Establishments primarily engaged in manufacturing leaf springs, hot wound springs, and coiled flat springs. Establishments primarily engaged in manufacturing wire springs are classified in Industry 3495.
- Automobile springs
- Coiled flat springs
- Flat springs, sheet or strip stock
- Helical springs, hot wound: for railroad equipment and vehicles
- Hot wound springs, except wire springs
- Leaf springs: automobile, locomotive, and other vehicle
- Railroad equipment springs
- Steel springs, except wire
- Torsion bar springs