Heavy-Duty Brake Drum 3800AX | 16.5" x 8.625" Outboard Mount for Class 8 Trucks & Trailers
Product Overview
The 3800AX Brake Drum is a premium, full-cast braking component designed for heavy-duty commercial vehicles requiring maximum stopping power. Specifically engineered for 16.5" x 8.625" brake systems, the 3800AX is the industry standard for drive axles and heavy-capacity trailers where heat dissipation is critical.
Manufactured from high-carbon G3000 (GG25) grey iron, our 3800AX drum is built to withstand extreme thermal loads without cracking or warping. Its outboard mount design ensures ease of service, making it a favorite for fleet operators managing Freightliner, Kenworth, and Peterbilt trucks.
Technical Specifications
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Attribute
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Detailed Specification
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Industry Part Number
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3800AX / 3800A
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Brake Size
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16.50" x 8.625" (419mm x 219mm)
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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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11.12" (282.5mm)
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Brake Surface Width
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9.06"
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Material
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Premium High-Carbon G3000 Iron
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Weight
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Approx. 125 lbs (56.7 kg)
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Vehicle Compatibility
The 3800AX Brake Drum is a direct fit for a wide range of North American Class 8 heavy-duty applications:
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Truck Brands: Freightliner (Cascadia), Kenworth (T680/T800), Peterbilt (579/389), International, and Western Star.
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Axle Manufacturers: Compatible with Meritor, Dana (Spicer), and Hendrickson heavy-duty axle systems.
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Axle Position: Primarily used on Drive Axles and Heavy-Duty Trailer Axles.
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Cross-Reference & Interchange
This product is a direct interchangeable replacement for the following reference numbers:
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Gunite: 3800AX, 3800A, 3800
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Webb: 68730, 68730B, 68730F
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Meritor: 53-123565-002, 123565
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Dayton: 123565
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Haldex: 3800AX
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Fleetrite: FLT3800AX
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Key Benefits
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Maximum Heat Sink Capacity: The extra-wide friction surface and high-carbon metallurgy provide superior heat absorption, preventing "brake fade" during heavy hauling.
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Precision Dynamic Balancing: Every 3800AX is balanced to strict tolerances (G16 grade) to eliminate wheel vibration and prevent premature wear on hub seals and tires.
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Structural Stability: The reinforced mounting flange is designed to resist distortion under extreme torque, ensuring a consistent pedal feel and even lining wear.
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Anti-Corrosion Finish: Treated with a specialized coating to resist road salt and environmental corrosion, maintaining structural integrity and ease of removal.
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FAQ
Q: What is the difference between 3800AX and 3600AX?
A: The main difference is the width. The 3800AX is designed for an 8.625" brake shoe (Wide Brake), while the 3600AX is for a standard 7" shoe. They are not interchangeable.
Q: Can this drum be used on 23,000 lb axles?
A: Yes, the 3800AX is specifically engineered for high-capacity axles (23k and above) that require the wider braking surface for better thermal management.
Q: Is the 3800AX a "Full Cast" drum?
A: Yes, our 3800AX is a one-piece full cast iron drum, offering the best heat conductivity and structural rigidity for heavy-duty vocational and long-haul use.
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