BEST BB855 Heavy-Duty Steel Do...
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$198.82
BEST BEST BB855 Steel Double Weight Concealed Ball Bearing Prison Hinge BEST-BB855

BEST BB855 Heavy-Duty Steel Double Weight Concealed Ball Bearing Prison Hinge

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Model: BEST-BB855-600-5x6
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BEST BB855 Heavy-Duty Steel Double Weight Concealed Ball Bearing Prison Hinge

Maximum Security Door Hardware for Detention Facilities

The BEST BB855 is a heavy-duty prison hinge engineered for high-security detention applications requiring exceptional strength and tamper resistance. Constructed from double weight steel with concealed ball bearing operation, this hinge supports doors weighing up to 800 lbs based on a 3' x 7' door with 3 hinges. Each hinge features two concealed hardened steel races containing sixteen 1/8" hardened and ground steel balls for smooth, silent operation while maintaining maximum security integrity.

Professional Features & Benefits

  • Heavy-Duty Load Capacity: Double weight steel construction supports doors weighing up to 800 lbs (363 Kg) based on 3' x 7' door with 3 hinges for demanding detention applications.
  • Concealed Ball Bearing System: Two concealed hardened steel races each containing sixteen 1/8" (3.2mm) hardened and ground steel balls ensure smooth, long-lasting operation while preventing tampering access.
  • Tamper-Resistant Design: Concealed bearing assembly and welded, machined rolled knuckles provide enhanced security against forced entry attempts and vandalism.
  • Specialized Application Support: Designed for lead-lined doors to x-ray rooms and other exceptionally heavy doors in high-security environments.
  • Professional Construction: Rolled knuckles are welded and machined for maximum durability, typically made not swaged with no holes for full surface applications.
  • Pre-Lubricated Operation: Concealed bearings are well lubricated ensuring smooth, long-lasting operation with minimal maintenance requirements.
  • Detention Hardware Series: Part of BEST's specialized detention hardware line engineered specifically for correctional facility requirements.

Technical Specifications

  • Bearing Type: Ball Bearing
  • Commercial/Residential: Commercial
  • Corner Style: Square Corners
  • Department: Door Hardware
  • Hinge Type: Full Surface
  • Knuckles: 3
  • Product Category: Door Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Model: BB855
  • Product Subgroup: Surface and Mortise Hinges
  • Product Type: Hinges
  • Series: Detention Hardware
  • Subcategory: Hinges

Installation & Operation

  1. Review manufacturer specifications and verify door preparation requirements including door thickness, weight capacity, and mounting surface compatibility for this heavy-duty hinge.
  2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and frame surfaces, ensuring proper alignment for smooth operation.
  3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions for full surface or full mortise applications.
  4. Install all mounting hardware and secure the hinge to door and frame per manufacturer torque specifications, ensuring adequate support for heavy door loads.
  5. Adjust operational components for proper alignment, smooth swing operation, and verify door closes properly without binding throughout the full range of motion.
  6. Test hinge operation under load conditions to verify proper function and make final adjustments as needed. Refer to manufacturer documentation for complete installation details and load specifications.

Professional Applications

  • Correctional Facilities and Detention Centers
  • High-Security Government Buildings
  • Mental Health Facilities
  • Courthouse Holding Areas
  • Prison and Jail Cell Doors
  • Lead-Lined X-Ray Room Doors
  • Maximum Security Access Points

Tamper-Resistant Design

The BB855 features concealed ball bearing construction that prevents access to moving components, eliminating potential tampering points. The welded and machined rolled knuckles provide additional security against forced entry attempts while maintaining smooth operation essential for high-security detention environments.

Why Choose BEST Quality?

BEST BB855 detention hinges deliver maximum security performance with double weight steel construction rated for doors up to 800 lbs. The concealed ball bearing system with sixteen hardened steel balls per race ensures reliable operation in the most demanding correctional environments. Engineered specifically for detention applications where tamper resistance and exceptional durability are critical requirements.

