3 Pack Commercial Grade Ball Bearing Door Hinges 4-1/2 x 4-1/2 Full Mortise Matte Black JS-5BB2 UL Listed 3 Hour Fire Rated for High-Traffic Interior And Exterior Doors Smooth Quiet Operation And Durable Heavy Duty Construction

3-Pack Ball Bearing Door Hinges, 4.5x4.5in, UL Listed
✔️ 3-pack hinges for full mortise, 3-hour fire rated, matte black

The commercial grade ball bearing door hinges are built for high-traffic doors in commercial spaces. They deliver smooth, quiet operation and dependable performance in offices, schools, and industrial facilities.

✅ 3 hinges per pack with full mortise design for secure mounting
✅ UL Listed and rated for 3 hours of fire protection
✅ Matte black stainless steel finish resists wear in busy areas
✅ Each pair supports up to 255 lbs per door
✅ Includes mounting screws for quick installation
✅ 4.5 x 4.5 inch square corners for precise fit

💡 What is a ball bearing door hinge used for in heavy-traffic commercial doors?

It's handy for keeping doors swinging smoothly under constant use. - helps with quiet operation and smooth swing under load - handy for full mortise mounting on commercial frames - UL listing and fire rating help meet building safety codes - pairing with stainless steel finish resists wear across years