Pemko HM Series Half Mortise C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$316.30
$283.20
Pemko HM Series Standard Duty Half Mortise Continuous Geared Hinge

Pemko HM Series Half Mortise Continuous Geared Hinge - Grade 1 Aluminum with 5/32" Clearance

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Model: CHM83
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$316.30
$283.20
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Pemko HM Series Half Mortise Continuous Geared Hinge - Grade 1 Aluminum with 5/32"; Clearance

Professional Half Mortise Continuous Hinge Solution

The Pemko HM Series Half Mortise Continuous Geared Hinge is engineered for retrofit applications and new construction on swinging fire doors. This Grade 1 aluminum hinge requires only 5/32"; clearance and accommodates door thicknesses of 1-3/4"; with maximum door widths up to 4 feet. Available in lengths from 79"; minimum to 10 feet maximum, this hinge provides 180-Degree swing capability with UL 10C fire door certification.

Professional Features & Benefits

  • Minimal Clearance Requirement: Requires only 5/32"; clearance for tight-fitting applications and allows adjustments for proper door alignment.
  • Door Compatibility: Accommodates 1-3/4"; door thickness with maximum door widths up to 4 feet for versatile installation options.
  • Grade 1 Construction: Heavy-duty aluminum construction meets ANSI/BHMA Standard A156.26 for commercial-grade durability and performance.
  • Custom Length Options: Available in lengths from 79"; minimum to 10 feet maximum with custom lengths available for specific applications.
  • Fire Door Certification: UL 10C certified for use on fire-rated assemblies with special FirePins required only on 3-Hour A-Label assemblies.
  • Self-Drilling Installation: Frame fasteners are #12-24 x 7/16"; Phillips Head Type C threadforming, door fasteners are #12-24 x 7/16"; FHUC Type C threadforming.
  • Retrofit Friendly Design: Applied to exposed surface of frame and door edge, designed for retrofit work without requiring hinge reinforcement removal.
  • Manufacturer Warranty: Guaranteed for the life of the opening against defects in material or workmanship for long-term reliability.

Technical Specifications

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

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 Pemko Quality?

Pemko HM Series continuous hinges deliver professional-grade reliability with Grade 1 aluminum construction meeting ANSI/BHMA Standard A156.26 and UL 10C fire door certification. Guaranteed for the life of the opening against defects in material or workmanship with 1.15 pounds per foot weight rating. 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
Product Category:
Door Hinges and Pivots
Department:
Door Hardware
Product Substrate:
Aluminum
Series:
HM Series

