Ives Steel 3 Knuckle Plain Bea...
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Ives Steel 3 Knuckle Plain Bearing Full Mortise Hinge with Square Corners

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Model: 3PB1 4.5x4.5 652
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Ives Steel 3 Knuckle Plain Bearing Full Mortise Hinge with Square Corners

Professional Full Mortise Hinge for Standard Weight Doors

The Ives Steel 3 Knuckle Plain Bearing Full Mortise Hinge delivers reliable performance for standard weight doors in low to medium frequency applications. This Grade 2 hinge features steel construction with plain bearing design and 3 knuckle configuration for dependable operation. Certified to exceed ANSI/BHMA A156.1 performance standards and meets ANSI/BHMA 156.7 template dimensions, this hinge comes complete with fasteners for both hollow metal and wood door installations.

Professional Features & Benefits

  • Grade 2 Performance Rating: Tested to 1,500,000 cycles for reliable long-term performance in medium-duty commercial applications.
  • Steel Construction: Durable steel substrate provides excellent strength and longevity for standard weight door applications.
  • Plain Bearing Design: Engineered specifically for standard weight doors and low to medium frequency usage applications.
  • 3 Knuckle Configuration: Three knuckle design provides proper support and smooth operation for standard door installations.
  • Complete Fastener Package: Includes wood and machine screws (12-24 x 1/2" UFPHMS, 12 x 1-1/4" FPHWS, 10-24 x 1/2" UFPHMS, 10 x 1" FPHWS for 3.5x3.5 hinge size).
  • ANSI/BHMA Certified: Exceeds ANSI/BHMA A156.1 performance standards and meets A156.7 template dimensions for code compliance.
  • Optional Enhancements Available: Hospital tip (HT), non-removable pin (NRP), security stud (SH), rounded corners (RC-1/4, RC-5/8), and security fasteners (SEC) for specialized applications.
  • UL Classification: UL Classified for windstorm rated assemblies (R37965) ensuring performance in demanding conditions.

Technical Specifications

  • ANSI/BHMA: ANSI/BHMA A156.1
  • Bearing Type: Plain Bearing
  • Commercial/Residential: Commercial
  • Corner Style: Square Corners
  • Department: Door Hardware
  • Duty Level: Medium Duty
  • Fasteners: Wood and Machine Screws
  • Grade: Grade 2
  • Knuckles: 3
  • Product Category: Door Hinges and Pivots
  • Product Function: Plain Bearing
  • Product Group: Door Hinges and Pivots
  • Product Model: 3PB1
  • Product Subgroup: Full Mortise Hinges
  • Product Substrate: Steel
  • Product Type: Hinges
  • Subcategory: Hinges and Pivots

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, stile width, and handing as applicable to this product.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
  4. Install all mounting hardware and secure the device to door and frame per manufacturer torque specifications.
  5. Adjust operational components for proper alignment, latching, and smooth operation throughout the full range of motion.
  6. Test device operation to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Ives Quality?

Ives architectural hinges deliver professional-grade reliability with steel construction tested to exceed ANSI/BHMA A156.1 performance standards and rated for 1,500,000 cycles. UL Classified for windstorm rated assemblies and complete with installation fasteners for immediate use. Engineered for demanding commercial applications where dependable performance and code compliance are essential.

Product Specs

Subcategory:
Hinges and Pivots
Knuckles:
3
Grade:
Grade 2
Fasteners:
Wood and Machine Screws
Corner Style:
Square Corners
Product Group:
Door Hinges and Pivots
Product Subgroup:
Full Mortise Hinges
Product Type:
Hinges
ANSI/BHMA:
ANSI/BHMA A156.1
Duty Level:
Medium Duty
Bearing Type:
Plain Bearing
Commercial/Residential:
Commercial
Product Model:
3PB1
Product Function:
Plain Bearing
Product Category:
Door Hinges and Pivots
Product Substrate:
Steel
Department:
Door Hardware

