Weld-On 5-Bolt Brake Backing Plate Flange for 12" x 2" Trailer Brakes
High-grade steel brake mounting flange with a 3-1/8" center opening. Designed for compatible 12" x 2" trailer drum brake applications using the common round 5-bolt mounting pattern.
Key Measurements & Specs
| Specification | Detail |
|---|---|
| Part Number | BF-6-1 |
| Product Type | Weld-on brake backing plate flange |
| Brake Size | Compatible 12" x 2" drum brakes |
| Mounting Pattern | Round 5-bolt |
| Center Opening | 3-1/8" diameter |
| Overall Size | 4-1/2" wide x 4-1/4" high |
| Corner to Corner | 5" |
| Thickness | 1/4" |
| Mounting Holes | For common 3/8" bolts |
| Hole Spacing | 2-1/8" center to center between adjacent mounting holes |
| Material | High-grade steel |
| Quantity Included | One brake mounting flange |
Fitment / Application
| Category | Details |
|---|---|
| Brake Application | Compatible 12" x 2" trailer drum brakes |
| Common Axle Classes | Commonly used with 5,200 lb, 6,000 lb and 7,000 lb axle applications |
| Primary Use | Adding a compatible brake mounting flange or replacing a damaged flange |
| Installation | Must be welded to the axle |
| Fitment Check | Verify the center opening, flange dimensions, bolt pattern and brake mounting measurements before ordering |
| Important Note | Axle capacity alone does not confirm fitment. Match the actual brake and flange measurements. |
Top Features
| Feature | Buyer Benefit |
|---|---|
| Round 5-Bolt Pattern | Matches compatible 12" x 2" trailer brake assemblies |
| 3-1/8" Center Opening | Provides a clear measurement for checking axle tube and spindle-area compatibility |
| 1/4" Steel Construction | Provides a substantial mounting surface for a properly welded installation |
| Repair or Conversion Use | Can be used when adding compatible brakes or replacing a damaged mounting flange |
Overview
The BF-6-1 is a weld-on steel backing plate flange for compatible 12" x 2" trailer drum brakes. It uses the common round 5-bolt mounting pattern frequently found on 5,200 lb, 6,000 lb and 7,000 lb axle applications. It may be used when adding compatible brakes to an axle without mounting flanges or when replacing a damaged flange.
R&P Service Insight
Correct flange alignment is essential for proper brake installation and operation. This component must be positioned and welded accurately.
- Measure First: Confirm the 3-1/8" center opening and round 5-bolt pattern against the existing axle and brake assembly.
- Check Brake Size: This flange is intended for compatible 12" x 2" brakes, not the square 4-bolt pattern commonly associated with many 7" and 10" brakes.
- Professional Installation: Welding and alignment should be completed by a qualified trailer or axle repair professional.
R&P Knowledge Hub
Compatibility: Designed for compatible 12" x 2" trailer drum brakes using a round 5-bolt mounting flange.
Axle Application: This flange style is commonly used on 5,200 lb, 6,000 lb and 7,000 lb trailer axle applications. Capacity is only an application reference and does not guarantee fitment.
Pattern Difference: Many modern 7" and 10" trailer drum brakes use a square 4-bolt flange. This BF-6-1 flange uses a different round 5-bolt configuration.
Installation Notes: Confirm flange position, alignment and brake-to-drum relationship before final welding.
Brand & Fitment Note
Selling Brand: R&P Carriages
Part Number: BF-6-1
Application Reference: Axle capacities and brake sizes listed here describe common applications only.
Before Ordering: Verify the 3-1/8" center opening, overall flange dimensions, round 5-bolt pattern, mounting-hole spacing and brake size against the parts being installed.
R&P Repair Insight
A brake flange is a structural mounting point. Its location and alignment affect how the backing plate, shoes and drum operate together.
- Do Not Match by Capacity Alone: Two axles with the same listed capacity may use different tube sizes, spindles or brake mounting patterns.
- Inspect the Axle: Confirm the axle and spindle area are suitable for the intended brake installation before welding.
- Final Alignment: Test-fit the brake assembly and verify its position relative to the hub and drum before completing the weld.
Features
High-Grade Steel
Made from 1/4"-thick steel for use as a weld-on trailer brake mounting flange.
Round 5-Bolt Design
Configured for compatible 12" x 2" trailer drum brake assemblies using the common round 5-bolt pattern.
Defined Fitment Measurements
Features a 3-1/8" center opening, 4-1/2" width and 4-1/4" height for pre-purchase measurement checks.
Repair and Brake-Addition Applications
Suitable for compatible axle repair work or for adding a mounting point where the axle does not currently have one.
Included Components
| Quantity | Item |
|---|---|
| 1 | BF-6-1 weld-on round 5-bolt brake backing plate flange |
| Not Included | Brake assembly, mounting bolts, hub, drum, spindle, axle tube and welding services |
