Overhead Universal RockLock™
RockLock™: The Adjustable Arm Safety System That’s Changing the Industry
The Overhead Universal RockLock™ System is an adjustable top-rail slab restraint that clamps to existing A-frames to prevent over-center tipping during slab storage, staging, and transport.
Stop Slabs at the Tipping Point.
The Overhead Universal RockLock™ System is a clamp-on top-rail slab restraint designed for existing A-frames, preventing over-center rotation and reducing slab tipping risk during warehouse storage and transport operations.
Developed by an engineer with 30+ years of industry experience solving slab handling challenges.
Slabs don’t fall from the bottom.
They fall when weight shifts past the center line at the top.
The Overhead Universal RockLock™ installs in seconds by clamping directly to the top rail of your existing A-frame—creating controlled restraint exactly where tipping begins.
No permanent modification.
No structural welding.
No dependence on straps alone.
Just engineered slab stabilization at the highest leverage point.
Why Do Slabs Tip From A-Frames?
Tipping isn’t random. It’s leverage.
Stone slabs stored on A-frames rely on balance and friction.
When slab weight shifts past the center line of support, gravity creates rotational force at the top rail.
That’s the tipping moment.
In warehouses and slab yards, this shift can be triggered by:
❌ Uneven slab removal from one side
❌ Forklift contact or vibration
❌ Strap fatigue over time
❌ Ground settling or rack movement
❌ Minor impact during staging
Once a slab crosses its balance point, straps react too late.
The failure begins at the top of the rack — not the bottom
The Overhead Universal RockLock™ clamps directly to the top rail of your existing A-frame to interrupt that rotational movement before over-center collapse occurs.
Two workers crushed at Stone Warehouse of Michigan.
When slabs tip from above, the force is immediate and catastrophic. Engineered restraint must act at the top rail — not after motion begins.
Meet the Overhead Universal RockLock™ System
Engineered Top-Rail Restraint for A-Frame Slab Storage
The Overhead Universal RockLock™ clamps directly to the top rail of your existing A-frame, creating active restraint at the highest leverage point.
That’s where tipping begins.
That’s where restraint must act.
Instead of relying on straps or bottom support alone, RockLock™ stabilizes slabs from above—interrupting over-center movement before gravity takes over.
No welding.
No permanent modification.
No structural rebuild required.
Engineered top-level slab stabilization — where tipping begins.
🔧 Key Mechanical Advantages
✅ Clamp-on top rail design — installs in minutes
✅ Adjustable locking arms secure slab faces from above
✅ Controls forward and backward rotational movement
✅ Compatible with warehouse racks, slab yards, and transport A-frames
✅ Heavy-duty U.S. construction
✅ Manual quick-lock system — no electronics or hydraulic
How the Overhead Universal RockLock™ Controls Tipping
Step 1
Clamp to the Top Rail
Position the RockLock™ securely on the top rail of your existing A-frame.
The clamp creates a fixed restraint point at the highest leverage location.
Step 2
Adjust the Locking Arms
Slide and secure the adjustable arms until they contact both slab faces.
This creates controlled forward and backward restraint.
Step 3
Load or Unload with Active Restraint
With the arms engaged, slabs remain stabilized during:
• One-sided unloading
• Uneven slab removal
• Minor impact or vibration
• Staged repositioning
Over-center movement is interrupted before collapse can occur.
Step 4
Release Only When Safe
Disengage the RockLock™ seconds before final slab transfer — maintaining control until the moment of removal.
✅ “Load or unload slabs with controlled over-center restraint.”
Engineering Specifications & Performance Data
🔩 Key Mechanical Features
Top-Rail Clamp Assembly
Creates active top-rail restraint at the highest leverage point of the slab rack.Adjustable Overhead Lock Arms
Secures slab faces from above to control forward and backward rotational movement.Tool-Free Quick-Lock Hardware
Manual locking mechanism designed for fast engagement and controlled release.Low-Profile Overhead Design
Operates above slab height to preserve workspace access and visibility.Modular Compatibility
Works with freestanding warehouse A-frames, slab yard racks, and transport A-frame systems.Field-Adaptable Configuration
Accommodates varying slab thicknesses and rack widths without structural modification or welding.
