Pemko HM-HD1 Heavy Duty Half M...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$378.00
$186.41
Pemko HM-HD1 Series Heavy Duty Half Mortise Continuous Geared Hinge

Pemko HM-HD1 Heavy Duty Half Mortise Continuous Geared Hinge with 5/32" Clearance and Grade 1 Rating

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Model: CHM83HD1
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$378.00
$186.41
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Pemko HM-HD1 Heavy Duty Half Mortise Continuous Geared Hinge with 5/32"; Clearance and Grade 1 Rating

Professional Heavy Duty Continuous Hinge Solution

The Pemko HM-HD1 Series Heavy Duty Half Mortise Continuous Geared Hinge is engineered for demanding commercial applications requiring only 5/32"; clearance. This Grade 1 aluminum construction hinge accommodates doors up to 1-3/4"; thick and 4' wide with maximum lengths up to 10' and minimum lengths of 79";. UL 10C certified for fire door assemblies and ANSI/BHMA A156.26 compliant, this hinge provides 180-Degree swing capability with guaranteed lifetime performance against defects in material and workmanship.

Professional Features & Benefits

  • Minimal Clearance Requirement: Requires only 5/32"; clearance for installation flexibility and proper door alignment adjustments in tight spaces.
  • Versatile Door Compatibility: Accommodates doors from 1-3/4"; thickness up to 4' width with custom lengths available from 79"; minimum to 10' maximum for diverse applications.
  • Heavy Duty Construction: Grade 1 aluminum construction with 1.15 lbs. per foot weight rating for exceptional durability in high-traffic commercial environments.
  • Fire Door Certified: UL 10C certified and ANSI/BHMA A156.26 compliant for use on swinging fire door assemblies including 3-Hour A-Label applications.
  • Complete Swing Range: Provides full 180-Degree swing capability with non-handed design for universal application and maximum door opening clearance.
  • Professional Fastening System: Includes #12-24 x 7/16"; Phillips Head Type C threadforming fasteners for frame and FHUC Type C fasteners for door portion.
  • Retrofit-Friendly Design: Half mortise mounting applied to exposed frame surface and door edge, ideal for new construction or retrofit applications.
  • Lifetime Warranty: Guaranteed for the life of the opening against defects in material and workmanship for long-term reliability and peace of mind.

Technical Specifications

  • Department: Door Hardware
  • Grade: Grade 1
  • Product Category: Door Hinges and Pivots
  • Product Group: Door Hinges and Pivots
  • Product Model: HM-HD1
  • Product Subgroup: Continuous Hinges
  • Product Substrate: Aluminum
  • Product Type: Continuous Hinges
  • Series: HM-HD1 Series
  • Subcategory: Continuous Hinges

Professional Applications

  • Commercial Fire Door Assemblies
  • Educational Facility Heavy Traffic Doors
  • Healthcare Institution Patient Room Doors
  • Industrial Facility Access Doors
  • Retrofit Applications on Existing Openings
  • Multi-Tenant Residential Fire-Rated Doors
  • Government and Municipal Building Entrances

Why Choose Pemko Quality?

Pemko HM-HD1 Series continuous hinges deliver professional-grade reliability with Grade 1 aluminum construction and UL 10C fire door certification. Guaranteed for the life of the opening against defects in material and workmanship with ANSI/BHMA A156.26 compliance. Engineered for demanding commercial applications where dependable performance and fire safety compliance are essential.

Product Specs

Subcategory:
Continuous Hinges
Grade:
Grade 1
Product Group:
Door Hinges and Pivots
Product Subgroup:
Continuous Hinges
Product Type:
Continuous Hinges
Product Model:
HM-HD1
Product Category:
Door Hinges and Pivots
Department:
Door Hardware
Product Substrate:
Aluminum
Series:
HM-HD1 Series