Ives 3PB1 4.5x4.5 652 – Frequently Asked Questions

1) Is the Ives 3PB1 hinge right for a standard weight door, or do I need a ball bearing hinge?
The 3PB1 is a plain bearing hinge built for standard weight doors in low to medium frequency openings, and it's rated Grade 2 at 1,500,000 cycles. That covers an office, a classroom, a tenant unit door. Where the door is heavy (thick wood, mineral core, glazed) or the opening cycles hard all day, a main entry, a corridor cross door, a restroom in a school, go to a ball bearing hinge instead. In our line the Orca Hardware 3535 Series is a 4-1/2 x 4-1/2 square corner ball bearing commercial hinge, and Don-Jo's HWBB74545 is a heavy weight full mortise ball bearing hinge in the same 4-1/2 x 4-1/2 size.
2) What size Ives 3PB1 hinge do I need for my door?
The 3PB1 comes in 3.5 x 3.5, 4 x 4, 4.5 x 4, 4.5 x 4.5, and 5 x 4.5 inches. Height is picked off door weight and width, and the second number is the open width, which has to clear the trim so the door swings past it. On a 1-3/8 inch interior door 3.5 x 3.5 is the usual call; 1-3/4 inch commercial doors up to 36 inches wide normally take 4.5 x 4.5. The 4.5 x 4 and 5 x 4.5 sizes exist for the cases where you need a taller leaf without extra open width, or extra throw clear of deep casing.
3) Will the Ives 3PB1 drop into an existing hinge mortise without recutting the frame?
Yes, if the existing prep is standard. The 3PB1 meets ANSI/BHMA A156.7 template dimensions, so the leaf outline and screw hole pattern match the standard template for its size. Match the size you're pulling out (a 4-1/2 x 4-1/2 for a 4-1/2 x 4-1/2) and the corners: the 3PB1 is a square corner hinge, so it goes into a square-cut mortise, typical of hollow metal frames and machine-routed commercial doors. If your existing mortise has radiused corners, order the rounded corner option, RC-1/4 or RC-5/8, to match the radius already cut.
4) What do I need to specify on an out-swinging exterior door so the hinge pin can't be pulled?
Order the 3PB1 with NRP, the non-removable pin option. On an out-swing opening the barrel is on the outside, so a standard pin can be tapped out and the door lifted off. NRP puts a set screw in the barrel that seats against the pin once the door is closed. A security stud, option SH, is the other piece worth adding: it's an interlocking stud and hole across the two leaves that holds the door in the frame even if the pin is defeated. Security fasteners (SEC) are available too if the screw heads are reachable from outside.
5) Does the Ives 3PB1 meet ANSI/BHMA requirements for a commercial spec?
It's certified to exceed ANSI/BHMA A156.1 performance and meets A156.7 template dimensions, at Grade 2 with 1,500,000 test cycles. That's the specification line to put on a submittal. It's also UL Classified for windstorm rated assemblies under R37965. Note that Grade 2 is the medium duty tier: if the drawing calls out Grade 1 heavy weight hinges, this isn't the hinge that meets it.
6) Can I use the Ives 3PB1 hinge on an electrified lock or an access control door?
No. The 3PB1 is a plain mechanical hinge with no wire path through it. To carry power through the door to an electric strike, electrified lever, or mag lock setup, you need an electric transfer hinge. In our line the Command Access ETH-CB70 is a 3 knuckle standard weight energy transfer hinge, so it's the closest match in weight and knuckle count to the 3PB1, and the BEST CECB179-12C is a steel full mortise concealed bearing electrified hinge with a 12-wire quick connect for higher wire counts. If you also need door position monitoring, the Command Access ETM-CB70 adds a door position sensor to the same 3 knuckle steel base.
7) The door is heavy and swings all day. Should I still use a plain bearing hinge like the 3PB1?
The 3PB1 is a plain bearing hinge built for standard weight doors in low to medium frequency openings, at medium duty. For a heavier leaf or higher traffic, a heavy weight ball bearing hinge suits better: the Don-Jo HWBB74545 is a heavy duty full mortise ball bearing hinge in 4-1/2 inch by 4-1/2 inch, and the HWBB75045 is the same heavy duty ball bearing type in 5 inch by 4-1/2 inch. Hager BB1168 is another heavy duty full mortise ball bearing option and comes with a non-removable pin.
8) Is the Emtek 91013 a substitute for the Ives 3PB1 on a commercial opening?
They share a bearing type and a corner style but not a duty class. The Emtek 91013 is a residential duty plain bearing hinge, 3-1/2 inch by 3-1/2 inch with square corners in plated steel, sold as a pair. The Ives 3PB1 is a commercial hinge, Grade 2 to ANSI/BHMA A156.1 and meeting A156.7 template dimensions. If the opening is specified to a commercial standard, the 91013 does not carry that. Emtek's 92013 is the heavy duty plain bearing version in the same 3-1/2 inch square corner size.
9) The frame will only take a half mortise hinge. Is there a plain bearing option for that?