📐 Technical Specifications
Maximum Capacity:
6 slabs per A-frame rack (3 per side)Restraint Type:
Overhead top-rail clamp systemInstallation:
No welding or permanent modification requiredMaterial:
Heavy-duty structural aluminumFinish:
Corrosion-resistant brushed aluminumUnit Weight:
15 lbsDeployment Time:
Deployment Time: Typically under 5 minutes (field installation)Typical Configuration:
1 unit per A-frame — secures both sides simultaneously
Operational Risk & Liability Exposure
Operational Impact of Overhead Slab Instability
When slab storage lacks active top-rail restraint, companies face exposure in four critical areas:
Worker injury and fatality risk
OSHA citations and compliance violations
Product loss and breakage
Increased insurance scrutiny and liability claims
The Overhead Universal RockLock™ System interrupts over-center rotation at the highest leverage point — before gravity completes the fall sequence.
Measurable Organizational Benefits
Supports proactive OSHA compliance strategies
Reduces slab tipping during uneven unloading
Strengthens internal safety culture
Supports safer 2-person warehouse operations
Demonstrates proactive risk mitigation to insurers
"With the RockLock™, we finally feel confident sending out 2-man teams with a single truck.
No more balancing acts."
— Field Supervisor, Fabrication Partner
Install Active Top-Rail Slab Control Today
Protect your crew. Reduce rotational instability. Demonstrate proactive compliance — with a lightweight system that installs in minutes.
Active top-rail restraint isn’t an upgrade. It’s a control decision.
Overhead Universal RockLock FAQS
What makes the Overhead Universal RockLock™ different from strap-only systems?
The Overhead Universal RockLock™ System provides active top-rail restraint at the highest leverage point of the slab rack. Unlike strap-only systems, which primarily provide tension, RockLock™ mechanically interrupts over-center rotational movement before gravity completes a slab fall sequence.
Does this system require welding or permanent modification?
No. The Overhead Universal RockLock™ clamps directly to the top rail of existing freestanding A-frames. No welding, drilling, or structural modification is required.
Is this designed for warehouse storage or transportation?
The Overhead Universal RockLock™ System is primarily engineered for warehouse slab storage and slab yard environments. It is also compatible with transport A-frames when additional top-level restraint is required.
How many slabs can one unit secure?
Each unit supports up to 6 slabs per A-frame rack (3 per side), depending on rack configuration and slab thickness.
How does the system prevent slabs from tipping?
By clamping to the top rail and securing slab faces from above, the system controls forward and backward rotational movement. This interrupts over-center instability at the highest leverage point — before collapse occurs.
Will this help with OSHA compliance?
While no product can guarantee compliance, the Overhead Universal RockLock™ System supports proactive safety measures by reducing slab instability during storage and handling. It demonstrates a documented effort toward improved hazard control.
How long does installation take?
nstallation typically takes only a few minutes per A-frame. The tool-free quick-lock hardware allows for fast engagement and controlled release.
What material is the system made from?
The Overhead Universal RockLock™ is constructed from heavy-duty structural aluminum with a corrosion-resistant brushed finish.
Is the system heavy or difficult to move?
No. Each unit weighs approximately 15 lbs, making it easy to deploy, reposition, or transfer between racks.
Who is this system ideal for?
The Overhead Universal RockLock™ System is ideal for:
• Stone importers
• Slab distributors
• Fabrication warehouses
• Slab yard operators
• Companies seeking proactive liability mitigation
Does this system reduce insurance liability exposure?
The system supports documented risk mitigation efforts by addressing slab instability at the highest leverage point. Many operators use RockLock™ as part of broader safety improvement initiatives presented during insurance reviews.
Can this system be standardized across multiple warehouse locations?
Yes. Because it requires no permanent modification, the Overhead Universal RockLock™ can be deployed consistently across warehouse, yard, and transport A-frame configurations.
