Commercial door hinges are installed by positioning a handing shim inside the door edge, aligning the hinge over the shim, and driving machine screws through the hinge leaves into the pre-punched hinge reinforcements. This guide covers the complete procedure for installing standard five-knuckle, non-removable pin hinges on an 18-gauge hollow metal commercial door, including door handing, screw selection, and orientation requirements.
CDF Distributors ships complete door and frame assemblies with hinges included from its Nashville, Tennessee headquarters. You can configure and order online using CDF’s ProBuilder tool at cdfdistributors.com. For assistance selecting the correct hinge configuration for your project, call (855) 769-9895 or email sales@cdfdoors.com.
What Is a Commercial Door Hinge?
A commercial door hinge is a five-knuckle, non-removable pin hinge designed for use on hollow metal and wood commercial doors. The standard commercial hinge size is 4-1/2” x 4-1/2”. Unlike residential hinges, which typically use a three-knuckle design with a removable pin, commercial hinges use five interlocking knuckles with a pin that cannot be removed when the door is closed. This prevents unauthorized hinge pin removal from the exterior of a secured opening.
Commercial hinges are sold three per box. Each box includes a pack of hinge screws containing both wood screws and machine screws. Wood screws are used when installing hinges on a wood door. Machine screws are used when installing hinges on a hollow metal door. The screw type must match the door material. For the 18-gauge hollow metal door covered in this guide, machine screws are required.
Installation Specifications
This guide covers the installation of three standard commercial hinges on an 18-gauge non-handed hollow metal door. The door features a polystyrene foam core and factory-installed hinge reinforcement shims at each hinge location. The hinge size is 4-1/2” x 4-1/2”, five-knuckle, non-removable pin. Handing is determined during installation by positioning the handing shims and orienting the light kit.
At a Glance
Door Type | 18-gauge hollow metal, polystyrene foam core |
Hinge Size | 4-1/2” x 4-1/2” |
Hinge Style | Five-knuckle, non-removable pin |
Hinges Per Door | Three (shipped three per box) |
Screw Type (Metal Door) | Machine screws |
Screw Type (Wood Door) | Wood screws |
Required Bit | #3 Phillips |
Door Handing | Non-handed as shipped; handing determined during installation |
Understanding Door Handing
18-gauge hollow metal commercial doors are manufactured as non-handed units. The door is not designated as left-hand or right-hand swing until the installer positions the handing shims and hinges. Two factors determine the hand of the door during installation.
- Handing shims. Each door contains factory-installed hinge reinforcement shims on both edges. The installer selects which edge becomes the hinge side by installing the hinges on the corresponding shims. The handing shim holes align with the hinge screw holes.
- Light kit orientation. If the door includes a vision light (window), the light kit is held in place by screws on one side. The screw side of the light kit must face the interior (secure side) of the building. This prevents someone from removing the light kit screws from the exterior to gain unauthorized access. The opposite side of the light kit is flush and smooth.
Both factors must be considered together. The hinge placement and light kit screw orientation must result in a consistent door hand that matches the frame and hardware schedule.
Tools and Materials
- Impact drill or screw gun: for driving hinge screws
- #3 Phillips bit: required for hinge machine screws; prevents stripping
- Machine screws: included with hinge set; for 18-gauge hollow metal doors
- Wood screws: included with hinge set; for wood doors (not used in this procedure)
- Handing shims: factory-installed inside the door at each hinge location
- Hinges (three per door): standard commercial grade, 4-1/2” x 4-1/2”, five-knuckle, non-removable pin
Step-by-Step Installation
Step 1: Determine the Door Hand
Before installing any hardware, determine the required door hand based on the frame configuration and the building’s security requirements.
- Identify which edge of the door will be the hinge side. The hinge side must correspond to the hinge jamb of the frame.
- If the door has a light kit, confirm that the screw-retention side of the light kit will face the interior (secure side) of the building when the door is hung.
- Locate the hinge reinforcement shims on the selected hinge edge. The shim holes will align with the hinge screw pattern.
Step 2: Position the Handing Shim
Each hinge location on the door has a factory-installed hinge reinforcement area. The handing shim is positioned to create the correct alignment for the hinge.