The Ives 3PB1 is a full mortise hinge, so both leaves mortise into the door and frame. Where the frame cannot be mortised, the Hager 1129 is a half mortise plain bearing commercial hinge in 4-1/2 inch standard weight steel at heavy duty. The Hager 990 STEEL is a full surface plain bearing prison hinge, 3 inch by 4 inch with a welded tip at heavy duty, for detention or abuse-prone openings where nothing is mortised at all.
10) I need the door to self-close without a closer. Will a plain bearing hinge do that?
No. The Ives 3PB1 is a plain bearing hinge with no spring, so it holds position wherever the door is left. For self-closing action from the hinge itself, the Stanley 2060R is a full mortise spring hinge with square corners in 4-1/2 inch by 4-1/2 inch on a ferrous steel base at heavy duty. Square corner and 4-1/2 inch by 4-1/2 inch matches a size and corner style the 3PB1 also comes in, so the door prep can carry over.
11) Do I have to order screws separately for the Ives 3PB1, and does it work on both hollow metal and wood doors?
Screws are in the box, both kinds. The 3PB1 ships with wood and machine screws so it installs on a hollow metal frame and a wood door out of the same package. On the 3.5 x 3.5 size that's 12-24 x 1/2 inch and 10-24 x 1/2 inch undercut flat head machine screws for the metal side, plus 12 x 1-1/4 inch and 10 x 1 inch flat head wood screws for the door.
12) Is the Ives 3PB1 acceptable for a behavioral health or patient room door?
Order it with HT, the hospital tip option. That replaces the standard button tips with sloped tips top and bottom so there is no flat ledge on the barrel to catch a strap, a cord, or clothing. It's the same 3PB1 hinge otherwise, Grade 2 steel, plain bearing. Specify HT with the size and finish when you order; healthcare is one of the building types this hinge is used in.
13) I'm restandardizing hinges across a building. What finishes can I get the Ives 3PB1 in to match the doors I already have?
Twelve finishes: 600 primed for painting, 631 matte black, 632 bright brass, 633 satin brass, 639 satin bronze, 640 satin bronze dark, 641 oxidized bronze, 643E aged bronze, 646 satin nickel, 651 bright chrome, 652 satin chrome, and 695 dark bronze. For most commercial interiors the match is 652 satin chrome, which pairs with satin chrome and 626 satin chrome lever trim. Use 600 when the frames and hinges get painted out with the door.
14) Is a 3 knuckle hinge as good as a 5 knuckle one on a commercial door?
For standard weight doors at low to medium frequency, three knuckles is the right build, and the 3PB1 is Grade 2 certified at 1,500,000 cycles in that configuration. Five knuckles spread the load over more bearing surface, which is what you want as door weight and traffic go up. If the opening is heavier than standard weight, look at a 5 knuckle standard weight hinge such as the Stanley FBB191 in 4-1/2 x 4-1/2 or the McKinney MP79 MacPro full mortise. Knuckle count on its own doesn't decide it, door weight and cycle rate do.
15) Do I have to order the Ives 3PB1 handed, left or right?
No handing to specify. The 3PB1 is a full mortise plain bearing hinge with a removable pin, so the same hinge works on a left hand or right hand door, you just orient it in the mortise. Handing only becomes an ordering question on hinges built asymmetrically, such as concealed conductor hinges where the wire exits one side. Size, finish, corner style, and any option suffix are what you specify.
16) Is the Ives 3PB1 the same thing as a residential builder hinge from the big box store?
No. The 3PB1 is a commercial hinge, certified to exceed ANSI/BHMA A156.1 and tested to 1,500,000 cycles, with square corners for a machine-cut mortise and both wood and machine screws in the pack. Residential hinges are typically supplied with a 5/8 inch radius corner to match a router-cut wood jamb and are not carrying that certification. If the doors are actually residential, the Delaney RH35xx 3-1/2 x 3-1/2 bulk steel interior hinge with a 5/8 inch radius, or the Emtek 91013 3-1/2 x 3-1/2 residential plain bearing hinge with square corners, are the right shelf. For apartment corridor and unit entry doors in a managed building, stay with the commercial hinge.
17) What's the equivalent to the Ives 3PB1 if I need a radius corner instead of square?
Two routes. Order the 3PB1 itself with the rounded corner option, RC-1/4 or RC-5/8, which keeps the same Grade 2 plain bearing hinge and just changes the corner profile to match your existing mortise. Or cross to the Orca Hardware plain bearing commercial line, which is built radius from the start: the 3514 Series is 3.5 x 3.5 with a 1/4 inch radius and the 4014 Series is 4 x 4 with a 1/4 inch radius, both medium duty plain bearing. Measure the radius already cut in your jamb before choosing, 1/4 and 5/8 are not interchangeable.
