Description
8″ x 24″ Bolted Manhole Frame and Cover
The 8″ x 24″ Bolted Manhole Frame and Cover is a mechanically secured cast iron access assembly designed for municipal utility systems, transportation infrastructure, wastewater facilities, utility vaults, and other critical underground structures requiring enhanced cover retention and controlled access. Featuring an 8-inch deep frame profile, precision-machined seating surfaces, and a positive bolt-down fastening system, this assembly provides a secure and dependable access solution for installations subjected to traffic loading, vibration, and demanding environmental conditions.
Manufactured from ASTM A48 Class 30 gray iron and designed for AASHTO H-20 highway loading, this casting combines structural strength with operational security. The bolted design helps maintain cover position, reduces movement caused by traffic vibration, and provides an added layer of protection for critical infrastructure assets.
Frequently specified for lift stations, utility chambers, treatment facilities, transportation corridors, and municipal utility systems, the 8″ x 24″ Bolted Manhole Frame and Cover delivers reliable performance while supporting long-term infrastructure management objectives.
Product Features
- Mechanical bolt-down cover system
- 8″ deep frame profile
- ASTM A48 Class 30 gray cast iron
- AASHTO H-20 highway loading
- Precision-machined bearing surfaces
- Enhanced cover retention
- Stable non-rocking cover design
- Suitable for roadway installations
- Available with custom utility markings
- Optional asphaltic protective coating
- Compatible with precast and cast-in-place structures
- Long-term infrastructure durability
- Custom logo options available
Secure Access for Critical Infrastructure
Underground utility structures often contain equipment, controls, communications systems, monitoring devices, and operational assets that require controlled access. A bolted cover assembly provides a positive fastening method that helps maintain cover placement while limiting unauthorized entry.
Unlike conventional loose-seated covers, mechanically secured systems create a more reliable connection between the frame and cover. This makes them particularly well-suited for installations where infrastructure protection, public safety, and operational security are priorities.
Typical applications include wastewater facilities, transportation infrastructure, communications networks, utility compounds, municipal systems, and industrial operations.
Common Applications
The 8″ x 24″ Bolted Manhole Frame and Cover is commonly installed in:
Lift Stations
Secure access to pumping infrastructure while helping protect critical mechanical and electrical components.
Utility Vaults
Provides controlled access to electrical, telecommunications, fiber optic, and utility distribution systems.
Transportation Infrastructure
Used in streets, highways, parking facilities, and transportation corridors where cover stability is essential.
Wastewater Treatment Facilities
Helps secure access points associated with collection systems, treatment operations, and plant infrastructure.
Water Distribution Systems
Suitable for access structures associated with valves, monitoring equipment, and utility service components.
Industrial Facilities
Frequently specified for manufacturing plants, ports, logistics centers, and other facilities requiring dependable utility access.
Technical Specifications
| Property | Specification |
|---|---|
| Product Type | Bolted Manhole Frame & Cover |
| Material | Gray Cast Iron |
| ASTM Standard | ASTM A48 Class 30 |
| Traffic Classification | AASHTO H-20 |
| Cover Diameter (C) | 24″ |
| Clear Opening (E) | 23.5″ |
| Frame Inside Diameter (F) | 25″ |
| Outside Frame Diameter (G) | 34″ |
| Frame Depth (D) | 8″ |
| Cover Thickness (H) | 1.5″ |
| Cover Retention | Mechanical Bolt System |
| Installation | Concrete Structures |
Engineering Dimensions
| Dimension | Description | Measurement |
|---|---|---|
| C | Cover Diameter | 24″ |
| D | Frame Depth | 8″ |
| E | Clear Opening | 23.5″ |
| F | Frame Inside Diameter | 25″ |
| G | Outside Frame Diameter | 34″ |
| H | Cover Thickness | 1.5″ |
The dimensional configuration provides substantial bearing area while maintaining efficient access for maintenance personnel and service equipment.
Structural Benefits of an 8-Inch Frame Profile
Frame depth plays an important role in how loads are transferred from the casting into the surrounding structure. The 8-inch profile utilized in this assembly provides increased contact area within the supporting concrete and allows the casting to remain stable under demanding service conditions.
