✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Notice: This item requires extra freight costs, which are not calculated at checkout. We’ll email a payment link for these costs after you submit your order.
Description
WD51 Country Style Manhole Frame – Heavy-Duty, MWSB-Approved Cast Iron
The WD51 Country Style Manhole Frame is a municipal-grade, MWSB-approved cast-iron frame engineered for long-term reliability across rural and urban infrastructure. Built from ASTM A48 Class 30B gray cast iron, this frame delivers the structural integrity required for municipal service environments while maintaining compatibility with standard 20.75" covers.
Reinforced with 12 evenly spaced structural ribs (visible in the plan view on page 1 of the drawing) and designed with a 10° seating taper, the WD51 ensures strong ground engagement and stability — especially valuable in rural, gravel, or mixed-base installations.
At 89 kg (197 lbs.), the frame provides a stable, secure installation footprint that meets the expectations of municipalities and contractors working under MWSB standards.
Technical Specifications – WD51 Country Style Manhole Frame (MWSB Approved)
| Specification | Value |
|---|---|
| Model | WD51 |
| Approval | MWSB Approved |
| Style | Country Style Manhole Frame |
| Material | Gray Cast Iron – ASTM A48, Class 30B |
| Outside Diameter | 838 mm (33") |
| Inside Diameter / Opening | 527 mm (20.75") |
| Overall Height | 165 mm (6.5") |
| Frame Lip Height | 30 mm (1.1875") |
| Top Surface Thickness | 16 mm (0.625") |
| Upper Inside Height | 102 mm (4") |
| Reinforcement | 12 ribs, evenly spaced |
| Taper Angle | 10° (per Section A-A) |
| Weight | 89 kg (197 lbs.) |
Frequently Asked Questions (FAQs)
1. What makes the WD51 a “Country Style” manhole frame?
The WD51 uses a rib-reinforced exterior design optimized for rural or low-pavement environments. The ribs anchor the frame into granular or mixed-base surfaces to prevent movement under vehicle load.
2. What material is the WD51 made from?
It is cast from ASTM A48 Class 30B gray iron, providing strong compressive strength and long-term durability in buried and surface-load applications.
3. What size manhole cover fits this frame?
The inside clear opening is 527 mm (20.75"), which aligns with standard municipal 20.75" covers.
4. Is this frame suitable for paved roads?
Yes, although it excels in rural applications, it performs well under municipal load requirements due to its structural design and cast-iron composition.
5. How much does the WD51 frame weigh?
The frame weighs 89 kg (197 lbs.), ensuring stable seating while remaining manageable for field crews.
6. Does the frame come with a lid or cover?
No — the WD51 is sold as the frame only. Compatible lids can be supplied independently.
7. Can this frame be used for retrofit projects?
Yes. Its 33" outside diameter and standard 20.75" opening allow it to be used for new installations or as a drop-in replacement where the site dimensions align.
8. Does the frame have a built-in taper?
Yes — Section A-A shows a 10° taper, which supports debris shedding and enhances long-term seating stability.
9. Are the reinforcement ribs functional or cosmetic?
Functional. The 12 evenly spaced ribs provide structural rigidity and optimized support in granular backfill, preventing rotation or uplift.
Manuals & Documentation
✅ This item is normally regularly stocked. Shipping times may vary depending on availability. Please contact us to confirm stock and shipping times. You will receive tracking details once the item has shipped.
Notice: This item requires extra freight costs, which are not calculated at checkout. We’ll email a payment link for these costs after you submit your order.
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