McKinney MacPro MPB91 NRP Ball Bearing Hinge | 4-1/2" x 4-1/2" US32D Stainless Steel
The McKinney MacPro MPB91 NRP is a high-performance, contractor-grade stainless steel ball bearing hinge specifically designed for average traffic commercial applications. Engineered with a .134 Standard Weight thickness, this 5-knuckle, full mortise hinge is an essential solution for door restoration and new construction where durability and corrosion resistance are non-negotiable.
High-Security NRP (Non-Removable Pin) Innovation
The NRP (Non-Removable Pin) is a critical security feature for exterior or high-risk openings. It utilizes a hidden set screw within the hinge barrel that is completely inaccessible when the door is closed. This provides:
- Tamper Resistance: Prevents unauthorized removal of the door by ensuring the hinge pin cannot be tapped out from the outside.
- Optimal for Outward Swinging Doors: A vital solution for commercial door security on doors where the hinge barrel is exposed to the public side.
- Peace of Mind: Provides long-term reliability and safeguards against forced entry through hinge manipulation.
Key Performance & Safety Features
- Premium US32D Stainless Steel: Crafted from high-grade stainless steel with a satin finish, this hinge is an ideal solution for door edge reinforcement in environments prone to moisture, chemicals, or coastal air.
- Smooth Ball Bearing Action: Equipped with precision ball bearings to ensure effortless movement, particularly on doors with automatic closing devices.
- 3-Hour Fire Rating: Rigorously tested and UL certified for up to 3 hours, ensuring maximum safety and compliance in critical fire-rated partitions.
- ANSI/BHMA A156.1 Compliant: Associated with ANSI Number A5112, this hinge adheres to industry-leading benchmarks for structural integrity and functional performance.
Technical Details & Specifications
- Brand: McKinney (ASSA ABLOY)
- Model: MacPro MPB91 NRP
- Dimensions: 4-1/2" x 4-1/2" (Standard Weight .134 Gauge)
- Material: US32D (630) Satin Stainless Steel
- Fasteners Included: Shipped with all wood screws (1-1/4" x 12 FPHW) and all machine screws (1/2" x 12-24 FPHM) for a secure installation.
- Installation: Features a template screw hole pattern for precision alignment and rapid field replacement.
Why Choose the McKinney MacPro MPB91 NRP?
The McKinney MacPro MPB91 NRP is the definitive professional choice for projects that demand a high-security, fire-rated solution for door surface repair and security. Its combination of non-removable pin security, smooth ball-bearing operation, and the natural longevity of stainless steel makes it a cost-effective, high-intent architectural component. Investing in hardware that meets ANSI/BHMA standards ensures your facility remains secure, accessible, and compliant for years to come.
| General - US Finishes | US32D - Satin Stainless Steel/ 630 |
| Brand | McKinney |
| Hinge Height | 4.5" Hi |
| Hinge Width | 4.5" Wi |
| Hinge Grade/Thickness | Standard Wt .119 to .146 |
| Hinge Type | Full Mortise |
| Hinge Options | Ball Bearing, NRP (Non Removable Pin) |
| Base Material | Stainless Steel |
| Hinge Corners | Square |
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