Horizontal Lifting Clamp – SJ Type

Usage Guidelines

For safe and effective operation, users must adhere to specific mechanical and operational requirements:

• Used in Multiples: Horizontal clamps should always be used in pairs or multiples to maintain balance and prevent the load from tilting or slipping.
• Safety Lock Engagement: The safety lock (or latch) must be fully engaged before the lift begins to prevent accidental release during transport.
• Load Insertion: The material to be lifted must be inserted to the full depth of the clamp’s jaw opening to ensure maximum grip.
• Alignment: The lifting direction (rope or chain angle) must be carefully maintained; many horizontal clamps are rated based on a maximum inclination angle, often not exceeding 30° to 45°from the vertical without reducing the rated capacity.
• Spring-Loaded Force: The SJ type typically features a spring-loaded tightening mechanism that provides a positive initial clamping force, ensuring the load does not slip before the full lifting tension is applied.

Common Sizes and Specifications

SJ Type clamps are generally categorized by their Working Load Limit (WLL) and Jaw Opening Range. While specific dimensions vary by brand, common capacities include:

• 5 Ton: Smallest standard size for light plates and beams.
• 0 Ton: Frequently used for standard structural steel.
• 0 Tons: Mid-range for heavier sheets and bundles.
• 0 to 5.0 Tons: Common for large industrial beams and thick plates.
• 0 to 10.0 Tons: Heavy-duty sizes for massive steel structures.
• Jaw Opening: Standard openings often range from 0–25mmfor smaller units up to 0–100mm for high-capacity models.

Crucial Precautions

• Underloading Risk: Avoid using high-capacity clamps to lift extremely light loads (less than 1/5 or 10%of the WLL), as the cam teeth may not bite into the material sufficiently to maintain a secure grip.
• Surface Condition: Never use clamps on oily, painted, or slippery surfaces that could significantly reduce friction and clamping force.
• Avoid Shock Loading: Tension must be applied slowly and smoothly. Sudden jerks or “bouncing” the load can lead to catastrophic failure.
• Material Hardness: Most standard clamps are designed for materials with a hardness below 37 HRC(Rockwell C); using them on hardened steel can damage the jaw teeth and cause slippage.
• Daily Inspection: Before every use, a qualified person should check for cracked frames, worn or chipped teeth, and malfunctioning safety locks.