18) What ball bearing hinge matches the Ives 3PB1 in 4-1/2 inch square corner?
The Orca Hardware 3535 Series is a 4-1/2 inch by 4-1/2 inch square corner ball bearing commercial hinge at medium duty, the same size and corner style the 3PB1 offers in 4-1/2 inch by 4-1/2 inch square corner. The Delaney CH401X is a 4 inch by 4 inch commercial ball bearing hinge with a square corner if the smaller prep is what is in the door. The 3PB1 itself is plain bearing, suited to standard weight doors at low to medium frequency.
19) Is there a lower cost interior residential option instead of a commercial hinge like the 3PB1?
For interior residential doors, the Delaney RH35xx bulk steel residential hinge in 3-1/2 inch by 3-1/2 inch with a 5/8 inch radius comes as a pair, and Deltana's DSB35 is a 3-1/2 inch square hinge sold as a residential pair. Both are residential parts. The Ives 3PB1 is a commercial hinge rated Grade 2 and tested to 1,500,000 cycles, which is what an office, school, or healthcare corridor door usually requires.
20) What is the difference between the Ives 3PB1 and a 5 knuckle standard weight hinge like the McKinney MP79?
Knuckle count and bearing type. The Ives 3PB1 is a 3 knuckle plain bearing full mortise hinge at medium duty. The McKinney MP79 MacPro is a full mortise hinge with 5 knuckles at standard duty, and the MPB79 is the MacPro 5 knuckle standard weight hinge as well. Stanley's FBB191 is another 5 knuckle full mortise standard weight hinge in 4-1/2 inch by 4-1/2 inch. Knuckle count changes the barrel appearance and the frame template, so confirm the prep before mixing 3 knuckle and 5 knuckle hinges on the same opening.
21) Can I order the Ives 3PB1 with a non-removable pin, or do I need a different hinge for an outswing exterior door?
The 3PB1 is available with a non-removable pin (NRP) as an option, along with hospital tip (HT), security stud (SH), and security fasteners (SEC). If you prefer a pre-configured NRP part, the Hager BB1168 is a heavy duty full mortise ball bearing hinge furnished with a non-removable pin, and the Deltana CSB45N is a 4-1/2 inch by 4-1/2 inch square hinge pair with a non-removable pin.
22) For a detention or high-abuse opening, what replaces a standard commercial hinge?
The Ives 3PB1 is a medium duty commercial hinge for standard weight doors at low to medium frequency, which is not the right class for a detention opening. The BEST BB855 is a heavy-duty steel double weight concealed ball bearing prison hinge in the detention hardware line, and the Stanley BB855 is a double weight prison hinge in 5 inch by 6 inch furnished with no holes and not swaged, so it can be prepped to the frame in the field.
23) Is the Hager 920 the same kind of hinge as the Ives 3PB1?
They are both full mortise medium duty steel hinges, but the barrel differs. The Hager 920 is a full mortise concealed plain bearing hinge with 2 knuckle steel construction, and its bearing is concealed. The Ives 3PB1 is a 3 knuckle plain bearing hinge in steel. A 2 knuckle barrel and a 3 knuckle barrel do not visually match on adjacent doors, so pick one across the fleet.
24) Which 3-1/2 inch square corner plain bearing hinge should I standardize on across a building?
For commercial openings, the Ives 3PB1 in 3-1/2 inch by 3-1/2 inch square corner is Grade 2 to ANSI/BHMA A156.1, tested to 1,500,000 cycles, and offered in twelve finishes from 600 primed for painting through 652 satin chrome and 695 dark bronze, which is what lets one part cover a mixed-finish building. The Schlage Residential S3P1010 is a 3-1/2 inch by 3-1/2 inch square corner plain bearing mortise hinge from the 1000 series at medium duty, sold in packs of three, which suits a door needing three hinges per leaf.
25) Do I need a non-ferrous hinge instead of the steel Ives 3PB1?
The Ives 3PB1 uses a steel substrate. Where a non-ferrous base is called for, the McKinney T2314 is a non-ferrous standard weight 5 knuckle hinge at medium duty. Note the knuckle count changes from the 3PB1's 3 knuckles, so the frame template differs.
26) Is the Ives 3PB1 sold as a pair or as a single hinge?
The 3PB1 is an architectural hinge ordered by the individual hinge, sized and finished per opening, which is how commercial hinges are specified, three per leaf on a standard 7 foot door and four on a taller one. That differs from the residential lines, where hinges like the Deltana DSB35 3-1/2 x 3-1/2 or the Delaney RH40xx are packed as pairs, and the Schlage Residential S3P1010 comes as a pack of three. Count your leaves before ordering.
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Can I return it if it doesn’t work for me?
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Does the Ives 3PB1 4.5x4.5 652 come with a warranty?
Absolutely. The Ives 3PB1 4.5x4.5 652 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 Ives 3PB1 4.5x4.5 652?
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