- Align the handing shim so that the holes on the shim line up with the holes on the door edge at the hinge location.
- Press the handing shim into position. The shim has small bulbs (raised tabs) that snap into the door edge and hold the shim in place before the hinge is installed.
- Verify that the shim is seated firmly and does not shift when touched. The bulbs provide temporary retention only; the hinge screws provide the permanent fastening.
Labeled diagram showing: handing shim alignment with door edge holes, bulb retention tabs, and hinge screw hole pattern. This diagram requires CDF approval before inclusion in the production file.
Step 3: Orient the Hinge Correctly
Before fastening the hinge, verify that it is oriented correctly. Two indicators confirm proper orientation.
- Drain hole position. Each hinge has a small hole at the bottom of the knuckle barrel. This hole must face the floor. On an exterior door, this allows any moisture that enters the knuckle to drain out rather than collecting inside and causing the hinge to rust. If the drain hole faces upward, moisture is trapped and the hinge will corrode and fail prematurely.
- Logo orientation. CDF hinges have the CDF logo stamped on the knuckle. When the door is standing upright and the hinge is correctly oriented, the logo reads right-side up. If the logo appears upside down, the hinge is installed upside down and must be corrected.
Labeled diagram showing: drain hole at bottom of knuckle barrel, CDF logo orientation (right-side up when correct), and hinge leaf alignment with door edge. This diagram requires CDF approval before inclusion in the production file.
Step 4: Align the Hinge on the Door Edge
With the handing shim in place and the hinge oriented correctly, position the hinge leaf on the door edge.
- Place the hinge leaf flat against the door edge so that the screw holes in the hinge align with the holes in the handing shim and the door.
- Confirm that the knuckle barrel extends beyond the door face on the correct side (the side that will be the pull side when the door is hung).
- Hold the hinge in position and insert the first machine screw by hand to prevent the hinge from shifting during power driving.
Step 5: Drive the Hinge Screws
Use the impact drill with a #3 Phillips bit to drive the machine screws through the hinge leaf, through the handing shim, and into the threaded hinge reinforcement inside the door.
- Drive each screw until it is firmly seated. Apply consistent torque across all screws in the hinge leaf.
- Do not over-torque. The screw head should sit flush with the hinge leaf surface. Over-torquing can strip the threads in the door reinforcement.
- After all screws are driven, verify that the hinge leaf is tight against the door edge with no gap between the leaf and the door surface.
A #3 Phillips bit is required for hinge machine screws. Using a #2 bit or a worn #3 bit will result in a loose fit between the bit and the screw head. A loose bit will strip the screw head, making the screw difficult or impossible to remove if the hinge ever needs replacement.
Step 6: Repeat for All Three Hinge Locations
Commercial doors require three hinges. Repeat Steps 2 through 5 for each hinge location on the door edge.
- At each location, verify the handing shim alignment, hinge orientation (drain hole down, logo right-side up), and screw torque before moving to the next hinge.
- Once all three hinges are installed, the hinge leaves will fold flat against the door face for transport and door hanging.
Step 7: Verify the Completed Installation
Before proceeding to hang the door, verify the following at all three hinge locations.
- All hinge screws are fully seated and tight
- No gap exists between any hinge leaf and the door edge
- All drain holes face the floor (bottom of the knuckle barrel)
- All CDF logos read right-side up
- Hinge leaves fold freely without binding
The next step in the assembly process is hanging the door on the frame, which involves aligning the door-side hinge leaves with the frame-side hinge leaves and driving the corresponding frame-side screws.
Common Mistakes to Avoid
Avoid these errors when installing commercial door hinges:
- Installing the hinge upside down. If the drain hole faces upward, moisture collects inside the knuckle barrel and causes corrosion. Check the drain hole position and CDF logo orientation before driving screws.
- Using the wrong screw type. Machine screws are required for hollow metal doors. Wood screws are required for wood doors. Both types are included in the hinge box. Using wood screws on a metal door will not provide adequate thread engagement.
