ABH A120HD Heavy Duty Aluminum...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$171.00
$133.49
ABH A120HD Heavy Duty Aluminum Continuous Gear Hinge Full Mortise with Easy Install Technology

ABH A120HD Heavy Duty Aluminum Continuous Gear Hinge Full Mortise with Easy Install Technology

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Model: A120HD C79
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$171.00
$133.49
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ABH A120HD Heavy Duty Aluminum Continuous Gear Hinge Full Mortise with Easy Install Technology

Professional Continuous Hinge Solution with Vertical Adjustability

The ABH A120HD Heavy Duty Aluminum Continuous Gear Hinge delivers professional-grade performance with innovative Easy Install technology that allows vertical adjustability after installation. This full mortise continuous hinge supports doors up to 48" width and 450 lbs. weight capacity with BHMA Grade 1 certification. The 1/8" door inset design provides enhanced security by eliminating gaps between door and frame while distributing weight evenly throughout the entire door height.

Professional Features & Benefits

  • Door Capacity: Supports doors up to 48" width and 450 lbs. maximum weight for heavy-duty commercial applications.
  • Easy Install Technology: Allows vertical adjustability after hinge installation, reducing installation time and cost while ensuring proper alignment.
  • Heavy-Duty Construction: Full concealed aluminum construction with gear mechanism and 32 bearings on 83" hinge (3" spacing on center) for smooth operation.
  • Enhanced Security Design: 1/8" door inset eliminates gaps between door and frame, preventing prying attempts and improving security.
  • Fire Rating Compliance: Approved for metal fire doors up to 90 minutes and wood fire doors up to 60 minutes for code compliance.
  • BHMA Grade 1 Certification: BHMA 156.25 Grade 1 certified for commercial-grade durability and performance standards.
  • Surface Applied Installation: No mortising of door or frame required, covers old butt hinge cut-outs for retrofit applications.
  • Standard Fasteners Included: 12-24 X 3/4" undercut self drilling, thread forming tek machine screws for secure mounting.

Technical Specifications

  • BAA Qualified: Yes
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Door Weight: 450
  • Fasteners: 12-24 X 3/4" undercut self drilling, thread forming tek machine screws
  • Hinge Type: Full Mortise
  • PDF:A120HD "EA" Option, Easy Access Concealed Electrification with Frame MTG Slots for Easy Install Aluminum Continuous Gear Hinges Full Mortise: https://zensupply.com/content/pdf/abh/0002527_a120_ea_option_easy_access_concealed_electrification_with_frame_mtg_slots_1_2_00.pdf
  • PDF:A120HD Aluminum Continuous Gear Hinges Full Mortise - Cut Sheet: https://zensupply.com/content/pdf/abh/0002400_a120_cut_sheet_2020.pdf
  • PDF:A120HD Easy Install Aluminum Continuous Gear Hinges Full Mortise with Frame MTG Slots: https://zensupply.com/content/pdf/abh/0002401_a120_aluminum_geared_hinge_with_frame_mtg_slots_01.pdf
  • Product Category: Door Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Model: A120HD
  • Product Subgroup: Continuous Hinges
  • Product Type: Continuous Hinges
  • Series: A120HD Series
  • Subcategory: Full Mortise Hinges

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Industrial and Warehouse Facilities
  • Fire-Rated Door Applications
  • High-Security Commercial Entrances
  • Heavy-Duty Door Retrofit Projects

Why Choose ABH Quality?

ABH A120HD continuous hinges deliver professional-grade reliability with heavy-duty aluminum construction rated for 450 lbs. door weight and BHMA Grade 1 certification. The innovative Easy Install technology with post-installation vertical adjustability reduces installation time while ensuring proper door alignment. Engineered for demanding commercial applications where dependable performance and enhanced security are essential.

Product Specs

Product Group:
Door Hinges and Pivots
Door Weight:
450
Fasteners:
12-24 X 3/4" undercut self drilling, thread forming tek machine screws
Product Subgroup:
Continuous Hinges
Product Type:
Continuous Hinges
Subcategory:
Full Mortise Hinges
Commercial/Residential:
Commercial
Hinge Type:
Full Mortise
Series:
A120HD Series
BAA Qualified:
Yes
Product Model:
A120HD
Product Category:
Door Hinges and Pivots
Department:
Door Hardware

