Full Cast Iron Brake Drums 3687X Class 8 Heavy Truck Brake Drums
Full Cast Brake Drum 3687X for Class 8 Trucks & Trailers | 16.5" x 7" Outboard Mount
Product Overview
The 3687X Brake Drum is a premium, high-performance solution for heavy-duty commercial vehicles requiring a 16.5" x 7" braking system. Engineered for outboard mount configurations, the 3687X is specifically designed to provide the strength of a full cast drum while maintaining an optimized weight to improve fuel efficiency and payload capacity.
Manufactured from high-carbon G3000 grey iron, our 3687X ensures superior thermal stability and rapid heat dissipation. It is an ideal choice for fleet operators who demand a balance between weight savings and the rugged durability needed for long-haul and vocational applications.
Technical Specifications
|
Feature |
Detailed Specification |
|
Industry Part Number |
3687X / 3687 |
|
Brake Size |
16.50" x 7.00" (419mm x 178mm) |
|
Mounting Type |
Outboard |
|
Bolt Hole Count |
10 Holes |
|
Bolt Circle Diameter (PCD) |
11.25" (285.75mm) |
|
Pilot Diameter (Center Hole) |
8.78" (223mm) |
|
Overall Depth |
10.56" (268.2mm) |
|
Brake Surface Width |
7.61" |
|
Weight |
Approx. 104 lbs (47.2 kg) - Lightweight Design |
Vehicle Compatibility
The 3687X Brake Drum is widely used across North American heavy-duty truck brands and trailer axle systems:
Truck Brands: Freightliner, Kenworth, Peterbilt, International (Navistar), and Western Star.
Trailer Axles: Direct fit for Hendrickson, Meritor, and Dana axle configurations.
Axle Position: Primarily used on Drive and Trailer axles.
Cross-Reference & Interchange
This component is a direct replacement for the following industry references:
Gunite: 3687X, 3687
Webb: 66864F, 66884
Meritor: 53-123438-002, 123438
Dayton: 123438
Haldex: 3687X
Fleetrite: FLT3687X
Key Benefits
Optimized Weight-to-Strength Ratio: Engineered to be lighter than standard drums without sacrificing the structural integrity of a full cast iron design.
Superior Heat Sink: The high-carbon metallurgy absorbs and dissipates heat effectively, preventing "brake fade" and surface heat checking.
Precision Machined & Balanced: Every 3687X drum is dynamically balanced to eliminate wheel vibration and ensure smooth braking from day one.
Reduced Maintenance Costs: High wear resistance extends the service life of both the drum and the brake linings, keeping your trucks on the road longer.
FAQ
Q: What makes the 3687X different from the 3600AX?
A: While both are 16.5" x 7", the 3687X is typically designed to be slightly lighter while maintaining full-cast strength, making it popular for weight-sensitive trailer and truck applications.
Q: Can this drum be used on a steer axle?
A: No. The 3687X is designed for rear drive and trailer axles with a 7-inch width. Steer axles generally require narrower drums (e.g., 5-inch or 6-inch widths).
Q: Is it ready for installation out of the box?
A: Yes. Our drums come pre-balanced and are treated with a protective anti-rust coating. Just clean the friction surface before installation.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.