ABH A571HD Heavy Duty Aluminum...
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$206.00
$202.43
ABH ABH A571HD Aluminum Continuous Gear Hinges Full Surface ABH-A571HD

ABH A571HD Heavy Duty Aluminum Continuous Gear Hinge Full Surface BHMA Grade 1

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Model: A571 HD079 C
$206.00
$202.43
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ABH A571HD Heavy Duty Aluminum Continuous Gear Hinge Full Surface BHMA Grade 1

Professional Full Surface Continuous Hinge Solution

The ABH A571HD Heavy Duty Aluminum Continuous Gear Hinge delivers professional-grade performance for commercial door applications requiring maximum durability and security. This BHMA Grade 1 certified full surface hinge supports doors up to 48" width and 450 lbs. weight capacity, with standard lengths available in 79", 83", 85", 95" and 120" configurations. Fire rated for metal doors up to 90 minutes and wood doors up to 60 minutes, this continuous hinge eliminates common alignment problems while providing enhanced security through gap elimination.

Professional Features & Benefits

  • Heavy Duty Load Capacity: Supports doors up to 450 lbs. weight and 48" maximum width for demanding commercial applications.
  • BHMA Grade 1 Certification: BHMA 156.25 Grade 1 certified construction ensures professional-grade durability and performance standards.
  • Fire Rating Compliance: Approved for metal swinging fire doors up to 90 minutes and wood swinging fire doors up to 60 minutes.
  • Full Surface Installation: Surface-applied design requires no mortising of door or frame, simplifying installation and covering old butt hinge cut-outs.
  • Enhanced Security Design: Continuous construction eliminates gaps between door and frame, preventing prying attempts and improving security.
  • Weight Distribution Technology: Continuous design evenly distributes door weight throughout entire length, preventing door binding and sagging.
  • Anodized Aluminum Construction: Anodized after machining with standard finishes including clear anodized, dark bronze anodized, and black anodized.
  • Templated Hole Patterns: Standard-length hinges feature templated hole patterns for consistent installation over time.

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 Surface
  • Keyed: N/A
  • Keyed Function: N/A
  • Product Category: Door Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Model: A571HD
  • Product Subgroup: Continuous Hinges
  • Product Type: Continuous Hinges
  • Subcategory: Full 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 A571HD continuous hinges deliver professional-grade reliability with anodized aluminum construction and BHMA Grade 1 certification for demanding commercial applications. Heavy duty performance at standard duty prices, with fire rating approvals and templated hole patterns ensuring consistent installation quality. 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 Surface Model
Commercial/Residential:
Commercial
Hinge Type:
Full Surface
Keyed:
N/A
Keyed Function:
N/A
BAA Qualified:
Yes
Product Model:
A571HD
Product Category:
Door Hinges and Pivots
Department:
Door Hardware

