What Are the Standard Cross-Section Sizes for Ejector Blades?
Key Takeaway: Standard ejector blades are available in 40+ cross-section sizes from 1.2×0.6mm to 16×8mm. The width:thickness ratio follows approximately 2:1. Both metric (JIS) and imperial (DIN/ANSI) sizes are available.
Metric Standard Sizes (JIS B 4031)
| Width (mm) | Thickness (mm) | Aspect Ratio | Min Length | Max Length |
|---|---|---|---|---|
| 1.2 | 0.6 | 2.0:1 | 40mm | 100mm |
| 2.0 | 1.0 | 2.0:1 | 40mm | 150mm |
| 3.0 | 1.5 | 2.0:1 | 40mm | 200mm |
| 4.0 | 2.0 | 2.0:1 | 40mm | 250mm |
| 6.0 | 3.0 | 2.0:1 | 50mm | 300mm |
| 8.0 | 4.0 | 2.0:1 | 50mm | 300mm |
| 10.0 | 5.0 | 2.0:1 | 50mm | 300mm |
| 12.0 | 6.0 | 2.0:1 | 60mm | 300mm |
| 16.0 | 8.0 | 2.0:1 | 60mm | 300mm |
Cross-Section Sizing Rule
Blade width = rib width − 0.2mm (clearance for thermal expansion). Blade thickness ≥ rib width ÷ 4 (buckling resistance per ASME column design standards). Maximum unsupported length: L/T ≤ 30, where T = blade thickness. Example: 2mm thick blade → max unsupported length = 60mm.