Pemko CHM83HD1 – Frequently Asked Questions

1) Can I use a Pemko HM-HD1 hinge on a 3 hour fire rated door?
Yes. The HM-HD1 is UL 10C certified for swinging fire door assemblies, including 3 hour A-Label openings, and it meets ANSI/BHMA A156.26. That is the spec line a fire door inspector or an institutional spec writer looks for, and it is why this hinge shows up on stairwell and corridor openings in schools, hospitals and multi-tenant residential.
2) What is the difference between a half mortise and a full mortise continuous hinge?
Half mortise means one leaf mortises into the door edge while the other applies to the exposed face of the frame. That is what the HM-HD1 does, and it is the reason it retrofits well: you machine the door, not the frame. A full mortise hinge, like the ABH A120HD or the Design Hardware FMHD, mortises into both the door and the frame, so it hides completely but wants both members prepped. Full surface types such as the ABH A460HD or NGP HD5700 apply to both faces with no mortising at all, which is the easiest install on a beat up existing frame but leaves the hinge visible.
3) Do I have to order a left hand and right hand continuous hinge separately?
No. The HM-HD1 is non-handed, so one part number covers both swings. Order by length and finish only. That matters if you are buying for a building with mixed door swings, since you can stock a single length rather than pairs.
4) Can I replace sagging butt hinges on an existing door with a Pemko HM-HD1?
That is the case this hinge is built for. Half mortise mounting applies to the exposed frame surface and mortises into the door edge, so you are prepping the door and screwing to the frame face rather than cutting new frame pockets. You need 5/32 inch clearance at the hinge edge and a door no thicker than 1-3/4 inches and no wider than 4 feet. Where the existing frame is too damaged to take fasteners cleanly on the face, a full surface hinge like the Design Hardware FSHD applies to both faces instead.
5) My door is 2-1/4 inches thick. Will the Pemko HM-HD1 work?
No. The HM-HD1 is set up for 1-3/4 inch doors, so a 2-1/4 inch leaf is outside it. For thicker doors, the NGP HD5700 is a full surface continuous geared hinge with a 1/16 inch door inset covering 1-3/4 to 2-1/4 inch doors, and it is 10C fire rated for 90 minutes on hollow metal.
6) What is the closest half-mounted continuous geared hinge to the Pemko HM-HD1 if I need a half surface instead of half mortise?
The Pemko HM-HD1 is a half mortise continuous geared hinge, applied to the exposed frame surface and the door edge. When the door face is the surface you have to work from instead of the door edge, the ABH A460HD is a heavy duty aluminum continuous gear hinge in a half surface configuration, and the NGP HD5400A is a half surface continuous geared hinge in aluminum alloy. Both keep the geared aluminum continuous format; the difference is which face of the door leaf the door-side leaf lands on, which changes the prep you cut.
7) I need a continuous geared hinge that is fully concealed when the door is closed - what takes the place of a Pemko HM-HD1?
The HM-HD1 is a half mortise hinge, so one leaf sits on the exposed frame face and is visible with the door closed. For a concealed appearance, the NGP HD1100A is a concealed continuous geared hinge supplied at 83 inches, which matches the 83 inch length the HM-HD1 offers. Concealed mounting is a full mortise style prep into the door edge and frame rabbet rather than a surface-applied leaf, so plan the prep accordingly.
8) The Pemko HM-HD1 needs 5/32 inch clearance - what continuous hinge should I use if my door inset is different?
The HM-HD1 is built around a 5/32 inch clearance. If the existing opening runs a tighter inset, the BEST 663HD is a heavy duty continuous hinge built for 3/32 inch inset doors, and the NGP HD5700 is a full surface continuous geared hinge with a 1/16 inch door inset that covers 1-3/4 inch to 2-1/4 inch doors. Measure the gap between door edge and frame before ordering, because the geared barrel is sized to a specific inset and will not take up a different one.
9) My Pemko HM-HD1 is on a 1-3/4 inch door - what continuous hinge covers a thicker door leaf?
The HM-HD1 accommodates doors 1-3/4 inches thick. For a thicker leaf, the NGP HD5700 is a full surface continuous geared hinge rated for 1-3/4 inch through 2-1/4 inch doors, so it carries the same 1-3/4 inch case and extends up to 2-1/4 inches. It is a full surface hinge, meaning both leaves apply to the exposed faces of frame and door rather than into the door edge.
10) Is a BEST 641 or 651 continuous hinge an equivalent swap for a Pemko HM-HD1?
