Compression Spring Wire Dia 0.7mm Zinc Plating Pressure Springs OD 5mm-12mm

Measure the inner diameter of your bore or the outer diameter of your guide rod. For a bore-guided spring, the OD should be 0.5–1mm smaller than the bore ID to allow free movement. For a rod-guided spring, the spring ID (OD minus 2× wire diameter, approximately OD − 1.4mm) should be 0.5–1mm larger than the rod OD. Select the closest available OD from the 5, 6, 7, 9, 10, 11, or 12mm options.

Free length determines how much compression travel (stroke) is available before the spring reaches solid height. As a conservative rule, the working stroke should not exceed 70–80% of the difference between free length and solid height. If your assembly requires 20–30mm of travel, a 60mm or 70mm free-length spring is typically appropriate; longer strokes may require the 90mm or 100mm options.

Spring load capacity depends on wire diameter, OD, free length, and number of active coils. With a 0.7mm wire diameter, these springs are suited for light-duty applications — typically in the range of a few Newtons to tens of Newtons depending on the specific variant. For exact spring rate and load data, contact us with your selected OD and free length, and we can provide the specification sheet.

Yes. Zinc electroplating provides a sacrificial barrier that slows oxidation of the underlying carbon steel. These springs are suitable for indoor environments and applications with moderate humidity exposure. They are not recommended for continuous immersion in water, salt spray environments, or aggressive chemical exposure — for those conditions, stainless steel springs would be more appropriate.

Yes. The compact OD range (5–12mm) and consistent 0.7mm wire diameter make these springs well-suited for small robotic actuators, gripper return mechanisms, sensor preload assemblies, and lightweight automation fixtures. The closed and ground ends ensure stable seating on machined spring pockets or standard spring seats.

Each variant is a specific combination of outside diameter and free length. To obtain multiple combinations, simply add each desired variant to your cart separately. The quantity selector within each variant allows you to choose packs of 1, 3, 5, 10, 15, or 20 pieces, so you can tailor your order precisely to your project needs.

The current variant range covers ODs of 5, 6, 7, 9, 10, 11, and 12mm. An 8mm OD option is not included in this product listing. If you require an 8mm OD spring, please contact us — we may be able to source or recommend an alternative.