Meta Title: The Ultimate Guide to Cast Iron Drain Cover Sizes (2026) – Standards, Specifications & Sourcing from China
The Ultimate Guide to Cast Iron Drain Cover Sizes (2026): Standards, Specifications & Sourcing from China
If you need to know “cast iron drain cover sizes” for your next B2B procurement, you’re not alone. Import managers, brand owners, and wholesalers consistently seek reliable sizing data that meets US infrastructure standards (AASHTO H20, HS20-44) and international norms (EN124). In 2026, cast iron drain covers come in round diameters from 300 mm to 900 mm, square sizes from 300×300 mm up to 800×800 mm, and heavy-duty classes for roads, airports, and ports. At Shijiazhuang TJJ TRADE CO.,LTD., we manufacture and export custom drain covers with precise dimensions, load ratings up to F900, and full ISO 9001:2015 certification. This guide covers everything you need to spec, order, and receive the right product – from standard sizes to OEM design and logistics.
Senior Product Engineer – Shijiazhuang TJJ TRADE CO.,LTD. | 15+ years in iron casting & international supply chain
Common Challenges When Sourcing Cast Iron Drain Covers in 2026
USA import managers, brand owners, and sourcing agents regularly face these pain points:
- Incorrect sizing leading to field failures: Many suppliers lack clear size data, resulting in covers that don’t fit frames or meet traffic load ratings.
- Compliance gaps: Without ASTM, AASHTO, or EN124 certification, products fail municipal or construction inspections.
- Long lead times and poor communication: Delays in production and shipping disrupt project schedules.
- Hidden MOQ requirements: Some factories demand large minimum orders, locking out smaller buyers.
- Limited customization: Many suppliers only offer standard sizes, ignoring OEM/ODM needs such as logos, unique dimensions, or specific coatings.
How Shijiazhuang TJJ Solves These Problems – Precision Sizing, Full Compliance & Fast Delivery
With over 20 years of foundry experience, we have developed a systematic approach to cast iron drain cover sizes that meets the varied needs of US and global buyers:
- Exact dimensional drawings for every standard size; 3D verification prior to production.
- Third-party load testing per EN124 (A15–F900) and AASHTO H20/HS20-44.
- Flexible MOQ: As low as 50 pieces for standard sizes; higher MOQ for custom designs.
- OEM/ODM capabilities: Engrave your brand, choose custom shapes, add anti-theft locks, or specify ductile iron upgrades.
- Express shipping options: 25–35 days for standard orders; expedited available.
Our foundry floor in Hebei Province – ISO 9001 certified, capable of producing drain covers up to 900mm diameter.
Standard Cast Iron Drain Cover Sizes – Complete Reference Table
Below are the most commonly requested sizes for round and square covers. All dimensions are in millimeters (mm) unless noted. Load classes follow EN124, with equivalent US H20 ratings noted.
Round Cast Iron Drain Covers
| Diameter (mm) | Load Class (EN124) | US Equivalent (AASHTO) | Clear Opening (mm) | Weight (kg) |
|---|---|---|---|---|
| 300 | A15 | H10 (pedestrian) | 270 | 8 |
| 400 | B125 | H15 | 360 | 15 |
| 500 | C250 | H20 (standard road) | 460 | 28 |
| 600 | D400 | HS20 (heavy road) | 550 | 42 |
| 750 | E600 | Airport runways | 700 | 78 |
| 900 | F900 | Ports/container yards | 840 | 125 |
Note: Weight and clear opening may vary slightly by design. Please refer to actual order confirmation for exact specifications.
Square Cast Iron Drain Covers
| Size (mm×mm) | Load Class (EN124) | US Equivalent | Clear Opening (mm) | Weight (kg) |
|---|---|---|---|---|
| 300×300 | A15 | H10 | 260×260 | 12 |
| 400×400 | B125 | H15 | 350×350 | 22 |
| 500×500 | C250 | H20 | 440×440 | 38 |
| 600×600 | D400 | HS20 | 530×530 | 58 |
| 800×800 | E600 | Airport heavy | 730×730 | 112 |
Note: Square covers often require a matching frame; we provide both as a unit. Load ratings are tested per EN124 and applicable US standards.
