Cracked Garage Door Hinges and Torn End Stiles

Why hinges are numbered

Sectional door hinges are stamped 1 through 4 (sometimes higher on tall doors). The number sets the roller offset so each section tracks correctly as the door bends around the curve.

• Number 1 hinges sit between the bottom sections.
• Higher numbers move up the door, increasing offset toward the top.
• An unnumbered hinge is a center hinge and carries no roller.
• Installing the wrong number causes binding and premature stile tearing.
• Always replace like for like, matching gauge as well as number.

Signs of hinge and stile failure

These show up as noise and movement long before anything breaks apart.

• A rhythmic clunk at the same point in travel.
• Visible cracks radiating from a hinge bolt hole.
• Elongated, oval bolt holes in the steel skin.
• A section edge that flexes outward when the door moves.
• Rust streaks below a hinge, which means water has been sitting in the joint.

How it is properly repaired

Cracked hinges are replaced with the correct numbered part and the correct gauge. Where the end stile itself has torn, a reinforcement stile or strut is added rather than simply re-bolting into damaged steel — a new bolt in a torn hole will pull out again within months.

Wide double doors also benefit from a horizontal strut on the top section, which stops the sag that lets the opener arm pull the section forward.

Preventing the next failure

Hinge pivots and roller stems should be lubricated once a year with a garage-door-rated lubricant — never grease, which collects grit. Torque checks on hinge bolts during an annual service catch loosening before it becomes a crack.