ABH A571 HD079 C – Frequently Asked Questions

1) Do I have to mortise the door or frame to install an A571HD geared hinge?
No mortising. The A571HD is a full surface hinge, so both leaves screw to the face of the door and the face of the frame. That is the main reason it gets specified on retrofits: it covers the old butt hinge cut-outs instead of requiring you to fill and re-prep them, and it works on a frame that has already been chewed up by a failed set of butts.
2) Can I use the ABH A571HD on a 90 minute fire rated opening?
On metal swinging fire doors it is approved up to 90 minutes. On wood swinging fire doors the approval stops at 60 minutes, so a 90 minute wood opening is outside what this hinge is listed for. It is BHMA 156.25 Grade 1 certified.
3) What else can I buy instead of the ABH A571HD if I need a full surface continuous geared hinge?
Two direct full surface alternatives are the BEST 664HD heavy duty full surface continuous geared hinge with a 90 minute UL fire rating, and the Design Hardware FSHD heavy duty full surface geared hinge. Both are heavy duty like the A571HD. If your door sits inset in the frame rather than flush, the Design Hardware FSOHD is the full surface offset version, and the NGP HD5700 is a full surface unit built around a 1/16 inch door inset for 1-3/4 to 2-1/4 inch doors.
4) Can a continuous geared hinge like the A571HD replace the butt hinges on an existing door?
That is the common use for it. Because it is full surface, you unhang the door, leave the existing butt hinge cut-outs in place, and screw the hinge to the faces of the door and frame; the hinge body covers the old preps. The self drilling tek screws mean no re-tapping of a hollow metal frame. Confirm your leaf is within 450 lbs and 48 inches wide, and pick the hinge length that suits your door height from the 79, 83, 85, 95 and 120 inch range.
5) The door is mortised for a full mortise continuous hinge, not surface applied. What should I order instead of the A571HD?
Go to a full mortise geared hinge. The A571HD is full surface, so its leaves sit on the face of the door and frame and will not drop into a mortise prep. Full mortise options include the Design Hardware FMHD Full Mortise Heavy Duty Continuous Geared Hinge, the Pemko FM-RG Series Grade 1 aluminum full mortise raised geared hinge with 180-degree swing, the Pemko 84-inch full mortise short leaf flush heavy duty Grade 1 hinge, and the BEST 651 stainless steel full mortise continuous hinge with hospital tips. Matching the prep is the whole job here - a full surface hinge on a mortised opening leaves the frame cutout exposed and the leaves standing proud.
6) What is the equivalent to an ABH A571HD full surface continuous geared hinge from another manufacturer?
The closest straight equivalents are the BEST 664HD Heavy Duty Full Surface Continuous Geared Hinge with 90-Minute UL Fire Rating, the Design Hardware FSHD Full Surface Heavy Duty Continuous Geared Hinge, and the NGP HD5700 83-inch Full Surface Continuous Geared Hinge. All three are full surface geared hinges in the heavy duty class, matching the A571HD's full surface hinge type and 450 lb door weight rating. Full surface is the deciding attribute: it mounts to the face of the door and frame with no mortising, so it covers existing butt hinge cutouts on a retrofit. If your opening is already prepped for full surface, any of these three lands in the same place on the door.
7) The door has an inset and the A571HD is specified with no inset. What continuous hinge handles an inset door?
Two peers are built for inset openings. The BEST 663HD Heavy Duty Continuous Hinge is 90-minute UL fire rated for 3/32-inch inset doors, and the NGP HD5700 full surface geared hinge carries a 1/16-inch door inset for 1-3/4 to 2-1/4 inch doors. The A571HD is ordered with a door inset of None, so on an opening where the door sits recessed into the frame, one of those inset-specific models is the match. Confirm the actual inset dimension at the opening before ordering - 3/32 and 1/16 inch are not interchangeable.
8) Is the NGP HD5400A a substitute for the ABH A571HD?
No, and the names read closer than the parts are. The NGP HD5400A is a half surface continuous geared hinge in aluminum alloy, 83 inches, 10C fire rated 90 minutes on hollow metal. Half surface means one leaf mortises into the frame while the other applies to the door face. The ABH A571HD is full surface - both leaves apply to the face, no mortising of door or frame. A half surface hinge needs frame prep the A571HD does not, so swapping one for the other changes what the installer has to cut. Match the hinge to the prep that exists at the opening.
9) We need an anti-barricade hinge for a behavioral health or detention opening. Does the A571HD do that?