ABH A120HD C79 – Frequently Asked Questions

1) Will the ABH A120HD continuous hinge work on a 450 lb solid core door?
Yes. The A120HD is rated to 450 lbs and doors up to 48 inches wide, which is where a continuous geared hinge earns its keep: the load rides the full height of the door instead of concentrating on three or four butt hinge points. That is the case for wide, heavy openings like warehouse man doors and institutional entrances that eat butt hinges.
2) Can I use the ABH A120HD on a 90 minute fire rated door?
On metal fire doors, yes, up to 90 minutes. On wood fire doors the approval stops at 60 minutes, so a 90 minute wood door assembly needs different hardware. The hinge is also BHMA 156.25 Grade 1 certified.
3) Will an ABH A120HD cover the old butt hinge cutouts when I replace butt hinges?
It does. The A120HD mounts surface applied with no new mortising of the door or frame, and the leaf covers existing butt hinge cut outs. That is the usual retrofit move on a sagging commercial door: strip the butts, hang the continuous hinge over the damaged edge, and you get a fresh bearing surface without replacing the door or the frame.
4) Is the ABH A120HD Buy American Act compliant for a government job?
Yes, the A120HD is BAA qualified, so it clears Buy American Act sourcing requirements on federal and federally funded work. It is a commercial duty product, which is the spec level most GSA and municipal door schedules call for.
5) Should I use a full mortise continuous hinge or a full surface one?
Full mortise, which is what the A120HD is, mounts between the door edge and the frame rabbet and stays concealed when the door is closed, so it suits new hollow metal frames and openings where you want a clean look and a tight gap. Full surface hinges wrap the face of the door and frame instead and are the choice when the door edge or frame rabbet is too chewed up to take a mortise leaf. ZenSupply carries full surface options such as the Design Hardware FSHD and the BEST 664HD, plus the Design Hardware FSOHD offset version for doors that must swing clear of a wall or a bank of them.
6) How does the 1/8 inch door inset on the ABH A120HD affect security?
The A120HD is built around a 1/8 inch door inset, which closes the gap between the door edge and the frame along the full hinge height. Less gap means less room to get a pry bar in at the hinge side. Worth noting when you are matching an existing opening: inset is not universal across continuous hinges. The BEST 663HD, for instance, is built for 3/32 inch inset doors and the NGP HD5700 for 1/16 inch, so measure your existing gap before you assume one drops in for the other.
7) Can I run wiring through the ABH A120HD for an electric strike or electrified lock?
Yes, via the EA option, ABH's Easy Access concealed electrification for the A120HD full mortise hinge, which also includes frame mounting slots. That is how you get power from the frame to an electrified lever, exit device, or door position switch without a separate power transfer loop on the hinge side. Specify the EA option when ordering rather than adding it later.
8) I need a Grade 1 continuous hinge for a spec, is the ABH A120HD Grade 1?
The A120HD carries BHMA 156.25 Grade 1 certification, so it meets a Grade 1 line item on a door hardware schedule. Not every continuous geared hinge does. The NGP HD1100A concealed geared hinge, for example, is Grade 3, so it will not satisfy a Grade 1 spec even though it is described as heavy duty.
9) Which continuous geared hinges besides the ABH A120HD carry a Grade 1 rating for a spec that calls it out?
Pemko lists Grade 1 on several continuous geared hinges: the CFM84SLF-HD1 84 inch full mortise short leaf flush heavy duty hinge, the FM-RG Series aluminum full mortise raised geared hinge with 180 degree swing, the FM-SLF short leaf flush geared hinge for 1-3/8 inch doors, and the DSH1000 anti-barricade hinge with 100 degree bidirectional operation. The ABH A120HD is BHMA 156.25 Grade 1 certified as well, so for a facility standardizing on Grade 1 continuous hinges any of these satisfies the grade line on the spec; the choice then comes down to mounting type and door thickness.
10) What is the closest full mortise geared continuous hinge to the ABH A120HD if the A120HD is not the right fit?
The Design Hardware FMHD is the nearest match in configuration and duty: it is a full mortise continuous geared hinge rated heavy duty, the same mounting family and duty level as the A120HD, which is a full mortise hinge rated for 450 lb doors. Pemko also builds a Grade 1 aluminum full mortise geared hinge in the FM-RG Series, which is a raised geared design with a 180 degree swing rather than the A120HD concealed gear arrangement. Both mount into the same door and frame edge condition the A120HD uses, so the opening prep does not change.
11) The door edge and frame will not take a mortise hinge - what geared continuous hinge do I use instead of the ABH A120HD?
Go to a full surface hinge, which mounts on the face of the door and frame instead of into the mortise. Design Hardware FSHD is a full surface heavy duty continuous geared hinge, and the FSOHD is the full surface offset version for openings where the door is offset from the frame face. BEST 664HD is a full surface heavy duty continuous geared hinge carrying a 90 minute UL fire rating, and NGP HD5700 is a full surface geared hinge with 1/16 inch door inset sized for 1-3/4 inch to 2-1/4 inch doors. The A120HD is a full mortise hinge with a 1/8 inch door inset, so it needs the mortised edge condition these do not.
12) Is the BEST 663HD a drop-in replacement for the ABH A120HD?