Quality control: every cast iron drain cover is dimensionally measured and load tested before shipment.
cast iron drain cover and frame cast iron covers cast iron stove cover suppliers
Certifications, MOQ, Lead Time & OEM Support That Build Trust
Compliance & Testing
- ISO 9001:2015 – Quality management system since our founding in 2003.
- EN124 (A15–F900) and AASHTO H20/HS20-44 load rating compliance (third-party testing available).
- CE marking for EU export; we can also meet ASTM A48 material specifications for US projects.
- Custom certifications: If your contract requires specific test reports (e.g., FHWA, NCHRP), we coordinate with accredited labs.
Commercial Terms
| MOQ | 50 pcs per size/type (standard sizes). Custom/OEM designs: 200–500 pcs depending on complexity. |
| Lead Time | 25–35 days for stock sizes; 35–50 days for custom molds and production. |
| OEM/ODM | Engrave your logo, modify dimensions, add anti-theft locks, specify ductile iron (GGG50) or grey iron (GG25). |
| Packaging | Heavy-duty wooden pallets, steel strapping, waterproof wrapping. Fumigation certificate (IPPC) available. |
| Logistics | FOB Tianjin or CIF to any US port (Los Angeles, Houston, Savannah, New York). We handle all export documentation. |
| After-Sales | 12-month warranty against manufacturing defects. Dedicated English-speaking account manager. |
All commercial terms are indicative and confirmed in writing at the time of order. MOQ and lead time may vary with market demand.
Why Import Managers Choose TJJ for Cast Iron Drain Cover Sizes
We don’t just list sizes – we provide engineering support for your specific application. Consider these scenarios:
- Municipal roadway project (Chicago): Needed D400 round covers, 600mm diameter, with bi‑directional locking. We supplied 1,200 units in 32 days, each tested to HS20-44 load.
- Parking garage developer (Texas): Required 500×500 mm square covers, C250, with custom diamond pattern for slip resistance. Our team adjusted the pattern in CAD and produced in 28 days.
- Wholesaler (Florida): Ordered mixed container of sizes 300–600 mm round covers for inventory. We arranged consolidated shipment with 14% freight savings.
Data point: Over 95% of our drain cover orders meet dimensional tolerances within ±1.5 mm, verified by coordinate measuring machines (CMM).
Warehouse inventory of standard cast iron drain cover sizes ready for loading.
What Our US & Global Clients Say
Robert L., Import Manager – New York
"TJJ supplied 500mm D400 covers for a Brooklyn infrastructure project. The sizing was spot‑on, and the load test reports matched our requirements. Their communication is top‑notch."
Maria G., Brand Owner – California
"We wanted custom‑engraved covers for a residential landscape line. TJJ helped us design a new size: 350mm round with a decorative flange. The MOQ was reasonable, and the samples were perfect."
David K., Wholesaler – Texas
"I’ve sourced drain covers from three Chinese foundries. TJJ has the most consistent sizing and the fastest lead times. We now stock 600mm D400 covers from them exclusively."
Andrew P., Sourcing Agent – UK
"TJJ’s EN124 compliance was verified by our third‑party inspector. The covers fit perfectly into our municipal frames. Highly recommended for heavy‑duty projects."
* Reviews are based on actual feedback collected from clients. Some names have been changed for privacy.
Ready to Order Cast Iron Drain Covers with Guaranteed Sizes & Quality?
Contact Shijiazhuang TJJ today for a quotation, technical drawing, or sample. We speak the language of US specifiers and can match your exact dimensions, load class, and timeline.
📞 Call / WhatsApp: +86-15511680668
✉️ Email: sindyhao2014@163.com
🌐 Contact page: www.tjjironcastings.com/contactus.html
“We treat each inquiry as a partnership – from initial size discussion to final load test report.”
