O RING---7*2,8*2,6*2,5*6,7*1,6*1.5,5*1.5,3.5*2,3*2,10*2,12*2,

Here is a clear breakdown of the metric O-ring dimensions you listed. In standard metric sizing, these numbers represent the Inner Diameter (ID) × Cross-Section / Thickness (CS) in millimeters. To calculate the Outside Diameter (OD) for any size, use the standard engineering formula: \(\text{OD} = \text{ID} + (2 \times \text{CS})\). Breakdown of Your O-Ring Sizes3 × 2 — 3.0 mm ID | 2.0 mm CS | 7.0 mm OD3.5 × 2 — 3.5 mm ID | 2.0 mm CS | 7.5 mm OD5 × 1.5 — 5.0 mm ID | 1.5 mm CS | 8.0 mm OD5 × 6 — 5.0 mm ID | 6.0 mm CS | 17.0 mm OD6 × 1.5 — 6.0 mm ID | 1.5 mm CS | 9.0 mm OD6 × 2 — 6.0 mm ID | 2.0 mm CS | 10.0 mm OD7 × 1 — 7.0 mm ID | 1.0 mm CS | 9.0 mm OD7 × 2.8 — 7.0 mm ID | 2.8 mm CS | 12.6 mm OD8 × 2 — 8.0 mm ID | 2.0 mm CS | 12.0 mm OD10 × 2 — 10.0 mm ID | 2.0 mm CS | 14.0 mm OD12 × 2 — 12.0 mm ID | 2.0 mm CS | 16.0 mm OD