Compression Springs Wire Dia 0.8mm OD 9mm 304 Stainless Steel Vibration Damping

Measure the distance between your spring seats when the mechanism is at rest (free position). Select a free length that is longer than this distance by the amount of preload travel you need. For example, if your seat gap is 20 mm and you want 5 mm of preload, choose the 25 mm free-length variant. Always verify that the compressed (solid) length of the spring does not exceed your available compressed space.

With a 0.8 mm wire diameter and 9 mm OD, these are light-duty compression springs suited for applications requiring grams to low-Newton force ranges. Exact spring rate depends on the number of active coils, which varies by free length. For precise load calculations, use the spring rate formula: k = (G × d⁴) / (8 × D³ × Na), where G is the shear modulus of 304 SS (~69 GPa), d is wire diameter, D is mean coil diameter, and Na is the number of active coils.

304 stainless steel offers solid resistance to oxidation and mild corrosion in indoor and lightly humid environments. For prolonged outdoor exposure, salt spray, or aggressive chemical environments, 316 stainless steel would be a more suitable choice. These springs are well-suited for indoor electronics, 3D printers, CNC machines, and light automation equipment.

The inner diameter equals the outer diameter minus twice the wire diameter: ID = 9 mm − (2 × 0.8 mm) = 7.4 mm (approx. 0.291 in). This means any guide pin or shaft used inside the spring should be no larger than approximately 7.0–7.2 mm to allow free compression without binding.

Yes. The closed-coil geometry and consistent pitch of these 0.8 mm wire / 9 mm OD springs make them a practical choice for vibration-damping mounts on 3D-printer beds, hotend carriages, and light CNC router spindle mounts. Select a free length that provides 20–30% preload compression at your operating position for optimal damping performance.

For one-off prototypes or repair jobs, a 10–20 pc pack is usually sufficient. For small-batch production runs or ongoing maintenance stock, packs of 50–100 pcs offer better per-unit value. If you are building a larger product line or need a safety stock buffer, the 150–200 pc packs provide the lowest per-piece cost and reduce reorder frequency.

304 stainless steel is inherently free of lead, cadmium, and other restricted substances listed under RoHS directives, making these springs suitable for use in consumer electronics and PCB-mounted mechanisms. If your application requires formal RoHS documentation, please contact us to confirm before ordering.