ABH A550HD Heavy Duty Aluminum...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$241.00
$236.83
ABH A550HD Heavy Duty Aluminum Continuous Gear Hinge Half Surface 450 lbs Capacity

ABH A550HD Heavy Duty Aluminum Continuous Gear Hinge Half Surface 450 lbs Capacity

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Model: A550 HD079 C
$241.00
$236.83
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$241.00
$236.83
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ABH A550HD Heavy Duty Aluminum Continuous Gear Hinge Half Surface 450 lbs Capacity

Professional Half Surface Continuous Hinge Solution

The ABH A550HD Heavy Duty Aluminum Continuous Gear Hinge delivers professional-grade performance for commercial door applications requiring superior weight capacity and alignment control. This half surface design supports doors up to 48" width and 450 lbs maximum weight, with BHMA Grade 1 certification ensuring reliable operation in demanding environments. Available in standard lengths from 79" to 120", the hinge features anodized aluminum construction and eliminates common door alignment issues through continuous weight distribution.

Professional Features & Benefits

  • Heavy-Duty Weight Capacity: Supports doors up to 450 lbs maximum weight and 48" door width for versatile commercial applications.
  • Continuous Weight Distribution: Eliminates door binding and sagging by evenly distributing weight throughout the entire door and frame length.
  • Enhanced Security Design: Eliminates gaps between door and frame to prevent prying attempts and unauthorized access.
  • BHMA Grade 1 Certification: Meets BHMA 156.25 Grade 1 standards for commercial-grade durability and performance.
  • Fire Rating Compliance: Approved for metal fire doors up to 90 minutes and wood fire doors up to 60 minutes rating.
  • Surface Application: No mortising required for door or frame installation, covering old butt hinge cut-outs.
  • Anodized Construction: Aluminum construction with post-machining anodization in clear, dark bronze, and black finishes.
  • Standard Length Options: Available in 79", 83", 85", 95" and 120" lengths with templated hole patterns for consistency.

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: Half Surface
  • Keyed: N/A
  • Keyed Function: N/A
  • Product Category: Door Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Model: A550HD
  • Product Subgroup: Continuous Hinges
  • Product Type: Continuous Hinges
  • Series: A550HD Series
  • Subcategory: Half Surface Model

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 ABH Quality?

ABH A550HD continuous hinges deliver professional-grade reliability with heavy-duty aluminum construction rated for 450 lbs door weight capacity and BHMA Grade 1 certification. The anodized finish and fire rating approvals demonstrate engineered quality for demanding commercial applications where dependable performance and 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:
Half Surface Model
Commercial/Residential:
Commercial
Hinge Type:
Half Surface
Keyed:
N/A
Keyed Function:
N/A
Series:
A550HD Series
BAA Qualified:
Yes
Product Model:
A550HD
Product Category:
Door Hinges and Pivots
Department:
Door Hardware

