| Parameter Item | Nominal Value | Tolerance | Unit |
| Wire Diameter | 14.2 | ±0.15 | mm |
| Outer Diameter | 158.0 | ±1.5 | mm |
| Inner Diameter | 129.6 | ±1.5 | mm |
| Free Length | 345.0 | ±3.0 | mm |
| Total Coils | 6.8 | ±0.25 | Coils |
| Active Coils | 5.2 | ±0.25 | Coils |
| Direction | Right-hand | — | / |
| End Type | Closed & Ground Flat | — | / |
| Spring Rate | 248 | ±4% | N/mm |
| Hardness | 48–51 | ±2 | HRC |
OEM Part Number:55350-38800
Replaced by: 55350-38800-DS (Latest Revision)
Alternate OE: 55350-38801, 55350-38802
Product Name: Rear Suspension Coil Compression Spring
Application: Hyundai Sonata EF / Kia Optima MS 1998–2005
Position: Rear Axle, Left & Right Universal
Weight: 3.25 kg (7.17 lbs)
Material: 55CrSi / SUP9 High Strength Chromium Silicon Spring Steel
Quality Standard: ISO/TS16949, JIS G 4801
Recommended Replacement: Replace in pairs (LH+RH)
Warranty: 1 Year / 80,000 km
