4-Pack Trailer Brake Backing Plate Flange – 3-1/8" Center Hole, 5-Bolt Round Pattern – Weld-On for 5.2K–7K lb Axles – 12" x 2" Drum Brake Compatible – Heavy Duty Steel

This set of four (4) brake backing plate flanges is designed for adding electric or hydraulic drum brakes to trailer axles that lack a factory brake flange. The flanges are made from high‑grade steel and must be welded onto the axle tube. They feature a 3-1/8" center hole, a 5‑bolt round mounting pattern (common on 12" x 2" drum brakes), and are compatible with axles rated from 5,200 lb to 7,000 lb (including 6K and 7K capacities). Each flange measures approximately 4‑1/2" wide x 4‑1/4" tall x 1/4" thick, with bolts on 2‑1/8" centers (accepts 3/8" bolts). Perfect for upgrading non‑brake axles, replacing damaged flanges, or custom trailer builds. Sold as a 4‑pack – enough for two axles (two flanges per axle, one left and one right). Welding required – ensure proper alignment and axle tube fitment before installation.

• 5‑Bolt Round Pattern for 12" x 2" Drum Brakes – Matches the industry‑standard flange used on 5,200–7,000 lb trailer axles, compatible with most electric or hydraulic drum brakes.
• Precision 3-1/8" Center Hole – Fits over axle tubes with the correct diameter for proper brake shoe and magnet clearance.
• Heavy‑Duty Steel Construction – 1/4" thick high‑grade steel resists warping and cracking under braking loads; designed for weld‑on installation.
• Sold as a 4‑Pack for Two Axles – Includes four flanges – enough to add brakes to a tandem‑axle trailer or replace all four flanges on an existing setup.
• Clear Bolt Dimensions – 3/8" bolt holes on 2‑1/8" centers; overall flange size 4‑1/2" x 4‑1/4" ensures a secure, vibration‑resistant brake assembly mount.