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  • NEVER use Screw Clamps as a lifting device.
  • NEVER make alterations to the clamps or clamp components for other uses
  • NEVER heat up or weld on not only clamps but also components
  • NEVER use as fall protection
  • NEVER remove warning label from clamps
  • The Working Load Limit (WLL) specified on the Screw Clamp is the load for one clamp. It is also a maximum load which clamps are designed to sustain in the straight line load condition. Horizontal or side pulls are rated at 75 percent of the WLL.
  • Never use the clamps for other materials except steel.
  • Do not use clamps on materials with a hardness greater than 300HB or less than 80HB which could cause a slip.
  • Do not use clamps on materials whose surface temperature is greater than 300 degrees F or less than 0 degrees F.
  • Always observe the rated capacity specified on the clamp.
  • The thickness of the work piece must fall within the range of the jaw opening specified on the clamp or in the specifications on each screw clamp page.
  • When clamping, insert the work piece into the end of the clamp’s jaw opening, make the swivel jaw horizontal to the work piece. Tightly fasten the screw. You are now ready to proceed with your fitting operation.
  • Failure to comply with manufacturers warnings may result in severe personal injury or even death.
  • For your safety and others around you always ask employer or manufacturer if it is safe to use tool in any questionable circumstance.


  • Store Screw Clamps in a clean and dry location when not in use.
  • Inspect the Screw Clamp for worn, damaged or missing parts prior the use.
  • After inspection, grease the operating parts liberally.
  • Conduct regular inspections of stored and in use clamps by maintenance personnel.
  • Before use, always check clamps for any problem and then hand over them to users.

Repair of clamps should always be performed by qualified maintenance personnel in a designated tool repair shop.