No. For that application the part is the Pemko DSH1000 Anti-Barricade Continuous Hinge, a Grade 1 hinge with 100-degree bidirectional operation, which lets the door swing both directions so an occupant cannot block it closed. The ABH A571HD is a standard-swing full surface geared hinge - it is BHMA 156.25 Grade 1 and rated to 450 lb, but it swings one direction and offers no anti-barricade function. On a behavioral health room the swing behavior is the requirement, not the load rating.
10) Which heavy duty continuous hinges are fire rated for a 90 minute opening?
The ABH A571HD is approved for metal swinging fire doors up to 90 minutes and wood swinging fire doors up to 60 minutes. Peers carrying a 90 minute rating include the BEST 664HD full surface geared hinge with 90-minute UL fire rating, the BEST 663HD heavy duty hinge 90-minute UL fire rated for 3/32 inch inset doors, and three NGP models rated 10C fire rated 90 minute on hollow metal: the HD1100A concealed, the HD5400A half surface, and the HD5700 full surface. The NGP ratings are stated on hollow metal specifically, so on a wood fire door the A571HD's 60 minute wood approval is the figure to check against the door label.
11) What fasteners come with the A571HD and do I need to drill and tap the frame first?
It ships with 12-24 x 3/4 inch undercut self drilling, thread forming tek machine screws. Self drilling and thread forming means you go straight into hollow metal without pre-drilling or tapping, which is the whole install on a typical hollow metal frame and door. Standard-length hinges are templated, so the hole pattern repeats openings to opening.
12) I have a hospital corridor door, is there a version of the A571HD without the pinch point at the ends?
ABH publishes an AHT option, the Advanced Hospital Tip, for the A571HD. Hospital tips close off the ends of the hinge so gurneys, IV poles and sleeves don't catch, which is what healthcare and behavioral facilities usually require on patient-side doors. Specify AHT with the hinge rather than trying to add it later.
13) Is the ABH A571HD Buy American compliant for a federal or municipal job?
The A571HD is BAA qualified, so it can be carried on Buy American Act jobs, and it is a commercial-duty product rather than a residential one. That combination plus BHMA 156.25 Grade 1 is normally what a government or school spec is looking for on a continuous hinge line item.
14) Will an aluminum geared hinge hold up on a high traffic commercial entrance, or should it be steel?
The A571HD is anodized aluminum, and it is BHMA 156.25 Grade 1, the top durability tier BHMA certifies for hinges, at a 450 lb rating. The geared design carries the load along the entire door edge instead of at a few knuckles, which is what keeps a high-cycle door from sagging. Where a job specifically calls for steel or stainless, the BEST 641 is steel and the BEST 651 is stainless steel, both full mortise.
15) Is there a lighter duty continuous hinge than the ABH A571HD for a door that does not need 450 pounds of capacity?
Yes. The BEST 641 Steel Full Mortise Standard Duty Continuous Hinge with Hospital Tips and the BEST 651 stainless steel full mortise continuous hinge are both medium duty, against the A571HD's heavy duty 450 lb door weight rating. Both 641 and 651 are full mortise, so the trade is not only duty level - you would be changing the door and frame prep as well as the capacity. For an interior office or classroom door in the medium duty range that is already mortised, the 641 in steel or the 651 in stainless is the lighter answer.
16) What continuous geared hinge should I use if the hinge needs to be concealed rather than visible on the face of the door?
The NGP HD1100A Concealed Continuous Geared Hinge, 83 inches, is the concealed option in the geared hinge family. It is 10C fire rated for 90 minutes on hollow metal and carries a Grade 3 rating. The ABH A571HD is a full surface hinge - the leaves are visible on the door and frame face by design, which is what lets it cover old butt hinge cutouts. Where the architect wants no visible hinge on the exterior face, the concealed HD1100A is the different construction, and the Grade 3 rating against the A571HD's BHMA 156.25 Grade 1 is the specification difference to put in front of whoever approves the submittal.
17) I need a continuous hinge for a door that swings out past a projecting frame or wall condition. Is the A571HD right?
For an offset condition, look at the Design Hardware FSOHD Full Surface Offset Heavy Duty Continuous Geared Hinge. It is a full surface heavy duty geared hinge like the ABH A571HD, but built with an offset geometry for openings where the door has to clear a projection at the frame. The A571HD is a straight full surface model. Both are heavy duty full surface, so the offset is the only thing separating them - the A571HD is correct on a flush frame condition, the FSOHD on the offset one.
18) The door is 1-3/8 inch thick. Can I use the ABH A571HD continuous hinge on it?
