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HOWO Shacman FAW Truck Rubber Bracket Az9725520278 Rear Leaf Spring Rubber Support

The AZ9725520278 Rear Leaf Spring Rubber Support, commonly known as a Rubber Hollow Spring or Rubber Buffer Block, is a critical suspension component designed for SINOTRUK (China National Heavy Duty Truck Group) HOWO series heavy-duty commercial vehicles. It is installed between the rear leaf spring pack and chassis frame, serving as a load-bearing buffer that absorbs road shocks, limits excessive spring travel, and prevents metal-to-metal impact under heavy loads.

This rubber support plays a vital role in enhancing ride comfort, protecting the chassis structure from stress cracking, and extending the service life of both the suspension system and axle assembly. Widely used in dump trucks and mining vehicles operating under extreme conditions, it combines high elasticity with structural strength through advanced rubber-to-steel bonding technology.
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  • AZ9725520278

  • Shacman Sinotruk HOWO FAW

Attribute Description
Product Name Rear Leaf Spring Rubber Support Assembly
Common Names Rubber Seat, Hollow Rubber Spring, Suspension Buffer Block, Rubber Mount
Function Provides cushioning and limiting support between leaf spring and frame
Position Installed at rear suspension mounting points (top/bottom)
Design Type Cylindrical laminated rubber-steel composite with central bolt hole
Application Type Heavy-Duty Trucks, Dump Trucks, Mining Vehicles, Off-Road Equipment
橡胶支架 -2


橡胶支架 -3


Parameter Specification
OEM Part Number AZ9725520278
Alternative Numbers
• WG9725520278 (aftermarket supplier code)
• AZ9725520276 (tractor variant – different stiffness)
• AZ9725520274 (older version for 1697 axle)
Dimensions (L × W × H) Approx. 240 mm × 180 mm × 150 mm (24 × 18 × 15 cm)
Weight per Unit 13.5 kg – 14.5 kg (varies based on internal reinforcement level)
Rubber Hardness 75–80 Shore A (high elasticity, anti-fatigue formula)
Tensile Strength 24–26 MPa
Material Composition
• Outer/Inner: High-quality natural rubber (oil-resistant & weatherproof)
• Internal Structure: 7–10 layers of manganese steel plates (2025 reinforced version)
• Bonding Process: High-temperature vulcanization for permanent adhesion
Center Bolt Bore Compatible with M24 or M27 center locating bolts
Load Capacity Designed for multi-leaf spring systems under 30+ ton GVW
Operating Temperature Range -40°C to +90°C (enhanced cold resistance in 2025 models)
Performance Features Variable stiffness, vibration absorption, noise reduction, anti-impact protection


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