Ives 5BB1 4-1/2" x 4-1/2" NRP Full Mortise Hinge - Five Knuckle - Ball Bearing - Non-removable Pin - Standard Weight

The Ives 5BB1 4-1/2 x 4-1/2 NRP is a five-knuckle, ball-bearing, full mortise commercial hinge in standard weight with a Non-Removable Pin (NRP). It is certified to ANSI/BHMA A156.1 for performance standards, meets ANSI/BHMA A156.7 for template hinge dimensions, UL listed for 3-hour fire doors, and UL classified for windstorm-rated door assemblies under listing R37965. American Locksets is an authorized Allegion Ives dealer stocking the 5BB1 4.5x4.5 NRP across multiple finishes with same-day shipping and free shipping on orders over $300.

Ives 5BB1 Hinge: Standard Weight, Five Knuckle, Ball Bearing

The 5BB1 is Ives's standard-weight five-knuckle ball-bearing full mortise hinge, designed for medium-weight doors under 150 lbs at medium-frequency use under 400 cycles per day. It uses two ball bearing assemblies, which provide smooth, quiet door operation across the full life of the hinge compared to plain-bearing hinges that develop wear and friction over time. Five knuckles, rather than the three knuckles found on economy-grade hinges, distribute load across a longer barrel and provide greater structural integrity on doors with regular traffic.

Full mortise means both leaves of the hinge recess into the door edge and the door frame face. This is the standard installation method for commercial hollow metal doors and frames and for wood commercial doors on metal frames. The hinge is non-handed and installed on both left-hand and right-hand doors.

For heavier doors over 150 lbs or high-frequency applications over 400 cycles per day, the correct specification is the Ives 5BB1HW, which uses four ball bearing assemblies.

Non-Removable Pin (NRP): Why It Matters on Outswing Doors

The NRP feature is the critical specification difference on this hinge versus the standard removable-pin 5BB1. On an outswing door, the hinge pin is exposed on the exterior of the opening when the door is closed. A standard removable pin can be driven out of the barrel from the exterior, removing the door from its hinges regardless of what lock is installed. The NRP configuration uses a set screw in the barrel that locks the pin in place when the door is closed, preventing pin removal and preserving the integrity of the opening even if the hinge is fully accessible from the outside. The NRP is the correct specification on any outswing door in a security-sensitive application.

Ives 5BB1 4.5x4.5 NRP Specifications

• SKU: 5BB1 4.5X4.5 NRP

• Size: 4-1/2 inch x 4-1/2 inch

• Weight Class: Standard Weight (doors under 150 lbs, under 400 cycles/day)

• Knuckles: Five

• Bearing Type: Ball Bearing (two assemblies)

• Hinge Type: Full Mortise

• Mounting Style: Square corners

• Pin Type: Non-Removable Pin (NRP). Set screw locks pin in barrel when door is closed

• Swage: 1/16 inch standard, providing 1/16 inch clearance between leaves

• Base Material: Steel, brass, or stainless steel depending on finish specified

• Fasteners Included: Machine screws (12-24 x 1/2 inch) for hollow metal doors and wood screws (1-1/4 inch x #12) for wood doors

• Certifications: ANSI/BHMA A156.1 Grade 1. ANSI/BHMA A156.7 template dimensions. UL listed 3-hour fire door. UL windstorm classification R37965

• Application: Commercial hollow metal and wood doors, interior and exterior, outswing and inswing

Available Finishes

The 5BB1 4.5x4.5 NRP is available across Ives's full architectural finish catalog including US3 Polished Brass, US4 Satin Brass, US10B Oil Rubbed Bronze, US15 Satin Nickel, US26 Polished Chrome, US26D Satin Chrome, US32 Polished Stainless Steel, US32D Satin Stainless Steel, and additional finishes. Confirm the finished code in order. Specify finish when ordering as the NRP option is available across the full range.

Browse all Ives 5 Knuckle Ball Bearing hinges, the complete Five Knuckle Ball Bearing catalog, and all Commercial Hinges at American Locksets.