| L | = Compressed length of the helix |
| D2 | = Outside diameter of the helix |
| D1 | = Inside diameter of the helix |
| A | = Length of the straight first end |
| A3 | = Stripping length of the first end (jacket) |
| A2 | = Stripping length of the first end (insulation) |
| A1 | = Stripping length (complete) |
| B | = Length of the straight second end |
| B3 | = Stripping length of the second end (jacket) |
| B2 | = Stripping length of the second end (insulation) |
| B1 | = Stripping length (complete) |