For a 1-3/8 inch door, the Pemko Short Leaf Flush Continuous Geared Hinge is built specifically for that thickness and is Grade 1 construction. The ABH A571HD is a heavy duty full surface geared hinge sized for commercial doors up to 48 inches wide and 450 lb, which is a heavier door than a 1-3/8 inch leaf typically is. On thin-leaf doors the short leaf flush geometry is what keeps the hinge in proportion to the door edge. Verify the door thickness at the opening before you commit either way.
19) Which continuous hinges besides the ABH A571HD carry a Grade 1 rating for a spec that calls for Grade 1?
The ABH A571HD is BHMA 156.25 Grade 1 certified. Among the geared hinge peers, four Pemko models also list Grade 1: the FM-RG Series aluminum full mortise raised geared hinge with 180-degree swing, the 84-inch full mortise short leaf flush heavy duty hinge, the short leaf flush hinge for 1-3/8 inch doors, and the DSH1000 anti-barricade hinge. All four are Grade 1 but differ in prep and function from the A571HD, which is full surface. If the submittal says Grade 1 continuous hinge and nothing else, any of these satisfies the grade line - then choose on prep, door thickness, and swing.
20) We need hospital tips on the continuous hinge to prevent snagging. Does the ABH A571HD offer that?
The A571HD has an AHT Advanced Hospital Tip option. Among the peers, the BEST 641 steel full mortise standard duty hinge and the BEST 651 stainless steel full mortise hinge both come with hospital tips as part of the model, though both are medium duty and full mortise rather than heavy duty full surface. On a patient room or corridor door where the tip profile is required for safety and the opening is surface applied, the A571HD with the AHT option keeps you in a heavy duty full surface hinge instead of changing prep.
21) The opening is a 120 inch tall door. Which continuous hinges cover that height?
The ABH A571HD comes in standard lengths of 79, 83, 85, 95 and 120 inches, so the 120 inch is a standard length rather than a cut. Several of the geared hinge peers are catalogued at a single length - the NGP HD1100A, HD5400A and HD5700 are each 83 inch models, and the Pemko CFM84SLF-HD1 is 84 inch. On a tall storefront-height or oversized opening, the 120 inch A571HD covers the leaf in one hinge, which is what keeps the load distributed along the full door edge rather than at butt points.
22) The job requires Buy American compliance. Does the ABH A571HD meet that where other continuous hinges may not?
The ABH A571HD is BAA qualified, which is the line a federal, municipal, or federally funded institutional job needs on the submittal. It is also BHMA 156.25 Grade 1 and rated to 450 lb, so the compliance does not come at the cost of duty level. Where a project specification carries a Buy American Act requirement alongside a Grade 1 continuous hinge call, the A571HD answers both in one part number and needs no mortising of door or frame to install.
23) Can I cross reference an existing aluminum continuous geared hinge to the ABH A571HD?
Yes. ABH publishes an Aluminum Continuous Geared Hinge Cross Reference Chart that maps competing aluminum geared hinge models to the ABH equivalent, and a Door Clearance Chart for confirming the opening will operate once the hinge is on. For a full surface heavy duty aluminum geared hinge the A571HD is the ABH position, rated to 450 lb with BHMA 156.25 Grade 1 certification. Peers in the same aluminum full surface heavy duty class include the Design Hardware FSHD and the NGP HD5700. Run the existing part through the cross reference before ordering, since prep and inset are what usually break a substitution, not the gear.
24) What finishes does the ABH A571HD come in?
Three: clear anodized aluminum, dark bronze anodized, and black anodized. All are anodized after machining, so the cut ends and gear teeth carry the finish rather than showing bare aluminum where the hinge was worked. Clear anodized is the usual match for aluminum storefront and mill finish frames; dark bronze and black are specified where the existing door hardware on the floor is already dark.
25) Does a continuous hinge actually improve security on an out-swing door?
It closes the gap. A continuous hinge runs the full height of the opening with no open knuckle gaps between door and frame, so there is nowhere to get a pry bar seated along the hinge edge, and no individual hinge pin to attack. On the A571HD that runs the whole 79 to 120 inch length of the hinge you order. That is a common reason it gets specified on exterior and tenant-separation doors that keep getting worked on.
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Does the ABH A571 HD079 C come with a warranty?
Absolutely. The ABH A571 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 A571 HD079 C?
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