McKinney SP3786-4-1/2x4-1/2-US26D Full Mortise StormPro Heavy Weight Bearing Hinge, Five Knuckle, 4-1/2" x 4-1/2", Square Corner, 626 Satin Chrome Finish

The McKinney SP3786 StormPro is a full mortise heavy weight bearing hinge engineered for openings that must withstand extreme conditions, including tornado and storm shelter applications. Measuring 4-1/2" x 4-1/2" with a square corner design and finished in 626 Satin Chrome, this five knuckle hinge combines rugged construction with smooth, reliable operation. Built to carry heavy doors under high-traffic and high-stress environments, it provides the durability required for life-safety rated assemblies. Its bearing design reduces wear over time, making it a dependable choice for commercial and institutional doors where long-term performance and code compliance are essential.

Features

• Full mortise heavy weight bearing hinge designed for demanding, high-cycle openings.
• Five knuckle construction delivers strength and stable load distribution.
• 4-1/2" x 4-1/2" size with square corner configuration for standard door prep.
• StormPro engineering makes it suitable for tornado-resistant and storm shelter door assemblies.
• 626 Satin Chrome finish offers a clean, professional appearance with corrosion resistance.
• Bearing design minimizes friction and extends the service life of the hinge.

Functional Details

The StormPro bearing hinge is built to support heavy doors while maintaining smooth movement, using concealed bearings between the knuckles to reduce wear during frequent operation. Its reinforced construction allows it to meet the performance demands of tornado and storm shelter rated openings.