of 45 kN and an acceptable leveling range up to 300 mm.

This component can be deployed as a hybrid of (Cuplock) Base Jacks across ALTRAD SPAR’s hire and sales inventory, while remaining dimensionally compliant with Ringlok standards.

Key Features & Advantages

  • Adjustable Leveling Range: ± 300 mm for accurate ground compensation.
  • High Load Capacity: 45 kN SWL / 67 kN ultimate load tested per BS EN 12811.
  • Universal Compatibility: Fits both Ringlock and Cuplock systems (36 mm spindle OD).
  • Corrosion Protection: Hot-dip galvanized ≥ 85 µm per ISO 1461.
  • Smooth Adjustment: ACME rolled threads prevent binding under load.
  • Stability: 150 × 150 mm plate prevents settlement and soil punch-through.
  • Maintenance-Free Operation: No bolts or pins; simple thread adjustment.

Technical Specifications

  • Material: Carbon Steel S355 / EN 10025
  • Thread Type: ACME Rolled / Trapezoidal
  • Spindle Diameter: 36 mm
  • Thread Pitch: 6 mm
  • Finish: Hot-Dip Galvanized (≥ 85 µm, ISO 1461)
  • Welding: COâ‚‚ / MIG per ISO 3834-2
  • Adjustment Range: 300 mm (Standard) — custom ranges available

Dimensional Data

Item Code Description Spindle Length (mm) Thread Length (mm) Plate Size (mm) Plate Thickness (mm) Weight (kg)
SP-RBJ-0450 Base Jack 450 mm 450 350 150 × 150 6 3.8
SP-RBJ-0600 Base Jack 600 mm 600 450 150 × 150 6 4.2
SP-RBJ-0750 Base Jack 750 mm 750 600 150 × 150 6 4.8
SP-RBJ-0900 Base Jack 900 mm 900 750 150 × 150 8 5.4

Load Capacity & Performance

Parameter Unit Result Reference
Safe Working Load (SWL) kN 45 BS EN 12811 Annex D
Ultimate Load kN 67 BS EN 12811
Adjustment Range mm 300–750 Design Spec
Base Plate Bending Strength kN·m 5.8 ALTRAD SPARTest QA-BJ-2024
Safety Factor – 1.5 Aramco GI 8.001
Coating Thickness µm ≥ 85 ISO 1461

Third-party-certified proof-load tests conducted by TÃœV, SGS, and Intertek verify compliance with Aramco and SABIC standards.

Compliance Standards

Standard / Client Clause Requirement
Aramco GI 8.001 § 5.3 / 6.2 Base and adjustable foundation design requirements
SABIC § 9.4 § 7.2 Periodic inspection and testing protocol
BS EN 74 Clause 4 Mechanical and thread tolerance performance
BS EN 12811-1 Annex D Load testing for scaffold accessories
ISO 1461 Clause 6 Galvanizing thickness and adhesion
ISO 3834-2 Clause 8 Welding QA and inspection process

Quality Assurance (QA / QC)

Inspection Process

  • Raw material MTC verification (EN 10219).
  • Thread pitch and depth measurement ± 0.5 mm.
  • Weld inspection (Visual + Magnetic Test).
  • Coating test ≥ 85 µm per ISO 1461.
  • Proof load test ≥ 45 kN at 300 mm extension.
  • Marking and documentation per ALTRAD SPAR QA SOP 12.3.

QA/QC Verification Summary

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

Identification & Traceability

Each Base Jack is clearly engraved:

ALTRAD SPAR| BASE JACK | LENGTH | BATCH No. | HEAT No. | YEAR
And stamped with the QA Inspector code and load rating.
Optional QR labels link to ALTRAD SPAR’s ERP database for digital traceability.

Applications

  • Ringlock and Cuplock modular scaffold bases
  • Shoring and formwork towers
  • Pipe-rack and equipment access platforms
  • Offshore and marine maintenance scaffolds
  • Industrial refinery and infrastructure projects

Maintenance & Inspection

Item Frequency Method
Visual Inspection Before each use Check the threads, nut, and plate for damage
Lubrication Monthly Apply anti-seize compound on threads
Coating Verification Every 3 years HDG ≥ 85 µm
Proof Load Retest Every 5 years Verify ≥ 45 kN