277311 Heavy Truck Brake Drums Mack Trailer Brake Drum 16.5X7" Outboard Mount

Heavy-Duty Brake Drum 277311 for Mack Trucks & Trailers | 16.5" x 7" Outboard Mount

Product Overview

Our 277311 Brake Drum is a premium-grade replacement part engineered for Class 8 heavy-duty trucks and commercial trailers. Specifically designed for outboard mounting, this drum offers superior structural integrity and heat dissipation capabilities.

Manufactured from G3000 high-tensile grey iron, it is built to withstand the rigorous braking demands of long-haul transportation. Each drum undergoes precision machining to ensure consistent contact between the drum and the brake lining, providing reliable stopping power while reducing maintenance intervals.

Technical Specifications

Vehicle Compatibility

The 277311 Brake Drum is widely used across the North American trucking industry, primarily fitting:

Mack Trucks: Granite, CH, CL, and Vision series.

Trailer Axles: Compatible with Hendrickson, Meritor, and Dana 23,000 lb. axle ratings.

Application: Ideal for rear drive axles and heavy-duty trailer applications.

Cross-Reference & Interchange

This product is a direct replacement for the following industry reference numbers:

Mack: 277311, 21QS364, 21QS364P2

Webb: 61528, 61528B

Gunite: 3135X, 3600A

Meritor: 53-123385-002

Dayton: 123385

Key Benefits

Enhanced Heat Sink Capacity: The heavy-duty casting acts as an effective thermal reservoir, preventing brake fade during steep descents.

Precision Dynamic Balancing: Each 277311 drum is balanced to strict tolerances to eliminate hub vibration and protect wheel seals.

Extended Wear Life: Optimized metallurgical properties (High Carbon content) reduce "heat checking" and surface cracking.

OEM Fitment: Designed as a direct bolt-on replacement, ensuring zero modification is needed during fleet maintenance.

FAQ

Q: Is the 277311 drum suitable for steer axles?A: This drum is primarily designed for rear drive and trailer axles due to its 7-inch width and high-mass casting. Please check your axle specifications for front-axle compatibility.

Q: Does it come with a protective coating?A: Yes, our drums are treated with a specialized anti-corrosion finish to prevent rust during shipping and storage.

Q: How often should I inspect the 277311 drum for wear?A: We recommend inspection during every brake pad change. Replace the drum if it exceeds the maximum diameter marked on the outer casting.