Full harness safety belts are essential in construction, maintenance, and high-elevation work environments. Designed to protect workers from falls, these systems distribute force across multiple points of the body—shoulders, chest, and thighs—to prevent injury. A critical component is the key lock unit, which connects the harness to safety lines. During a fall, this part endures repeated high-impact loads, making reliable fastening a top priority. HARDLOCK Nuts provide a secure solution for fastening this life-saving component.

• During a fall, the key lock area absorbs impact forces many times the user’s body weight.
• Screws in the back-mounted key lock may loosen over time due to repeated motion, vibration, and load stress.
• Full harnesses must comply with updated safety belt standards under Japan’s Industrial Safety and Health Act (since 2019).
• Replacement cycles and periodic inspection requirements demand a fastening method that enables both secure installation and controlled disassembly.

• Applied to the key lock attachment point, where safety lines connect to the harness.
• Delivers consistent torque control for safe, secure fastening without risk of loosening.
• Supports routine inspections and part replacements by enabling easy yet secure re-tightening.
• Resists loosening under repeated dynamic loads, protecting users in the event of a fall.

• Zero Loosening: Eliminates risk of failure in the fastening point during load-bearing events.
• Enhanced Inspection Accuracy: Proper axial force can be verified and maintained during periodic checks.
• Regulation Compliance: Supports the full harness safety requirements mandated by law.
• Peace of Mind: Enables employers and users to trust that safety gear functions as designed—even under extreme conditions.

HARDLOCK Nut ensures fail-safe fastening in critical fall protection equipment, supporting both safety and legal compliance in industrial environments where lives depend on secure harness systems.