Yes — MIM 17-4PH (aged) and 316L can function as spring elements for limited-cycle snap-fit applications. Key design parameters: maximum strain 0.5-1.0% for 316L (will yield above this), 0.3-0.6% for 17-4PH aged (brittle above this). Use a cantilever beam snap fit with a taper (2-3°) on the mating surface and a 45° return angle for the latch face.
Snap fit design guide for MIM materials:
| Material | Max Strain | Max Stress | Max Deflection (10 mm beam) | Cycles to Fatigue |
|---|---|---|---|---|
| MIM 316L as-sintered | 0.8% | 170 MPa | 0.08 mm | 1000-5000 |
| MIM 17-4PH H900 | 0.4% | 480 MPa | 0.04 mm | 500-2000 |
| MIM 17-4PH H1025 | 0.6% | 520 MPa | 0.06 mm | 1000-3000 |
| Fit Type | Hole Diameter (mm) | Shaft Tolerance | Recommended Interference | MIM Tolerance Required |
|---|---|---|---|---|
| Light press fit | 5.00 | +0.02/+0.04 | 0.01-0.03 mm | ±0.05 mm |
| Medium press fit | 5.00 | +0.04/+0.06 | 0.03-0.05 mm | ±0.05 mm |
| Heavy press fit | 5.00 | +0.06/+0.10 | 0.05-0.08 mm | ±0.05 mm with coining |
- As-sintered surfaces may have Ra 2.0-3.2 µm — this increased friction means interference fits need 20-30% less interference than machined parts to achieve the same retention force
- Gate vestige on snap fit beams may interfere with assembly — locate gates on non-functional surfaces
- Draft angles on snap fit features reduce the effective cross-section at the root — compensate by increasing beam width at the root by 10-20%