Description
6″ x 24″ Heavy Duty Manhole Frame and Cover
The 6″ x 24″ Heavy Duty Manhole Frame and Cover is a municipal-grade cast iron access assembly designed for sanitary sewer systems, stormwater infrastructure, utility vaults, wastewater treatment facilities, and roadway applications. Manufactured from high-strength gray cast iron and engineered for heavy traffic loading, this frame and cover provides safe, reliable access to underground infrastructure while delivering decades of service life.
Designed for use in streets, highways, parking lots, industrial facilities, and municipal utility systems, the 6″ x 24″ Manhole Frame and Cover is suitable for AASHTO H-20 traffic loading and is commonly specified by municipalities, utility authorities, contractors, and engineers. The deep 6-inch frame provides additional structural support and stability in heavy-duty installations while maintaining a 24-inch clear opening for maintenance access.
Product Features
- Heavy-duty cast iron construction
- 24″ clear opening
- 6″ frame height
- Suitable for H-20 traffic loading
- ASTM A48 Class 30 gray iron construction
- Precision-machined seating surface
- Available with plain, sewer, water, storm, or custom markings
- Pick holes for easy cover removal
- Corrosion-resistant asphaltic coating available
- Long service life in municipal environments
- Designed for roadway and utility applications
Common Applications
The 6″ x 24″ Heavy Duty Manhole Frame and Cover is commonly used for:
- Sanitary Sewer Systems
- Storm Drain Structures
- Wastewater Treatment Plants
- Utility Vaults
- Water Distribution Systems
- Lift Stations
- Pump Stations
- Municipal Infrastructure Projects
- Roadway Rehabilitation Projects
- Industrial Facilities
- Parking Lots
- Commercial Developments
Technical Specifications
| Property | Specification |
|---|---|
| Product Type | Manhole Frame and Cover |
| Material | Gray Cast Iron |
| ASTM Specification | ASTM A48 Class 30 |
| Clear Opening | 24″ |
| Frame Height | 6″ |
| Frame Outside Diameter | 34″ |
| Cover Diameter | 24″ |
| Cover Type | Solid Cover |
| Traffic Rating | H-20 Highway Loading |
| Installation | Concrete Structures |
| Finish | Plain or Asphaltic Coating |
The frame and cover assembly is designed to withstand repeated vehicular traffic loads while providing secure access to underground structures. ASTM A48 gray iron castings remain the industry standard for municipal manhole frames and covers because of their durability, compressive strength, and long-term performance.
Dimensional Information
Based on the engineering drawings, the standard assembly dimensions include:
| Dimension | Measurement |
|---|---|
| Clear Opening | 24″ |
| Cover Diameter | 24″ |
| Frame Height | 6″ |
| Frame Outside Diameter | 34″ |
| Cover Seat Diameter | 22⅜” |
| Cover Thickness | Approx. 1⅜” |
| Material | Cast Iron |
Dimensions may vary slightly based on cover marking requirements and project specifications.
Heavy Duty H-20 Loading
This frame and cover is designed for heavy-duty traffic applications and is suitable for installations subjected to highway loading. H-20 loading remains one of the most widely recognized standards for municipal roadway castings and utility infrastructure. Properly installed cast iron manhole castings distribute traffic loads efficiently while protecting underground structures from damage.
ASTM A48 Cast Iron Construction
Manufactured from ASTM A48 Class 30 gray iron, this frame and cover provides exceptional compressive strength, wear resistance, and long-term durability. Gray iron remains the preferred material for municipal manhole castings due to its ability to withstand traffic loading, environmental exposure, and freeze-thaw conditions.
Available Cover Markings
Amercast can supply covers with a variety of cast-in markings, including:
- SANITARY SEWER
- STORM SEWER
- WATER
- ELECTRIC
- TELEPHONE
- COMMUNICATIONS
- FIBER OPTIC
- MUNICIPAL LOGOS
- CUSTOM LETTERING
Custom logos, utility identification, and municipality-specific markings are available upon request.
Custom Manufacturing Options
Amercast specializes in custom municipal castings and can manufacture:
- Custom Cover Markings
- Locking Manhole Covers
- Watertight Covers
- Bolt-Down Covers
- Hinged Covers
- Ductile Iron Castings
- Utility-Specific Castings
- Municipality-Specific Designs
Our engineering team can manufacture products to meet city, county, DOT, utility authority, and project-specific requirements.
Related Products
- Manhole Frames and Covers
- 4″ x 24″ Manhole Frame and Cover
- 3″ x 24″ Septic Manhole Frame and Cover
- 3″ x 24″ Locking Watertight Septic Manhole Frame and Cover
- Adjustable Manhole Risers
- Manhole Risers and Extension Rings
- Catch Basin Grates
- Municipal Castings
Industry Standards
This casting is manufactured in accordance with recognized municipal casting standards and industry best practices for heavy-duty utility access structures. For additional information regarding roadway loading classifications, engineers may reference the American Association of State Highway and Transportation Officials (AASHTO) design standards:
AASHTO Transportation Standards
Why Choose Amercast?
Amercast supplies heavy-duty cast iron manhole frames and covers for municipalities, contractors, utility authorities, engineers, and infrastructure projects throughout North America. Our products are engineered for durability, safety, and long-term performance in demanding environments.
Whether you need a standard 6″ x 24″ assembly, custom markings, locking covers, or project-specific municipal castings, our team can provide a solution tailored to your requirements.
Request a Quote
Need pricing, engineering drawings, custom markings, or delivery information?
Contact Amercast today to request a quote for the 6″ x 24″ Heavy Duty Manhole Frame and Cover. Our team is ready to assist with municipal, utility, commercial, and industrial projects throughout North America.