The additional depth can be particularly advantageous in roadway reconstruction projects, utility rehabilitation programs, and installations where pavement buildup or elevation adjustments are anticipated.
Benefits include:
- Improved structural engagement
- Enhanced support within concrete structures
- Increased resistance to movement
- Better performance under cyclical traffic loading
- Greater adaptability to rehabilitation projects
- Long-term installation stability
Mechanical Properties of ASTM A48 Gray Iron
The frame and cover are manufactured from ASTM A48 Class 30 gray iron, a material widely utilized throughout North American infrastructure because of its proven durability and compressive strength.
Gray iron performs exceptionally well in access structure applications where castings must withstand continuous wheel loads, seasonal temperature fluctuations, and decades of field exposure.
| Property | Performance |
|---|---|
| Load Bearing Capability | Excellent |
| Surface Wear Resistance | Excellent |
| Dimensional Stability | Excellent |
| Environmental Durability | High |
| Structural Integrity | High |
| Long-Term Reliability | Excellent |
Utility Markings Available
Amercast can provide cast-in utility identification including:
- SANITARY SEWER
- STORM
- DRAIN
- WATER
- ELECTRIC
- COMMUNICATIONS
- TELEPHONE
- GAS
- FIBER OPTIC
- RECLAIMED WATER
- MUNICIPAL IDENTIFICATION
- CUSTOM LETTERING
Municipal logos, agency seals, utility branding, and project-specific markings are available upon request.
Available Project Enhancements
Every infrastructure project presents unique operational requirements. Amercast can furnish this casting with a variety of enhancements designed to improve security, maintenance accessibility, and environmental performance.
Available options include:
- Stainless Steel Hardware Packages
- Security Fasteners
- Tamper-Resistant Bolts
- Utility Identification Markings
- Agency-Specific Logos
- Corrosion Protection Systems
- Water-Exclusion Gaskets
- Specialty Protective Coatings
- Custom Casting Modifications
- Alternative Material Grades
These enhancements allow engineers and infrastructure owners to specify a casting configuration that aligns with project objectives and operating conditions.
Custom Municipal Casting Solutions
Amercast manufactures cast iron infrastructure products for municipalities, utility authorities, transportation agencies, consulting engineers, contractors, and industrial operators throughout North America.
Custom manufacturing capabilities include:
- Utility Access Covers
- Security Covers
- Locking Assemblies
- Watertight Systems
- Transit Authority Castings
- DOT Castings
- Utility Authority Standards
- Municipal Logo Castings
- Special Access Configurations
- Project-Specific Engineering Designs
Our team routinely works with public agencies and consulting engineers to develop products that satisfy exact project specifications.
Related Products
- Manhole Frames and Covers
- 8″ x 24″ Heavy Duty Manhole Frame and Cover
- 8″ x 24″ Locking Watertight Manhole Frame and Cover
- 6″ x 24″ Heavy Duty Manhole Frame and Cover
- Adjustable Manhole Risers
- Manhole Risers and Extension Rings
- Catch Basin Grates
- Municipal Castings
Industry Resource
For additional information regarding public infrastructure management, utility access systems, and municipal engineering best practices:
American Public Works Association (APWA)
APWA provides technical resources, standards guidance, and educational materials related to public works infrastructure throughout North America.
Engineered for Long-Term Utility Service
Amercast manufactures cast iron infrastructure products designed to support the operational demands of municipalities, utility providers, transportation agencies, and industrial facilities throughout North America.
Our experience producing access castings for a wide variety of underground systems allows us to provide products that balance structural performance, installation practicality, and long-term durability.
Whether your project requires standard utility castings, custom-marked covers, security-enhanced assemblies, or agency-specific designs, Amercast can provide a solution tailored to your specifications.
Request Engineering Assistance or Pricing
Whether you’re designing a new utility system, replacing existing castings, or developing specifications for a public infrastructure project, Amercast can help identify the appropriate frame and cover assembly for your application.
Contact our team today for product recommendations, technical information, shop drawings, custom casting options, and project pricing for the 8″ × 24″ Bolted Manhole Frame and Cover.
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