BB31 4-1/2 x 4-1/2 BALL BEARING .134 HINGE
Ships in 1-3 Business Days
Cal-Royal BB31 Ball Bearing Hinge – 4-1/2" x 4-1/2", .134 Gauge
Reliable, Smooth Operation for Medium-Duty Commercial Doors
The Cal-Royal BB31 is a full mortise, five-knuckle ball bearing hinge designed for medium-frequency doors in commercial and institutional settings. Built with precision and durability in mind, it ensures smooth door operation and long-lasting performance.
🔧 Key Features:
- Full mortise hinge with five knuckles for enhanced stability and alignment
- Two permanently lubricated ball bearings reduce friction and wear
- Standard weight design with .134" gauge thickness for medium-duty applications
- Constructed from high-quality 1040 steel or 304 stainless steel for strength and corrosion resistance
- Size: 4-1/2" x 4-1/2" – fits most commercial wood or hollow metal doors
- Meets ANSI/BHMA A156.1 standards for commercial-grade hinges
- Available with Non-Removable Pin (NRP) option for added security on outswing doors
- Supplied with fasteners for both wood and metal door frames
- Compatible with door closers and recommended for medium-frequency usage
- Offered in multiple architectural finishes including Satin Chrome (US26D), Satin Stainless Steel (US32D), Satin Brass (US4), and Flat Black (US1/622)
✅ Why Choose the Cal-Royal BB31?
- Ideal for offices, schools, healthcare facilities, and light commercial environments
- Provides smooth, quiet door movement with reduced maintenance needs
- Enhances door security and performance with durable ball bearing design
- Backed by Cal-Royal’s commitment to quality and reliability
Upgrade your door hardware with the Cal-Royal BB31 – engineered for smooth performance and built to last.
Ships in 1-3 Business Days
Cal-Royal BB31 Ball Bearing Hinge – 4-1/2" x 4-1/2", .134 Gauge
Reliable, Smooth Operation for Medium-Duty Commercial Doors
The Cal-Royal BB31 is a full mortise, five-knuckle ball bearing hinge designed for medium-frequency doors in commercial and institutional settings. Built with precision and durability in mind, it ensures smooth door operation and long-lasting performance.
🔧 Key Features:
- Full mortise hinge with five knuckles for enhanced stability and alignment
- Two permanently lubricated ball bearings reduce friction and wear
- Standard weight design with .134" gauge thickness for medium-duty applications
- Constructed from high-quality 1040 steel or 304 stainless steel for strength and corrosion resistance
- Size: 4-1/2" x 4-1/2" – fits most commercial wood or hollow metal doors
- Meets ANSI/BHMA A156.1 standards for commercial-grade hinges
- Available with Non-Removable Pin (NRP) option for added security on outswing doors
- Supplied with fasteners for both wood and metal door frames
- Compatible with door closers and recommended for medium-frequency usage
- Offered in multiple architectural finishes including Satin Chrome (US26D), Satin Stainless Steel (US32D), Satin Brass (US4), and Flat Black (US1/622)
✅ Why Choose the Cal-Royal BB31?
- Ideal for offices, schools, healthcare facilities, and light commercial environments
- Provides smooth, quiet door movement with reduced maintenance needs
- Enhances door security and performance with durable ball bearing design
- Backed by Cal-Royal’s commitment to quality and reliability
Upgrade your door hardware with the Cal-Royal BB31 – engineered for smooth performance and built to last.