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
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Feature
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Detailed Specification
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Industry Part Number
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3687X / 3687
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Brake Size
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16.50" x 7.00" (419mm x 178mm)
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Mounting Type
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Outboard
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Bolt Hole Count
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10 Holes
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Bolt Circle Diameter (PCD)
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11.25" (285.75mm)
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Pilot Diameter (Center Hole)
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8.78" (223mm)
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Overall Depth
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10.56" (268.2mm)
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Brake Surface Width
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7.61"
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Weight
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Approx. 104 lbs (47.2 kg) - Lightweight Design
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Vehicle Compatibility
The 3687X Brake Drum is widely used across North American heavy-duty truck brands and trailer axle systems:
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Truck Brands: Freightliner, Kenworth, Peterbilt, International (Navistar), and Western Star.
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Trailer Axles: Direct fit for Hendrickson, Meritor, and Dana axle configurations.
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Axle Position: Primarily used on Drive and Trailer axles.
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Cross-Reference & Interchange
This component is a direct replacement for the following industry references:
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Gunite: 3687X, 3687
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Webb: 66864F, 66884
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Meritor: 53-123438-002, 123438
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Dayton: 123438
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Haldex: 3687X
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Fleetrite: FLT3687X
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Key Benefits
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Optimized Weight-to-Strength Ratio: Engineered to be lighter than standard drums without sacrificing the structural integrity of a full cast iron design.
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Superior Heat Sink: The high-carbon metallurgy absorbs and dissipates heat effectively, preventing "brake fade" and surface heat checking.
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Precision Machined & Balanced: Every 3687X drum is dynamically balanced to eliminate wheel vibration and ensure smooth braking from day one.
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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.
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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.
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