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Bolt Size
Sectional Overhead Garage Door Hardware - Bolts with Nuts Items per page:  
GD 52103 - Carriage Bolts With Nuts, 1/4"-20 x 1-7/8", Zinc Plated
Zinc plated bolts; used to attach most hardware to garage doors; flat head allows or smooth exterior finish.
GD 52265 - Ribbed Neck Bolts With Nuts, 1/4"-20 x 1/2"
Slotted, zinc plated 1/4"-20x1/2" bolts and hex nuts; used on fiberglass garage doors.