Approximately 2-7/8" spacing (measured from center of mounting holes to the next) or 4" hole spacing measure across, diagonally
Most modern 7" and 10" Electric Drum brakes use the same standard 4 bolt square flange. (7" brakes are used on 2000# axles, 10" brakes are used on 3500# Axles)
Description
Trailer Brake Backing Plate Flange 2.27" for 3500# Axle, 4 Hole Bolt Square Bracket 2.27" 4 HOLE bolt square bracket Used on 2000# and 3500# LB axles Most modern 7" and 10" Electric Drum brakes use the same standard 4 bolt square flange. (7" brakes are used on 2000# axles, 10" brakes are used on 3500# Axles)