24"×24" Ductile Iron Drainage Grate & Frame
Hot-dip galvanized, bicycle-safe slot pattern
24"×24" ductile iron catch-basin grate and frame, hot-dip galvanized per ASTM A123. AASHTO H-20 traffic rated, bicycle-safe slot widths under 7/8", matched grate-and-frame set with no field fitting.
| Product Code | LZB-DG-S24-D400 |
|---|---|
| Clear Opening | ~22"×22" (560×560 mm) within 24"×24" frame |
| Overall Size | 24"×24" (610×610 mm) |
| Material | Ductile Iron QT500-7 (grate) + ductile iron or hot-rolled steel (frame) |
| U.S. Material Equivalent | ASTM A536 / ASTM A36 |
| Load Rating | AASHTO H-20 (16,000 lb wheel load) · C250 to D400 |
| Assembly Weight | 88–132 lb (40–60 kg) assembly |
| Surface Finish | Hot-dip galvanized per ASTM A123 |
| Application | Catch basin, curb inlet, alley drain, storm drainage |
- · ASTM A536 (grate material)
- · ASTM A123 (hot-dip galvanizing)
- · AASHTO H-20 (load)
Equivalent to SPPWC 311-4 catch-basin grate & frame — standard for catch basins across California municipalities. Also compatible with SPPWC 302, 303, 304, and 305 configurations.
Why specify this
- ✓ Hot-dip galvanized per ASTM A123 for storm-environment corrosion resistance
- ✓ Bicycle-safe slot orientation — slot width < 7/8" per SPPWC and ADA guidance
- ✓ Support beams available for structures requiring multiple grate panels
- ✓ Matched grate-and-frame set — no field fitting required
- ✓ Custom sizes available for non-standard catch-basin openings
The 24”×24” catch-basin grate is the most-specified storm-drainage grate across SoCal municipalities, with SPPWC 311-4 the typical reference. We ship hot-dip galvanized per ASTM A123 for corrosion durability in the wet storm-drain environment, and use a parallel-bar slot pattern that meets the bicycle-safe slot-width guidance (slots < 7/8”) referenced in many municipal cyclist-safety standards.
Frame-and-grate are supplied as a matched set so the install crew doesn’t have to file or shim in the field — drop in, set in mortar, done.
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