The values you provided represent standard metric dimensions for industrial oil seals (often called shaft or rotary seals). The universal formatting for these measurements is Inner Diameter (ID) x Outer Diameter (OD) x Thickness/Width (W)
Dimension Breakdown
The specific numbers in your list correspond to the following metric sizes:
- 30-40-10 (or 30-4010): 30mm ID x 40mm OD x 10mm Width
- 30-40.8: 30mm ID x 40mm OD x 8mm Width
- 32-40.8: 32mm ID x 40mm OD x 8mm Width
- 28-40.7: 28mm ID x 40mm OD x 7mm Width
- 35-40-10: 35mm ID x 40mm OD x 10mm Width
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