ABH A550 HD079 C – Frequently Asked Questions

1) Will the ABH A550HD continuous hinge work on a door that's already been hung on butt hinges?
Yes, and it covers the old butt hinge cutouts. The A550HD is a half surface hinge, so it surface applies without mortising the door or the frame. The leaf spans the full height, so the existing butt prep on the door edge and jamb ends up hidden behind it. That is the usual reason people move to a continuous gear hinge on a retrofit: the door has been sagging and the butt cutouts are chewed out, and you don't want to re-prep or replace the frame.
2) How heavy a door will the ABH A550HD hinge carry?
450 lbs is the maximum door weight, on doors up to 48 inches wide. That covers most commercial hollow metal and heavy wood openings, including lead lined and oversized doors that eat butt hinges. Because the gear hinge carries the load along the whole height of the door rather than at three or five points, the weight is spread into the frame instead of concentrated at the top hinge, which is what stops the sag from coming back.
3) Is the ABH A550HD hinge approved for use on a fire rated door?
Yes. The A550HD is approved for metal fire doors up to 90 minutes and wood fire doors up to 60 minutes. If your opening is a 90 minute wood door, this is not the right hinge for it. It also carries BHMA 156.25 Grade 1 certification, which is the top durability grade for continuous hinges and what most institutional and government specs call out.
4) Will the ABH A550HD hinge work on a double egress frame?
Yes. Every A550HD ordered is configured for double egress and center hung doors, across all five lengths and all three finishes. Double egress pairs are common in hospital corridors and stair vestibules, where each leaf swings the opposite way in the same frame, and the hinge geometry has to suit that inset rather than a standard single-swing rabbet.
5) My door is 52 inches wide. Can I still use the ABH A550HD?
No. The A550HD is rated to 48 inches of door width, and going wider puts leverage on the hinge beyond what it's rated for regardless of how much the door weighs. Wide leaves need a hinge rated for that width, not just for the weight. Stay within 48 inches and 450 lbs and you're inside the rating.
6) Is a full surface continuous geared hinge the same thing as the ABH A550HD half surface?
No. The A550HD is a half surface hinge, meaning one leaf goes on the face of the door or frame and the other into the opposite member. A full surface hinge puts both leaves on the face. Full surface peers include the BEST 664HD heavy duty full surface continuous geared hinge with a 90 minute UL fire rating, the Design Hardware FSHD, and the NGP HD5700, an 83 inch full surface geared hinge with 1/16 inch door inset for 1-3/4 to 2-1/4 inch doors and a 10C 90 minute hollow metal fire rating. Confirm which face the existing prep and door construction will take before ordering across that line, because the two mount differently on the same opening.
7) What is the closest equivalent to the ABH A550HD half surface continuous geared hinge from another manufacturer?
The NGP HD5400A is the nearest match in the same configuration: a half surface continuous geared hinge in aluminum alloy, listed at 83 inches, and 10C fire rated for 90 minutes on hollow metal. The A550HD is also a half surface geared hinge, carries approval for metal fire doors up to 90 minutes, and comes in 79, 83, 85, 95 and 120 inch lengths, so an 83 inch NGP unit lines up directly with the 83 inch A550HD. If the opening already has butt hinge cut-outs, either one covers them without mortising, since both mount to the face of the door and frame.
8) The frame is prepped for a mortised continuous hinge, not a surface applied one. What continuous hinge should I use instead of the A550HD?
The A550HD is a half surface hinge that mounts without mortising the door or frame, so it is the wrong choice where the prep expects a mortised leaf. Full mortise options include the Design Hardware FMHD heavy duty continuous geared hinge, the Pemko FM-RG Series Grade 1 aluminum full mortise raised geared hinge with 180 degree swing, and the Pemko CFM84SLF-HD1, an 84 inch full mortise short leaf flush hinge rated Grade 1. The Pemko FM-SLF short leaf flush geared hinge is the one to look at when the door is 1-3/8 inch thick, since it is built for that thickness.
9) Which continuous geared hinges besides the ABH A550HD are certified Grade 1?
The A550HD meets BHMA 156.25 Grade 1. Among comparable continuous hinges, the Pemko FM-RG Series aluminum full mortise raised geared hinge, the Pemko CFM84SLF-HD1 84 inch full mortise short leaf flush hinge, the Pemko FM-SLF short leaf flush geared hinge, and the Pemko DSH1000 anti-barricade hinge are all Grade 1. The NGP HD1100A concealed continuous geared hinge is Grade 3. For a facility standardizing on a Grade 1 spec across a hinge schedule, that distinction is the one to check against the drawing.
10) Can I use the ABH A550HD on a behavioral health door that needs anti-barricade operation?
No. The A550HD is a half surface geared hinge for standard commercial swing, with no bidirectional feature. The Pemko DSH1000 is the anti-barricade continuous hinge, with 100 degree bidirectional operation and a Grade 1 rating, which is what lets staff open the door from the corridor when it has been blocked from inside. That behavior is not something the A550HD substitutes for, even though both are continuous hinges.
11) Which heavy duty continuous geared hinges are alternatives to the ABH A550HD on a fire rated opening?
On the fire side, the A550HD is approved for metal fire doors up to 90 minutes and wood fire doors up to 60 minutes. Comparable hinges carrying a 90 minute fire rating include the BEST 663HD and BEST 664HD, both heavy duty with 90 minute UL fire ratings, and the NGP HD5400A and NGP HD5700, both 10C fire rated 90 minute on hollow metal. The mounting style is what separates them: the A550HD and HD5400A are half surface, the 664HD and HD5700 are full surface, so confirm the opening's prep alongside the rating.
