4Pcs 2mm Wire Diameter 304 Stainless Steel Compression Spring Pressure Springs

Measure the bore or housing inner diameter where the spring will seat. The spring's outer diameter should be slightly smaller than the bore — typically 0.5mm to 1mm of clearance — to allow free compression without binding. Select the outer diameter variant that fits within your housing while keeping the spring centered.

Determine the required compressed length (solid height) and the desired preload or working load. The free length should be long enough to provide the necessary travel (stroke) plus any preload compression. If you need the spring to exert force at a specific installed length, choose a free length that is longer than that installed length by the required deflection amount.

These springs are suitable for light-to-medium duty applications. The load capacity depends on the specific outer diameter and free length variant selected. For heavy industrial loads or high-cycle fatigue applications, verify the spring rate and maximum load against your engineering requirements. Contact us to confirm specifications for critical applications.

304 stainless steel offers good resistance to oxidation, moisture, and many mild chemicals. It performs well in indoor environments, light outdoor exposure, and humid conditions. For highly corrosive environments involving chlorides (such as saltwater or marine applications), consider 316 stainless steel instead. These springs do not require additional surface coating.

Yes. The closed-end design allows the spring to seat flat on standard spring seats and retainers. Ensure the seat diameter is sized to support the outer coil without the spring tipping. The inner diameter (outer diameter minus 2× wire diameter) should also be checked against any guide rod or pin used to center the spring.

304 stainless steel provides reasonable weather resistance for outdoor use in most climates. Prolonged exposure to standing water, salt spray, or acidic conditions may eventually cause surface discoloration or minor pitting. For extended outdoor or marine use, 316 stainless steel springs are recommended. For typical DIY and workshop outdoor applications, these springs perform reliably.

All variants share the same 2mm wire diameter and 304 stainless steel material. The outer diameter determines the spring's overall size and the bore it fits into, while the free length determines the available stroke and the force it exerts at a given compression. Choose the combination that matches your housing geometry and load requirements.