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Don-Jo BB74545 Full Mortise Ball Bearing Hinge 4-1/2" x 4-1/2" Steel, Square Corner, 5-Knuckle
The Don-Jo BB74545 is a full mortise ball bearing hinge measuring 4-1/2" x 4-1/2" and constructed from durable steel, engineered for medium weight commercial doors with average frequency use. Featuring a 5-knuckle design with square corners and a 0.134 gauge steel body, this hinge meets ANSI A8112 template standards and is available in seven finishes to suit a wide range of commercial door applications. A non-removable pin (NRP) option is also available — specify NRP as a prefix when ordering.
Key Features
- Full Mortise Design: Engineered for full mortise installation, providing a clean, flush fit on commercial door and frame applications.
- Hinge Size: 4-1/2" x 4-1/2" dimensions suitable for medium weight doors in standard commercial settings.
- Steel Construction: 0.134 gauge steel material delivers reliable strength and long-term durability for standard duty commercial use.
- Ball Bearing Operation: Smooth ball bearing action reduces friction and wear, supporting consistent performance over average frequency use cycles.
- 5-Knuckle Configuration: Five-knuckle design provides enhanced stability and even load distribution across the hinge barrel.
- Square Corner Style: Square corner profile ensures compatibility with standard commercial door and frame preparations.
- ANSI A8112 Template Compliance: Manufactured to ANSI A8112 template standards for straightforward, code-compliant installation.
- Multiple Finish Options: Available in finishes 600, 632, 633, 639, 640, 651, and 652 to coordinate with a variety of door hardware specifications.
- Non-Removable Pin Option: NRP (non-removable pin) variant available for added security — specify NRP as a prefix when ordering.
Certifications & Compliance
- ANSI A8112 Template Compliant
- Standard Duty — Commercial Grade
Technical Specifications
- Subcategory: Hinges
- Product Group: Door Hinges and Pivots
- Product Subgroup: Full Mortise Hinges
- Product Type: Full Mortise Hinges
- Commercial/Residential: Commercial
- Corner Style: Square corners
- Duty Level: Standard Duty
- Knuckles: 5
- Product Size: 4.5" x 4.5"
- Product Category: Door Hinges and Pivots
- Department: Door Hardware
Typical Applications
- Commercial Office Buildings
- Educational Facilities
- Healthcare Institutions
- Retail Establishments
- Industrial and Warehouse Facilities
- Multi-Tenant Residential Properties
- Government and Municipal Buildings
Why Don-Jo BB74545?
Don-Jo full mortise ball bearing hinges are built to ANSI A8112 template standards using 0.134 gauge steel construction, delivering dependable standard duty performance for commercial door applications. The BB74545's 5-knuckle ball bearing design and broad selection of seven available finishes make it a versatile, professional-grade solution for medium weight commercial doors requiring consistent, low-maintenance operation.
Manufacturer Resources
Product Specs
- Subcategory:
- Hinges
- Product Group:
- Door Hinges and Pivots
- Product Subgroup:
- Full Mortise Hinges
- Product Type:
- Full Mortise Hinges
- Bearing Type:
- Ball Bearing
- Commercial/Residential:
- Commercial
- Corner Style:
- Square corners
- Duty Level:
- Standard Duty
- Knuckles:
- 5
- Product Model:
- BB74545
- Product Size:
- 4.5" x 4.5"
- Product Category:
- Door Hinges and Pivots
- Product Substrate:
- Steel
- Department:
- Door Hardware
Don-Jo NRPBB74545-652 – Frequently Asked Questions
How fast can I get the Don-Jo NRPBB74545-652 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Don-Jo NRPBB74545-652 come with a warranty?
Absolutely. The Don-Jo NRPBB74545-652 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Don-Jo NRPBB74545-652?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Don-Jo NRPBB74545-652 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.