Horizontal Plate Clamp
Lifts plate in a flat/horizontal orientation — cam grips from above
Vertical Plate Clamp
Lifts plate in an upright/vertical orientation — self-locking cam
Horizontal vs Vertical
| Feature | Horizontal Clamp | Vertical Clamp |
|---|---|---|
| Plate orientation | Flat (horizontal) | Upright (vertical) |
| Grip method | Gravity + cam pressure | Self-locking cam — grips tighter under load |
| Plate thickness | Check nameplate range | Check nameplate range |
| Turning loads | NOT permitted | NOT permitted without purpose-built turning clamp |
| Number required | Minimum 2 per lift | Minimum 1 (usually 2 for balance) |
Always Check Manufacturer Specs
- WLL, plate thickness range, and conditions of use are on the nameplate
- Never exceed the rated WLL or plate thickness range
Cam Mechanism
Both clamp types use a self-locking cam that grips tighter as load increases. The cam pivots on a hardened pin and bites into the plate surface.
- Jaw opening: Determines the plate thickness range — check the min/max markings on the clamp body
- Cam teeth: Must be sharp and free of debris — worn teeth will not grip properly
- Cam pivot pin: Inspect for wear and free movement — a stiff cam may not engage
- Lock/latch: Some clamps have a locking lever — must be engaged before lifting
Inspection & Rejection Criteria
Inspect plate clamps before every use:
Reject Immediately If
- Worn or damaged cam teeth: reduced grip — plate can slip out during lift
- Stiff or seized cam pivot: cam must move freely to engage
- Cracked or bent body: structural failure risk
- Missing or illegible nameplate: WLL and range unknown
- Worn jaw faces: reduced clamping force
- Damaged or missing locking mechanism
- Spring mechanism faulty (where fitted)
Safe Use Rules
- Never use a horizontal clamp to lift vertically or vice versa — they are NOT interchangeable
- Check the plate thickness is within the clamp’s rated range before attaching
- Ensure the plate surface is clean, dry, and free of paint, oil, or scale at the grip point
- Always use at least 2 horizontal clamps for a balanced lift
- Clamps must be applied to the plate edge or face as designed — not to flanges, channels, or angles
- Perform a test lift — raise the plate just off the ground and verify the clamps are holding before proceeding
- Never walk under a plate suspended by clamps
- Tag and quarantine any clamp that has slipped, dropped a load, or been shock-loaded