SubLift Offshore Lifting Clamp
SubLift Clamp
A bolt-free, dual-safety-lock offshore lifting clamp engineered for BHA operations.
The Voltaro SubLift Clamp is a high-performance offshore lifting clamp solution designed specifically for the handling of lifting subs during Bottom Hole Assembly (BHA) operations. It replaces the improvised, incident-prone methods of wrapping slings and rigging shackles with a single, purpose-built tool.
The Voltaro SubLift Clamp is a high-performance offshore lifting solution designed specifically for the handling of lifting subs during Bottom Hole Assembly (BHA) operations. It replaces the improvised, incident-prone methods of wrapping slings and rigging shackles with a single, purpose-built tool.
Manufactured in 316L Stainless Steel with an anti-corrosion surface coating, the SubLift Clamp is built to perform through years of offshore service in salt spray and H₂S-rich environments with minimal maintenance.
“Eliminate slings, shackles, and improvised handling tools from your BHA workflow — without sacrificing load capacity or certification compliance.”
1- Direct OD Clamping
Clamps on the sub’s outer diameter — not the threads. Eliminates abrasion damage and provides a fixed grip geometry in vertical or horizontal orientation.
2- Zero Loose Components
The bolt-free quick-lock design has no pins, shackles, or fasteners to manage. Dropped-object risk from lifting hardware is removed entirely.
3- Single-Operator Installation
Installs and releases in under 60 seconds by a single crew member. No additional rigging, no secondary personnel, no delay to BHA operations.
4- Offshore-Grade Construction
316L stainless steel with anti-corrosion coating. Engineered for marine environments — salt spray, H₂S exposure, and the thermal cycling of offshore service.
Engineered to Spec.
Technical Specifications
General Specifications
| Material | 316L Stainless Steel |
| Surface Finish | Anti-corrosion coating |
| Locking Mechanism | Dual safety hook system |
| Design | Bolt-free quick-lock / quick-release |
| Safe Working Load | 1 Ton (standard) — customizable |
| Safety Factor | Meets / exceeds offshore standards |
| Compatibility | Wide range of lifting sub ODs |
| Loose Components | None — bolt-free design |
| Maintenance | Minimal — periodic inspection only |
| Weight Profile | Lightweight high-strength design |
| Orientation | Vertical & horizontal capable |
| Environment | Offshore marine / H₂S rated |
Size & Part Number Reference
| 3½” | VSC 312 |
| 4″ | VSC 400 |
| 5″ | VSC 500 |
| 5½” | VSC 512 |
| 5⅞” | VSC 578 |
| 6⅝” | VSC 658 |
| 7″ | VSC 700 |
Custom sizes available for non-standard ODs. Contact Voltaro Systems with your lifting sub diameter and load requirements.
SubLift Clamp vs. Slings & Shackles
Product Comparison
The market has evolved from Rectangular Block Magnet to modern Neodymium rod systems. Swarfclean™ goes a step further — higher Gauss, higher temperature rating, and the only system with integrated swarf data logging as standard.
| Comparison Factor | Slings & Shackles | Voltaro SubLift Clamp |
|---|---|---|
| Rig-up time per lift | 5–15 minutes | ✓ Under 60 seconds |
| Crew required | 2–3 personnel | ✓ 1 personnel |
| Dropped object risk | High — pins, shackles | ✓ Zero — no loose parts |
| Pinch / crush injury risk | High at connection point | ✓ Minimal — hands-free op |
| Thread damage risk | Yes — sling abrasion | ✓ None — OD grip only |
| Horizontal handling | Difficult / improvised | ✓ Engineered capability |
| Loose components | Shackles, pins, rings | ✓ Zero |
| Certification burden | Per-sling recertification | ✓ Single tool cert — reuse |
| Maintenance requirement | High — slings degrade | ✓ Minimal — SS construction |
| Offshore suitability | General-purpose adaptation | Purpose-built & certified |
Every Feature. A Safety Decision.
Key Features
Dual Safety Hook Locking
Two independent safety hooks must both be deliberately disengaged to open the clamp. The tool cannot release accidentally under dynamic offshore load conditions.
Bolt-Free Quick-Lock
No bolts, no pins, no split rings. The quick-lock mechanism installs and releases without any tools or loose hardware — the single greatest dropped-object reduction on the drill floor.
Sub-Minute Installation
From stowed to load-ready in under 60 seconds, vertical or horizontal. Replaces 5–15 minutes of sling rigging per lift, compounding to hours of saved time across a campaign.
316L Stainless Steel
Marine-grade material selection — corrosion-resistant, high-strength, and rated for offshore environments. Anti-corrosion surface coating extends service life further.
OD Grip — Thread-Safe
Grips the sub’s outer diameter only — no contact with threaded sections. Eliminates the thread abrasion damage caused by sling wrapping, protecting your BHA inventory.
Horizontal Handling — By Design
Horizontal lifting sub removal is the highest-risk BHA task with traditional methods. The SubLift Clamp provides positive grip control in the horizontal plane — engineered in, not improvised.
Customizable Load Capacity
Standard SWL of 1 Ton covers the majority of BHA applications. Custom load ratings are engineered in-house for heavy BHA configurations — contact us with your requirements.
Minimal Maintenance
No consumable components, no slings to inspect and recertify between runs, no fasteners to replace. Periodic inspection of locking hooks and surfaces is all that is required.