Not on door inset. The BEST 663HD is a heavy duty continuous hinge, 90 minute UL fire rated, built for 3/32 inch inset doors, while the A120HD is designed around a 1/8 inch door inset. Both are heavy duty geared continuous hinges and both carry a 90 minute rating on metal fire doors, so on duty and fire code they line up, but the inset difference means the door-to-frame clearance has to be confirmed before swapping one for the other on an existing opening.
13) What is the difference between the ABH A120HD and the NGP HD1100A concealed geared hinge?
Both are concealed continuous geared hinges in an 83 inch length. The ABH A120HD is BHMA 156.25 Grade 1 certified and approved for metal fire doors up to 90 minutes and wood fire doors up to 60 minutes; the NGP HD1100A is listed as Grade 3 and 10C fire rated for 90 minutes on hollow metal. If the submittal calls for a Grade 1 concealed hinge, that is the line that separates them. NGP also offers the HD5400A, a half surface geared hinge in aluminum alloy at 83 inches with the same 10C 90 minute hollow metal rating, for openings where a half surface mount is required instead of a mortise.
14) I need a continuous hinge for a behavioral health room where the door cannot be barricaded - is the ABH A120HD the right choice?
For that specific condition, the Pemko DSH1000 is the purpose-built option: it is an anti-barricade continuous hinge with 100 degree bidirectional operation, so the door can swing either way, and it is Grade 1. The ABH A120HD is a conventional full mortise heavy duty geared hinge for 450 lb commercial doors and does not offer bidirectional swing. In healthcare corridors where the requirement is hospital tips rather than bidirectional swing, the BEST 641 and BEST 651 full mortise hinges carry hospital tips.
15) Can I substitute the Pemko CFM84SLF-HD1 for an ABH A120HD on an 85 inch door?
Length is the constraint. The Pemko CFM84SLF-HD1 is an 84 inch full mortise short leaf flush heavy duty Grade 1 hinge, a fixed 84 inch length. The ABH A120HD comes in 79, 83, 85, 95 and 120 inch lengths, so for an opening that needs 85 inches or longer the A120HD covers it directly. Both are full mortise heavy duty Grade 1 hinges, so on an 84 inch opening they are close peers; above that, the length options decide it.
16) What does Easy Install mean on the ABH A120HD hinge, and does it help if my door is out of alignment?
Easy Install means the hinge allows vertical adjustability after it is installed. You can hang the door, check the reveal at the head, and raise or drop it without pulling the hinge back off the frame. On a retrofit where the frame has settled or the old butt prep is worn oversized, that is what saves the second trip.
17) What screws come with the ABH A120HD continuous hinge, or do I need to order fasteners?
Fasteners ship with it: 12-24 x 3/4 inch undercut self drilling, thread forming tek machine screws. Self drilling means you are not pre-tapping the hollow metal frame or door face, which is most of why a continuous hinge install goes fast.
18) How many bearings does the ABH A120HD have and will it hold up on a high traffic door?
An 83 inch A120HD carries 32 bearings at 3 inch spacing on center, running the full height of the door. That bearing count plus BHMA 156.25 Grade 1 certification is what puts it on high cycle openings, school corridors, hospital doors, warehouse entries, where three butt hinges wear out and the door starts dragging.
19) Can I standardize the ABH A120HD across every door in a building?
Across most of them, within limits. The A120HD covers doors up to 48 inches wide and 450 lbs in five lengths from 79 to 120 inches, and the same three finishes, Clear Anodized Aluminum, Dark Bronze, and Black, run across every length, so the openings all match visually. Two things break the pattern: wood fire doors above 60 minutes, and any opening where the door edge or frame rabbet is too damaged for a mortise leaf, which wants a full surface hinge instead.
20) My opening is a light interior door that does not need the ABH A120HD heavy duty rating - what is the lighter continuous hinge?
BEST 641 is a steel full mortise standard duty continuous hinge with hospital tips, rated medium duty, and BEST 651 is the stainless steel full mortise version with hospital tips, also rated medium duty. Both are full mortise like the A120HD, so the door edge prep is the same family, but they step down from the heavy duty class the A120HD sits in at 450 lb door capacity. The hospital tip ends on the BEST hinges are the detail to note for healthcare and behavioral health openings.
21) The door is 1-3/8 inch thick - can I use the ABH A120HD or do I need a different continuous hinge?
For a 1-3/8 inch door, Pemko builds the FM-SLF short leaf flush continuous geared hinge specifically for that thickness, in Grade 1 construction. The ABH A120HD is a full mortise heavy duty hinge built around 450 lb doors up to 48 inches wide, which is a thicker, heavier commercial leaf than a 1-3/8 inch door. Confirm the leaf against the actual door thickness before ordering either one.
22) Does the ABH A120HD or a stainless steel continuous hinge suit a washdown or coastal opening better?
The BEST 651 is a stainless steel full mortise continuous hinge with hospital tips at a medium duty rating, and BEST 641 is the steel version of the same full mortise standard duty configuration. The ABH A120HD is aluminum construction, full mortise, rated for 450 lb doors and BHMA Grade 1. Material is the deciding factor here: stainless steel and aluminum behave differently in wet and salt-air environments, so match the leaf material to the exposure and then confirm the duty class the opening needs.
How fast can I get the ABH A120HD C79 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 ABH A120HD C79 come with a warranty?
Absolutely. The ABH A120HD C79 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 ABH A120HD C79?
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 ABH A120HD C79 from ZenSupply?
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