Product Specs

Subcategory:
Hinges
Series:
Detention Hardware
Hinge Type:
Full Surface
Knuckles:
3
Bearing Type:
Ball Bearing
Corner Style:
Square Corners
Product Group:
Door Hinges and Pivots
Product Subgroup:
Surface and Mortise Hinges
Product Type:
Hinges
Commercial/Residential:
Commercial
Product Model:
BB855
Product Category:
Door Hinges and Pivots
Department:
Door Hardware

BEST BEST-BB855-600-5x6 – Frequently Asked Questions

1) Does the BB855 hinge mortise into the door, or mount on the surface?
Full surface. Both leaves screw to the face of the door and the face of the frame, so there is no mortise pocket to rout on either side. That matters on hollow metal detention doors where you don't want to cut into the door edge. It's furnished not swaged with no holes, so the fixing pattern is drilled to suit the opening rather than coming pre-punched.
2) Why a concealed bearing hinge instead of a standard ball bearing hinge on a cell door?
Security. The BB855's bearings sit inside the knuckle, two hardened steel races each holding sixteen 1/8 inch (3.2mm) hardened and ground steel balls, so there is no exposed bearing race to attack or foul. The rolled knuckles are welded and machined for the same reason. An exposed ball bearing hinge carries the load fine but leaves accessible moving parts, which is what rules it out in a correctional opening.
3) I need a heavy duty concealed bearing hinge but my door isn't a detention door. What should I use instead of the BB855?
The BB855 is a full surface detention hinge and it's over-specified for an ordinary commercial opening. For a standard hollow metal or wood door with a mortised hinge prep, the Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with three knuckles, same bearing concept in a mortise format. If the traffic is lighter, the Ives 3CB1 is the medium duty version of the same hinge.
4) Can I run electric strike or lock power through the BB855 hinge?
No. The BB855 is a mechanical detention hinge with a concealed bearing assembly and no wire path through the knuckle. To transfer power through the hinge you need an electric through-wire hinge: Command Access ETH-BB68 is the heavy duty 5 knuckle steel base version, and the ETM-BB68 adds an integrated door position switch if you also need to monitor the door. Stanley's CECB1900R54L is a concealed conductor hinge, 4-1/2 by 4-1/2, square corner, left hand, 4-wire.
5) Is there a direct equivalent to the BEST BB855 double weight prison hinge?
Yes. The Stanley Security double weight prison hinge, furnished no holes and not swaged, is offered in 5 inch by 6 inch, the same size the BB855 comes in, and carries a heavy duty rating. Both are double weight prison hinges intended for the same detention openings, so if you are matching an existing set on a cell door, either part answers the same opening. Order the Stanley by its double weight prison hinge listing and the BEST by model BB855.
6) What is a lighter full surface prison hinge for a detention door that does not need 800 lb capacity?
The Hager 990 STEEL is a full surface prison hinge in 3 inch by 4 inch with a welded tip, rated heavy duty. It runs on plain bearings rather than the concealed ball bearing races the BB855 uses, and its 3 by 4 leaf is smaller than the BB855's 5 by 6. For a standard hollow metal detention or holding-area door where a double weight hinge is more than the opening calls for, the 990 STEEL is the full surface option; keep the BB855 where the door is lead lined or otherwise exceptionally heavy.
7) The door is mortised, not full surface - what heavy hinge goes in instead of the BB855?
The BB855 is a full surface hinge, so it will not drop into a door and frame prepped for a mortise hinge. For a full mortise prep, the Ives 3CB1HW is a steel heavy weight concealed bearing full mortise hinge with 3 knuckles, matching the BB855's 3 knuckle concealed bearing arrangement in a mortise body. The Don-Jo HWBB75045 is a heavy weight full mortise ball bearing hinge in 5 inch by 4-1/2 inch steel with a satin chrome finish if you want a ball bearing mortise hinge close to the BB855's 5 inch leaf height.
8) Will a heavy weight full mortise ball bearing hinge carry a lead lined x-ray door instead of the BB855?
The Don-Jo HWBB84545 is a heavy weight full mortise ball bearing hinge in 4-1/2 inch by 4-1/2 inch, and the Don-Jo HWBB85045 is a heavy weight full mortise ball bearing hinge in 5 inch by 4-1/2 inch brass, both satin chrome and both heavy duty. Heavy weight and double weight are not the same class: the BB855 is a double weight steel hinge rated to support doors up to 800 lbs based on a 3 foot by 7 foot door with 3 hinges, which is the range lead lined x-ray doors fall into. Specify the BB855 for the lead lined opening and the Don-Jo heavy weight hinges for the standard commercial doors around it.
9) What size is the BEST BB855 prison hinge and what finish does it come in?
One size, 5 x 6 inches, in 600 primed for painting. Primed means it arrives ready for the facility's paint spec rather than a plated architectural finish, which is normal on detention openings where the hinge gets painted with the door and frame. Corners are square, so it suits square-corner hollow metal work.