Pemko CHM83 – Frequently Asked Questions

1) Will the Pemko HM Series continuous hinge work on a 1-3/4 inch door?
Yes, 1-3/4 inches is the door thickness the HM Series half mortise geared hinge is built for, with a maximum door width of 4 feet. It needs 5/32 inch clearance at the hinge edge, so check that gap before you order. Doors wider than 4 feet or thinner or thicker than 1-3/4 inches call for a different hinge.
2) What does half mortise mean on this Pemko hinge, and how is it different from full mortise or full surface?
Half mortise means one leaf mortises into the door edge while the other applies to the exposed surface of the frame. That is why the HM Series suits retrofit work: you do not have to pull existing hinge reinforcement out of the frame. If your frame and door faces are both open and you want everything surface applied, a full surface gear hinge like the Design Hardware FSHD is the other approach; for a fully concealed look with both leaves mortised, the Design Hardware FMHD full mortise is the type to look at.
3) Is the Pemko HM Series hinge fire rated?
The HM Series carries UL 10C certification for swinging fire doors. On 3-Hour A-Label assemblies you also need the special FirePins; below that they are not required.
4) What lengths does the Pemko HM half mortise hinge come in?
Stock lengths are 83, 85, 95 and 120 inches, each available in clear anodized or dark bronze anodized aluminum. The series runs from a 79 inch minimum to a 10 foot maximum, and custom cut lengths are made for openings that fall outside the stock sizes. A 120 inch piece covers a 10 foot door in one run rather than stacking hinges.
5) I need a continuous geared hinge on a door thicker than 1-3/4 inches, what else is there?
The Pemko HM half mortise is a single thickness hinge for 1-3/4 inch doors, so it is the wrong part for a thicker leaf. The NGP HD5700 full surface geared hinge covers 1-3/4 to 2-1/4 inch doors with a 1/16 inch door inset and is also 10C fire rated for 90 minutes on hollow metal.
6) Can I use the Pemko HM hinge on a retrofit without replacing the frame?
That is what the half mortise design is for. The frame leaf applies to the exposed face of the frame, so existing hinge reinforcement stays in place, and the 5/32 inch clearance requirement means it fits tight existing gaps while still allowing adjustment to bring the door back into alignment.
7) What is the closest alternative to the Pemko HM Series half mortise geared hinge if the frame has no mortise prep at all?
The Pemko HM is a half mortise hinge, meaning it is applied to the exposed surface of the frame and the door edge. If you want a hinge that mounts entirely to the exposed faces of both the door and the frame instead, the ABH A460HD is a half surface aluminum continuous gear hinge, and the Design Hardware FSHD is a full surface heavy duty continuous geared hinge. NGP also offers the HD5700 full surface geared hinge in an 83 inch length with a 1/16 inch door inset for 1-3/4 to 2-1/4 inch doors.
8) Which continuous hinges besides the Pemko HM carry a UL 10C fire rating?
The Pemko HM Series is UL 10C certified for fire rated assemblies, with special FirePins required only on 3-hour A-label openings. Among the alternatives, the NGP HD1100A concealed, HD5400A half surface, and HD5700 full surface geared hinges are each listed as 10C fire rated 90 minute on hollow metal. BEST 663HD and 664HD are 90 minute UL fire rated as well.
9) Is a half surface continuous hinge the same thing as the Pemko HM half mortise?
No. The Pemko HM Series is half mortise: it applies to the exposed surface of the frame and to the door edge, and needs only 5/32 inch clearance. A half surface hinge such as the ABH A460HD or the NGP HD5400A applies to the door face instead of the door edge. They are not interchangeable preps, so check which face the existing hardware and any hinge reinforcement occupy before ordering.
10) Do I need to order screws separately for the Pemko HM hinge?
No. Fasteners come with it: frame side is #12-24 x 7/16 inch Phillips head Type C threadforming, door side is #12-24 x 7/16 inch FHUC Type C threadforming. They are self-drilling threadformers, so no tapping ahead of time.
11) Is this Pemko hinge strong enough for a high-traffic commercial door?
It is a Grade 1 aluminum geared continuous hinge meeting ANSI/BHMA A156.26, which is the top durability tier under that standard, and the geared leaf spreads door load along the full height instead of concentrating it on three butts. Pemko lists it for office buildings, schools, healthcare, retail, industrial, multi-tenant residential and government work.
12) Is there a stainless steel or steel continuous hinge instead of the aluminum Pemko HM?
The Pemko HM Series is built from aluminum in clear anodized and dark bronze anodized finishes. If the substrate matters for your environment, the BEST 641 is a steel full mortise continuous hinge and the BEST 651 is stainless steel full mortise, both with hospital tips. Note that both of those are full mortise, so they set into the door and frame edges rather than applying to the exposed frame face the way the half mortise HM does.
13) Our spec calls for ANSI/BHMA A156.26 Grade 1. Which of the continuous hinge options meet that?
The Pemko HM Series is a Grade 1 aluminum hinge meeting ANSI/BHMA A156.26. The NGP HD1100A concealed geared hinge is listed at Grade 3, so it is a different classification if your drawing calls out Grade 1 specifically. Confirm the grade line on any alternate against the submittal before substituting.
14) The Pemko HM starts at 79 inches. What continuous hinge comes in a fixed 83 inch length?
The Pemko HM Series runs from a 79 inch minimum to 10 feet maximum, with stocked sizes including 83, 85, 95 and 120 inches. If you want a hinge cataloged at a single standard door height, the NGP HD1100A concealed, HD5400A half surface, and HD5700 full surface geared hinges are each listed at 83 inches.
15) How far will a door on the Pemko HM Series hinge swing open?
180 degrees. Full swing lets the door clear the opening for gurneys, carts or moving equipment, which is part of why it is specified in healthcare and warehouse openings.
16) Which finish should I order to match other aluminum hardware in the building?
Two anodized aluminum finishes are made: clear anodized and dark bronze anodized, and both run across all four stock lengths (83, 85, 95 and 120 inches). Clear anodized generally lines up with mill-finish aluminum storefront and frames, dark bronze with bronze anodized frames and closers.
17) Is there a continuous hinge option with a finger safety feature or an offset pivot geometry?
The Pemko HM Series is a standard duty half mortise geared hinge with 180 degree swing. If the opening calls for a different geometry, the ABH A135HD is a heavy duty aluminum continuous gear hinge with a safety design, and the Design Hardware FSOHD is a full surface offset heavy duty continuous geared hinge. The ABH A120HD full mortise hinge is offered with easy install technology.
How fast can I get the Pemko CHM83 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 CHM83 come with a warranty?
Absolutely. The Pemko CHM83 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 CHM83?
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 CHM83 from ZenSupply?
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