Stanley Modern Three Knuckle Maintenance Free Architectural Concealed Bearing Hinges For Metal Or Wood Doors – Pack Of 3 (4.5" X 4", Satin Chrome 26D)

LifeStan bearing system is a revolutionary concept in bearing construction and materials developed by The Stanley Works. It eliminates metal to metal contact between knuckles by creating its own bearing surface between the washer and sleeve. As the stainless steel washer extends into the sleeve it eliminates metal-to-metal contact between the pin and barrel, resulting in a smooth, quiet operation superior to that of a ball bearing assembly.

• Concealed LifeStan bearing for trouble-free, long life – no oil, no grease, no maintenance.
• Can be installed right- or left-handed on doors measuring up to 4’-by-10’ feet, ideal fit for wood and metal doors, medium to heavy weight doors and medium to high frequency usage applications.
• Supplied with both #14 wood screws and #12-24 metal machine screws.
• Pins in nonferrous hinges are stainless steel, exceeds ANSI/BHMA Grade 1 standards by 50%.
• Patented Two Piece Bearing System - LifeSpan bearing system carries a limited lifetime warranty for the life of the building.