They are not the same duty class. The Pemko HM-HD1 is a heavy duty hinge with a Grade 1 rating in aluminum. The BEST 641 is a steel full mortise standard duty continuous hinge and the BEST 651 is a stainless steel full mortise continuous hinge, both classed medium duty. They are also full mortise rather than half mortise, so the door-side prep differs. For a heavy duty full mortise geared hinge instead, the ABH A120HD and the Design Hardware FMHD are both heavy duty full mortise continuous geared hinges.
11) The spec on my drawing calls for a Grade 1 continuous geared hinge - does the NGP HD1100A meet that the way the Pemko HM-HD1 does?
The Pemko HM-HD1 is a Grade 1 hinge. The NGP HD1100A is listed at Grade 3, so if the drawing calls Grade 1 by number, the HD1100A is a different grade line even though it is a heavy-duty concealed geared hinge. Read the grade off the submittal rather than off the heavy duty label, because the two are set independently.
12) Does the Pemko HM-HD1 hinge come with screws, or do I need to buy fasteners?
Fasteners are included, and they are specific to each leaf. The frame side uses #12-24 x 7/16 inch Phillips head Type C threadforming screws; the door portion uses FHUC Type C fasteners. Nothing else needs to be ordered to mount it, though on a fire rated opening you must use the supplied fasteners rather than substituting.
13) Will a continuous geared hinge let the door swing a full 180 degrees against the wall?
The HM-HD1 gives a full 180 degree swing. On a half mortise mounting the hinge sits at the frame face, so the door clears back to the wall, which is what you want on healthcare patient room doors and equipment access openings where a gurney or a cart has to come through. If you need the leaf to swing entirely clear of the opening width, that is a different type: a swing clear hinge such as the ABH A210HD.
14) Is there a continuous hinge that hides completely when the door is closed?
The HM-HD1 is not concealed. Its half mortise mounting leaves the frame leaf visible on the frame face. For a hinge that disappears into the opening, the NGP HD1100A is a concealed continuous geared hinge in an 83 inch length, 10C fire rated for 90 minutes on hollow metal. Note the trade off: that one is Grade 3, where the Pemko is Grade 1.
15) What continuous hinge should I specify instead of the Pemko HM-HD1 on a school or detention door where pinch points are a concern?
The HM-HD1 is a heavy duty half mortise geared hinge for high-traffic commercial openings. Where the specification calls out a safety-oriented hinge profile, the ABH A135HD is a heavy duty aluminum continuous gear hinge with a safety design. Both are heavy duty aluminum geared continuous hinges; the A135HD is the one written around the safety profile.
16) The frame face on my opening is out of plane - is there a continuous geared hinge alternative to the Pemko HM-HD1 with an offset?
The HM-HD1 is a half mortise hinge that applies to the exposed frame surface and the door edge, so it assumes a usable frame face and a prepped door edge. Where the geometry needs the door leaf carried away from the frame, the Design Hardware FSOHD is a full surface offset heavy duty continuous geared hinge, and the non-offset Design Hardware FSHD is the full surface heavy duty version of the same family.
17) I am standardizing continuous hinges across a building and some doors are steel-clad interiors - do I need the aluminum Pemko HM-HD1 everywhere?
The HM-HD1 is aluminum construction with a Grade 1 rating and comes in clear anodized aluminum and dark bronze anodized aluminum finishes. If part of the fleet wants a different base material, the BEST 641 is a steel full mortise continuous hinge and the BEST 651 is stainless steel full mortise, both with hospital tips. Mixing materials across a building is normal, but keep the mounting configuration consistent per opening type so the door and frame preps repeat.
18) What finishes does the Pemko HM-HD1 continuous hinge come in?
Two anodized aluminum finishes, clear and dark bronze, and both are offered across every length: 83, 85, 95 and 120 inches. Clear anodized reads as a satin silver next to aluminum storefront; dark bronze matches bronze anodized frames and dark painted hollow metal. There is no painted or plated option in the series, so match to the frame rather than to the lockset.
How fast can I get the Pemko CHM83HD1 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 Pemko CHM83HD1 come with a warranty?
Absolutely. The Pemko CHM83HD1 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 Pemko CHM83HD1?
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 Pemko CHM83HD1 from ZenSupply?
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