When to Use Two-Step vs Two Separate One-Step Ejector Pins
Key Takeaway: Use a single two-step pin when the part has three concentric diameters that must eject as one unit. Use two separate one-step pins when the three diameters are non-concentric or can be ejected independently.
Decision Matrix
| Criterion | Two-Step Pin | Two One-Step Pins |
|---|---|---|
| Part geometry | Three concentric diameters | Non-concentric or independent features |
| Bore channels required | 1 (through two plates) | 2 (separate channels) |
| Plate machining cost | Lower (one bore) | Higher (two bores + alignment) |
| Replacement cost | Higher (specialty pin, 1 series) | Lower (standard pins, 17 series) |
| Max length | 250mm | 400mm per pin |
| Alignment risk | None (single pin) | Moderate (two pins must align) |