1. Min ID of spring - 25mm 2. Max ID of spring - 300mm 3. Min and Max OD will depend on bar dia, which will be calculated - ID + 2 x bar dia = OD 4. In our brochure we have written bar dia range as 14mm to 40mm, but during manufacturing it will be 6mm to 40mm 5. Min rod length - 1500mm 6. Max rod length - 4800mm 7. Max free height of the spring without load - 1000mm 8. Max height with full load and spring load parameters will be calculated as per bar dia. The spring steel round bars which we procure is of the following two grades - 1. 60Si7 2. 52Cr4Mo2V Lot size will be in Tonnes or Per set