12) Is the ABH A550HD hinge Buy American compliant for a government job?
It's BAA qualified, so it can go on federal work carrying Buy American Act requirements. Paired with the BHMA 156.25 Grade 1 certification, that covers the two things a government or municipal spec writer usually checks first on a continuous hinge.
13) Does the ABH A550HD hinge come with screws, or do I need to buy fasteners separately?
Fasteners are 12-24 x 3/4 inch undercut self drilling, thread forming tek machine screws. Self drilling and thread forming means you're going into hollow metal without pre-tapping, which is why the install goes quickly on a retrofit. The hole pattern is templated across the length options, so multiple doors in a building drill the same way.
14) Can I standardize on the ABH A550HD across a whole building, or do I need different hinges per door?
For a fleet of commercial openings it standardizes well. One hinge type covers doors up to 450 lbs and 48 inches wide across five lengths, with a templated hole pattern so the install is the same on every door and stock parts interchange. Where it stops working is a 90 minute wood fire door (the wood rating tops out at 60 minutes) or a frame that can't take the frame leaf, in which case a full surface geared hinge like the Design Hardware FSHD covers those specific openings.
15) Is a continuous geared hinge more secure than butt hinges on an exterior door?
It closes the gap. Because the A550HD runs the full height of the opening, there is no space between the door and frame at the hinge side for a pry bar to get into, and no exposed hinge pins to pull. Butt hinges leave open stretches between each leaf that a pry bar can reach. That, plus the fact that the load is distributed rather than concentrated on three points, is why geared hinges get specified on high-traffic and high-abuse entries.
16) I need a continuous hinge but my door and frame can both be machined. Should I use the A550HD or a full mortise hinge?
If you can prep both the door edge and the jamb rabbet, a full mortise hinge gives you a concealed installation with nothing showing on the face of the door. The Design Hardware FMHD and the Pemko FM-RG Series are heavy duty full mortise geared options, and the Pemko FM-SLF short leaf flush is built for 1-3/8 inch doors. The A550HD's advantage is that it needs no mortising at all, which is what you want on an existing opening or where you don't want to pull the door for machining.
17) The door swings past an obstruction and needs the pivot point moved off the frame face. What continuous hinge handles that instead of the A550HD?
The A550HD is a half surface hinge without an offset leaf, so it hangs the door tight to the frame. For an opening that needs the door thrown clear, the Design Hardware FSOHD is a full surface offset heavy duty continuous geared hinge, which moves the hinge line away from the frame face. Note that it is a full surface mount, so the prep differs from the half surface A550HD and both faces have to be available.
18) I only need a continuous hinge for a light interior door. Is there a lighter duty option than the ABH A550HD?
The A550HD is built for doors up to 450 lbs and 48 inch width. For a lighter opening, the BEST 641 steel full mortise continuous hinge with hospital tips and the BEST 651 stainless steel full mortise continuous hinge with hospital tips are both medium duty. Both are full mortise, so they need mortised prep on the door and frame rather than the surface application the A550HD uses, and the hospital tips give a sloped end that will not catch on gowns or IV lines in a healthcare corridor.
19) The architect wants the hinge hidden when the door is closed. Does the ABH A550HD do that?
The A550HD is a half surface hinge, so a leaf sits on the face of the door and stays visible. When the drawing calls for the hinge out of sight, the NGP HD1100A is a concealed continuous geared hinge, offered at 83 inches, 10C fire rated 90 minutes on hollow metal, and rated Grade 3. If the same schedule also calls for BHMA Grade 1, that is the point where the concealed option and the A550HD part ways.
20) I need a continuous hinge for a 1-3/8 inch door. Will the ABH A550HD work?
For a 1-3/8 inch door, the Pemko FM-SLF short leaf flush continuous geared hinge is the one built to that thickness, with Grade 1 construction. The A550HD is a half surface hinge for commercial openings up to 48 inch door width and 450 lbs, mounted to the face rather than mortised, which is a different install than the FM-SLF. On a thin door where the leaf has to sit flush in a mortise, the short leaf flush hinge is the specified part.
21) We need a Buy American qualified continuous hinge for a federal project. How does the ABH A550HD compare to other heavy duty geared hinges?
The A550HD is BAA qualified, meets BHMA 156.25 Grade 1, and is a commercial half surface aluminum geared hinge available in 79, 83, 85, 95 and 120 inch lengths in clear anodized, dark bronze and black. Other heavy duty continuous geared hinges in the same class include the Design Hardware FMHD full mortise and FSHD full surface, and the BEST 663HD and 664HD, all heavy duty. Where a federal spec pairs a domestic sourcing requirement with a Grade 1 line item, the A550HD covers both in one part.
22) What finishes does the ABH A550HD hinge come in, and will it hold up outdoors?
Three finishes: clear anodized aluminum, dark bronze, and black. The anodizing is applied after machining, so the cut edges and drilled holes are sealed rather than left as bare aluminum. Clear and dark bronze are the two that typically match existing aluminum storefront and entrance framing, which is what most people are trying to blend with on a glass front or a lobby door.
How fast can I get the ABH A550 HD079 C 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 A550 HD079 C come with a warranty?
Absolutely. The ABH A550 HD079 C 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 A550 HD079 C?
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
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