10) How many knuckles does the BEST BB855 have, and does that affect how it mounts?
Three knuckles. Fewer, thicker knuckles put more steel into each joint, which is how the hinge carries an 800 lb door. Practically it means the leaf pattern is different from a 5 knuckle hinge, so it won't line up with holes drilled for a 5 knuckle full surface hinge. Since it's furnished with no holes, the pattern gets set at install anyway.
11) Is the BEST BB855 hinge suitable for a residential or light commercial door?
No, and it would be the wrong buy. This is a commercial detention hinge, full surface, double weight, sized 5 x 6 inches for prison and x-ray room doors. For a residential or light interior door, a 3-1/2 x 3-1/2 or 4 x 4 hinge is the normal size: Delaney's 4 x 4 commercial ball bearing hinge with square corners, or the Emtek 94013 heavy duty ball bearing pair at 3-1/2 x 3-1/2 with square corners, are in the right range.
12) Can a security hinge with a non-removable pin be used in place of the BB855 on a detention door?
They solve different problems. The Hager BB1168 is a non-removable pin full mortise ball bearing heavy duty hinge, and the Deltana DE44R5TA is a 4 inch by 4 inch security hinge with 5/8 inch radius corners in steel, sold in pairs. Both defeat pin removal, but they are mortise hinges sized for standard commercial doors. The BB855 is a full surface double weight hinge with concealed bearing races and square corners, built for the door weights found on cell and lead lined openings. Use the NRP hinges on standard outswing exterior doors and the BB855 where the door weight and full surface prep drive the choice.
13) Which hinge should I use if the detention door needs power transferred to an electric lock?
The BB855 has no electrical path through it, so pair it with a separate transfer device or use an energy transfer hinge in one position. The Command Access ETH-BB68 is a heavy duty energy transfer hinge with a 5 knuckle steel base in the ETH 5 Series; the ETM-BB68 is the same heavy duty class with an integrated door position switch if you also need to monitor whether the door is closed. Both are medium and heavy duty commercial hinges rather than double weight prison hinges, so on a heavy cell door the usual approach is one transfer hinge carrying the wire and the load-bearing positions filled with the BB855.
14) Is a commercial ball bearing hinge like the Orca 4-1/2 inch the same thing as a double weight prison hinge?
No. The Orca Hardware 3535 Series is a 4-1/2 inch by 4-1/2 inch square corner ball bearing commercial hinge rated medium duty, and the Delaney CH401X is a 4 inch by 4 inch commercial ball bearing hinge with square corners. Both are ball bearing and square corner like the BB855, which is where the confusion comes from, but they are standard commercial mortise hinges. The BB855 is a double weight full surface hinge with concealed hardened steel bearing races. Matching on "ball bearing, square corner" alone will get you the wrong part for a detention opening.
15) What half mortise hinge works when the frame will not take a full surface hinge?
The Hager 1129 is a half mortise plain bearing commercial hinge, 4-1/2 inch standard weight steel, rated heavy duty. Half mortise mortises into the frame and applies to the door face, so it suits a door that cannot be routed while the frame can. The BB855 is a full surface hinge, applied to both the door and frame faces with no holes and not swaged, so it needs neither prepped but does need clear face on both. Confirm which faces are available before you specify.
16) Do the bearings on the BB855 need greasing after install?
No. The concealed bearings come lubricated from the factory and are sealed inside the knuckle, so there's no grease point to service. That's part of the point on a detention opening: nothing to access, nothing to maintain, nothing for an occupant to reach.
17) What documentation comes with the BEST BB855 for install and templating?
BEST publishes a detention hardware catalog, a general hinge information sheet, and a hinge installation instruction for this product. The install sheet and templates matter more than usual here, because the hinge ships not swaged and with no holes, so hole locations get marked from the template onto the door and frame face rather than dropping into an existing prep.
18) What concealed bearing hinge is right for the office and corridor doors in the same facility as the BB855 cell doors?
The Ives 3CB1 is a steel 3 knuckle concealed bearing full mortise hinge with a medium duty rating, and the Hager 920 is a full mortise concealed plain bearing hinge with 2 knuckle steel construction, also medium duty. Both give you concealed bearing operation like the BB855 on the administrative side of the building where doors are standard weight and full mortise prepped. Keeping concealed bearing throughout means the same smooth quiet swing across the facility while the BB855 stays on the heavy secure openings.
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Does the BEST BEST-BB855-600-5x6 come with a warranty?
Absolutely. The BEST BEST-BB855-600-5x6 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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