- Using the wrong bit size. Hinge machine screws require a #3 Phillips bit. A #2 bit is too small and will strip the screw heads, making future hinge replacement difficult or requiring screw extraction.
- Skipping the handing shim. The handing shim must be positioned before the hinge is installed. The shim provides the alignment between the hinge screw holes and the door’s internal reinforcement. Without it, screws may not engage the reinforcement properly.
- Ignoring light kit orientation. On doors with vision lights, the screw-retention side of the light kit must face the secure (interior) side of the building. If the hinge side and light kit orientation conflict, the door hand must be reconsidered before installation.
- Over-torquing screws. Driving screws too aggressively can strip the threaded reinforcement inside the door. Screw heads should sit flush with the hinge leaf surface without excessive force.
A Note on Fire-Rated Assemblies
If the door assembly requires a fire rating, the hinges must be listed for use in fire-rated openings. Fire-rated commercial door assemblies are available at five rating levels: 20, 45, 60, 90, and 180 minutes. All components in the assembly—door, frame, hinges, and all other hardware—must carry matching fire labels. CDF rivets fire labels onto every fire-rated assembly before shipping.
Verify all code requirements with project specifications and the Authority Having Jurisdiction (AHJ).
Configure Your Assembly
CDF’s ProBuilder tool allows contractors and facility managers to configure complete door and frame assemblies online, including hinge selection. During configuration in ProBuilder, hinge type, size, and finish are selected as part of the hardware schedule. ProBuilder displays compatible options and provides instant pricing.
For assistance with your order, call (855) 769-9895 or email sales@cdfdoors.com. CDF’s sales team is available Monday through Friday, 7:30 AM to 4:30 PM CT.
Frequently Asked Questions
What size hinges are used on commercial hollow metal doors?
The standard commercial hinge size is 4-1/2” x 4-1/2”. This is a five-knuckle, non-removable pin hinge. Three hinges are required per door. CDF ships hinges three per box with both wood screws and machine screws included.
What is the difference between wood screws and machine screws for hinges?
Wood screws have a tapered, self-threading shank designed for wood doors. Machine screws have a straight shank with uniform threads designed for the threaded reinforcements inside hollow metal doors. Both types are included in every CDF hinge box. The screw type must match the door material.
Why does the hinge drain hole need to face the floor?
The small hole at the bottom of the hinge knuckle barrel is a drain hole. If the hinge is installed correctly with the drain hole facing down, any moisture that enters the knuckle drains out. If the drain hole faces upward, moisture is trapped inside the barrel and causes the hinge pin and knuckles to corrode, reducing the operational life of the hinge.
How do you determine the hand of a non-handed commercial door?
Non-handed 18-gauge hollow metal doors have hinge reinforcement shims on both edges. The door hand is determined by which edge the installer places the hinges on and by the orientation of the light kit (if present). The light kit screws must face the interior of the building for security.
What drill bit is required for commercial hinge screws?
A #3 Phillips bit is required for commercial hinge machine screws. Using a smaller bit (such as a #2) will result in a loose fit that strips the screw heads. A stripped screw head makes future hinge replacement difficult. Always confirm that the bit sits firmly in the screw head before driving.
Can commercial door hinges be used in fire-rated assemblies?
Yes. Commercial hinges can be used in fire-rated assemblies at all five standard rating levels: 20, 45, 60, 90, and 180 minutes. The hinges must be listed for fire-rated use, and all components in the assembly must carry matching fire labels. Verify requirements with project specifications and the AHJ.
What holds the handing shim in place before the hinge is installed?
The handing shim has small raised tabs called bulbs that snap into the door edge and provide temporary retention. The bulbs hold the shim in position while the hinge is aligned and screws are driven. The hinge screws provide the permanent fastening.
About This Guide
This installation procedure reflects CDF Distributors’ standard fabrication specifications and field-tested installation method used by commercial door installers nationwide. The full installation video is available on CDF’s YouTube channel at youtube.com/@CDF_Distributors.
For questions about hinge installation or to order a complete door assembly, contact CDF at (855) 769-9895 or sales@cdfdoors.com. Configure your assembly online at cdfdistributors.com using ProBuilder.
