Garage Door Hinge Numbering: What #1, #2, #3 and #4 Mean

What hinge numbering is

DASMA defines a graduated edge hinge as a hinge placed on the edge of door sections that lets the sections pivot as the door opens and closes, holds the track roller, and is graduated and numbered for correct placement so the door sits flush of the door against the jambs when closed ¹.

DASMA lists end roller hinge and numbered roller bracket as other names ¹.

Each end hinge has a roller tube on its outer edge. The higher the number, the taller the hinge, so the roller tube sits further from the face of the door. Clopay’s installation manual puts it simply: hinges are taller with increasing number ³.

How the numbers make the door seal

Vertical tracks are usually set so the door, when closed, presses lightly against the stop molding on the jambs.

If every roller sat the same distance from the door, the door would hang straight and leave a gap, or the tracks would have to lean.

Graduated hinges solve this: each section up, the roller is held a bit further out, so the door face tips toward the jambs and stop molding along its full height.

That geometry also matters as the door moves. As each section rounds the radius into the horizontal track, the stepped-out rollers let the sections rotate without the top edges rubbing the header or jambs. DASMA’s definition ties the numbering to a flush fit against the jambs ¹.

Clopay’s published hinge sequence

Example: reading the sequence

Clopay’s commercial sectional manual gives these rules alongside its hinge chart ³.

Note the two sequences in the table above disagree on the bottom section’s end hinge depending on track size. Always follow the hinge chart in your door’s own manual.

Where to find the number

The number is stamped into the hinge leaf, usually near the pivot. Look at the end hinges from inside the garage: you should see the numbers rise from the bottom up. Center hinges, away from the edges, normally all read 1 ³.

Rust and paint can hide the stamp. Comparing hinge height side by side tells you the order even when you cannot read it.

Measure from the door face to the center of the roller tube on each one; the measurement should grow by a similar step at every section, and the left and right sides of the door should match.

What happens with the wrong hinge

A hinge one number too low pulls its roller in, so that section hangs away from the stop molding and leaves a gap, or the roller binds against the back of the track.

One too high pushes the section into the jamb so it drags, and can make the roller ride the edge of the track. Either way the door may grind at the radius or the roller may pop out.

If you see a gap at one section or a hinge that looks out of step with its neighbors, have a technician check it. See track misalignment.

Replacing a hinge safely

Clopay’s parts guide lists hinges among parts homeowners can sometimes replace, while warning that bottom brackets must not be removed while the door is under tension ⁴. Clopay’s installation manual warns that springs, cables and bottom brackets are under extreme spring tension and not to loosen fasteners on those components ³.

A replacement hinge must carry the same number and fit the same roller. Replace one hinge at a time with the door closed, so the section stays supported.

DASMA advises occupants not to remove, adjust or repair door components ²; if a hinge is cracked or the door has dropped at a joint, leave it to a technician.

Low-headroom, high-lift and full-view doors

Clopay notes that non-standard tracks may require a different hinge pattern, and that full-view sections and doors use different center hinges ³. Low-headroom and high-lift doors change the track geometry, so their hinge chart can differ. Do not assume a standard sequence on these doors. See track lift type.

Double end hinges on heavy doors

Wide, heavy or commercial doors may use two end hinges side by side at each joint, called double end hinges, to spread the load on the end stiles.

Clopay’s manual shows both single and double end-hinged doors and says double end hinges use the same number as the outside end hinges ³.

So a joint that takes a #3 outside hinge takes a #3 inner hinge too.

On these doors, reinforcing struts often fasten to the hinges as well. Clopay’s instructions describe attaching each end of a strut to the end hinges, then to the center hinges ³. That makes the hinge pattern part of the door’s structure, and another reason to replace like with like.

Why the numbers rise from the bottom

The bottom section sits lowest in the vertical track and the top section highest, and the track is set so the door closes tight against the stop molding.

Each section higher needs its roller held a little further out to keep that line.

When the door opens, the top section leads into the radius first, and its taller hinges and top roller bracket give it the clearance to swing back under the header.

That is why Clopay starts the end hinge sequence at the top of the bottom section and continues upward ³, and why the top section uses a separate top roller bracket rather than a hinge. If you ever find a high number low on the door, it is almost certainly in the wrong place.

Buying replacement hinges

Hardware stores sell numbered hinges individually, usually #1 through #4 for common residential doors.

Before buying, read the number on the old hinge, check the steel thickness and the hole pattern, and note whether it has one roller tube or two.

A hinge from a different brand with the same number may still sit at a slightly different height, so compare it with the old one side by side.

Buy the screws the maker specifies. Clopay’s manual calls out particular self-drilling and sheet metal screws for each attachment point ³; random screws can strip the thin steel of a section and let the hinge pull out later.

Correct numbering: benefits

Limits

Hinge numbers are not universal across makers. The numbers on one brand’s hinges may not match another’s heights, and track size changes the sequence ³. Use the door maker’s chart or match the old hinge’s height exactly.

What drives cost

No prices on this page. See the cost guide.

• Hinge gauge and finish.
• Number needed, including center hinges.
• Labor if sections need support or realignment.

How to check your hinges

1. Close the door and disconnect the opener.
2. Read the numbers on the end hinges, bottom to top.
3. Check they rise one step per section on a standard door ³.
4. Check center hinges are all the same number.
5. Look for cracks, elongated holes or loose screws; report them to a technician ².

Upkeep

• Lubricate hinge pins every 3 to 6 months ⁵.
• Inspect hinges at least annually ⁴.
• Replace cracked hinges promptly.

Warning signs

A cracked hinge leaf, a hinge pulling out of a section, or a section that drops at one end are urgent. The section can fold or the roller can leave the track. Stop using the door and call a technician.

Standards

Hinge numbering is a maker convention described in DASMA’s terminology ¹, not a code requirement. Follow the door’s installation manual.

End hinges vs center hinges

Myths

Myth All hinges are interchangeable.

Reality End hinges are graduated ¹.

Myth #1 is always at the top.

Reality Numbers rise upward ³.

Myth Every maker uses the same sequence.

Reality Track size and maker change it ³.

Climate

Bottom line

Match numbers exactly when replacing a hinge, never touch the bottom brackets, and let a technician handle cracked hinges or sagging sections. See section joint.

Related terms

Section Joint

A section joint is the interface where the bottom meeting rail of one garage door section meets the top meeting rail of the next, shaped so the two edges nest together and form a weather-resistant seal when the door is closed.

Roller Wear

Roller wear is the gradual breakdown of a garage door’s track rollers, the wheel-and-stem assemblies that guide each section along the track, through worn bearings, flattened or cracked wheels and bent or worn stems.

Track Misalignment

Track misalignment is a fault in which a garage door’s vertical or horizontal tracks are bent, loose, out of plumb or not parallel, so the rollers bind, grind or leave the track instead of running freely.

Sectional Garage Door

A sectional garage door is a door made of two or more horizontal sections hinged together that ride on rollers in side tracks, bending through a curve to rest flat under the ceiling when open.

Weatherstripping

Weatherstripping is the set of flexible seals that close the gaps around a garage door, chiefly the perimeter seal along the jambs and header, plus seals at the top, between sections and at the bottom edge.

Also referenced from: Vertical Track, Section Joint, Roller Wear, Track Misalignment