8″ x 24″ Heavy Duty Manhole Frame and Cover

The 8″ x 24″ Heavy Duty Manhole Frame and Cover is a municipal-grade cast iron access assembly engineered for roadway infrastructure, sanitary sewer systems, stormwater collection networks, utility vaults, pump stations, and industrial utility structures. Featuring an extra-deep frame profile, precision-machined bearing surfaces, and H-20 highway loading capability, this casting is designed to provide superior structural stability in demanding traffic environments.

Manufactured from ASTM A48 Class 30 gray iron, the 8″ x 24″ assembly combines a robust frame section with a 24-inch access opening to accommodate maintenance personnel, inspection equipment, and utility service operations. The deeper frame configuration provides increased embedment within concrete structures, making it particularly well suited for roadway reconstruction projects, resurfacing programs, and applications requiring enhanced load transfer.

In addition to standard frame and cover configurations, this casting may be supplied with bolt-down security hardware, watertight sealing systems, and multiple cover styles to meet utility authority, municipal, and engineering specifications.

Product Features

• ASTM A48 Class 30 gray iron construction
• AASHTO H-20 highway loading
• Deep 8″ frame profile
• 24″ access opening
• Precision-machined seating surfaces
• Stable non-rocking cover design
• (2) Integrated 1½″ pick holes
• Optional bolt-down security system
• Optional watertight gasket configuration
• Multiple cover styles available
• Utility-specific cast-in markings
• Compatible with precast and cast-in-place structures
• Suitable for roadway and utility applications

Typical Applications

The 8″ x 24″ Heavy Duty Manhole Frame and Cover is commonly utilized in:

• Sanitary Sewer Systems
• Stormwater Collection Networks
• Combined Sewer Systems
• Utility Vaults
• Electrical Access Structures
• Telecommunications Chambers
• Fiber Optic Infrastructure
• Pump Stations
• Lift Stations
• Wastewater Treatment Facilities
• Flow Meter Vaults
• Valve Chambers
• Industrial Utility Corridors
• Transportation Infrastructure Projects

The deep frame configuration makes this casting particularly beneficial in applications where increased frame embedment and structural engagement are required.

Technical Specifications

Dimensional Information

These dimensions provide substantial bearing area while maintaining a compact footprint suitable for municipal, utility, and transportation applications.

Deep Frame Design Advantages

Unlike standard shallow-frame castings, the 8″ profile provides increased engagement with supporting concrete structures. This additional depth improves load transfer characteristics and enhances long-term installation stability under repeated traffic loading.

Enhanced Structural Engagement

The deeper frame section distributes applied loads over a larger supporting area, helping reduce concentrated stress within the surrounding concrete structure.

Improved Roadway Performance

Deep-frame castings are frequently selected for roadway reconstruction projects, resurfacing programs, and transportation infrastructure where long-term stability is critical.

Reduced Maintenance Requirements

Additional frame embedment helps minimize movement caused by traffic vibration, thermal cycling, and environmental conditions.

Long-Term Reliability

The robust frame geometry provides dependable performance in heavily trafficked municipal and industrial environments.

Watertight and Bolt-Down Configurations

The engineering drawing includes provisions for a watertight frame section utilizing four tapped bolt holes designed for 5/8″ UNC hardware.

Benefits include:

• Reduced infiltration and inflow (I&I)
• Enhanced utility security
• Improved flood protection
• Odor containment
• Prevention of unauthorized access
• Increased public safety

Watertight assemblies are commonly specified for wastewater facilities, lift stations, flood-prone areas, and environmentally sensitive installations.

Available Cover Configurations

Amercast can manufacture this frame with several cover styles depending on project requirements.

These options allow engineers and municipalities to utilize a common frame while tailoring the cover configuration to specific site requirements.

Material Performance Characteristics

Gray cast iron remains one of the most widely utilized materials for municipal access castings because of its proven performance under sustained loading and harsh environmental exposure.

Utility Markings Available

Amercast can provide cast-in markings including:

• SANITARY SEWER
• STORM
• DRAIN
• WATER
• ELECTRIC
• TELECOMMUNICATIONS
• FIBER OPTIC
• GAS
• RECLAIMED WATER
• MUNICIPAL LOGOS
• CUSTOM LETTERING

Custom utility branding and agency-specific identification are available upon request.

Custom Manufacturing Capabilities

Amercast manufactures custom municipal castings for infrastructure projects throughout North America.

Available customizations include:

• Locking Covers
• Watertight Assemblies
• Custom Cover Markings
• Ductile Iron Options
• Utility-Specific Castings
• DOT Specifications
• Transit Authority Castings
• Custom Logos
• Special Coatings
• Project-Specific Designs

Our engineering team routinely works with municipalities, consulting engineers, contractors, utility districts, and transportation agencies to develop products that meet exact project specifications.

Related Products

• Manhole Frames and Covers
• 6″ x 24″ Heavy Duty Manhole Frame and Cover
• 6″ x 24″ Locking Watertight Manhole Frame and Cover
• 3″ x 24″ Septic Manhole Frame and Cover
• Adjustable Manhole Risers
• Manhole Risers and Extension Rings
• Catch Basin Grates
• Municipal Castings

Industry Resource

For additional guidance regarding wastewater collection systems, utility infrastructure, and underground access structures:

Water Environment Federation (WEF)

The Water Environment Federation provides technical resources, engineering guidance, and industry best practices related to water and wastewater infrastructure.

Why Choose Amercast?

Amercast supplies municipal castings engineered for transportation agencies, public works departments, utility authorities, consulting engineers, contractors, and infrastructure owners throughout North America. Our products are designed to provide reliable access, superior load-bearing performance, and long-term service in demanding environments.

Whether your project requires standard roadway castings, custom utility markings, watertight assemblies, or project-specific engineering solutions, Amercast has the manufacturing capabilities to support your requirements.

Request a Quote

Need pricing, engineering drawings, submittal packages, custom markings, locking hardware, or watertight configurations?

Contact Amercast today to request a quote for the 8″ x 24″ Heavy Duty Manhole Frame and Cover. Our team can assist with municipal, transportation, utility, wastewater, and industrial infrastructure projects throughout North America.