Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Engineers and makers who need consistent spring force in compact assemblies often struggle to find small-diameter compression springs that hold their rated load without corroding or fatiguing prematurely. These A2 stainless steel Y-type compression springs are designed for hobbyists, prototype builders, and small-batch manufacturers who demand dimensional accuracy and long service life in a miniature form factor.
Each spring is wound from 0.8 mm (0.031 in) wire diameter A2 (304) stainless steel. The outer diameter spans 6 mm to 8 mm (approximately 0.24 in to 0.31 in), and free lengths range from 10 mm to 305 mm (0.39 in to 12.0 in) across the available variants. The Y-type (open-coil) geometry provides a linear load-deflection curve suited to precision applications.
Typical use cases include 3D printer bed leveling mechanisms requiring repeatable spring-back force, electronic enclosure latches and push-button return assemblies, and light-load valve or actuator return springs in pneumatic or fluid-handling prototypes.
| Wire Diameter | 0.8 mm (0.031 in) |
|---|---|
| Outer Diameter (OD) | 6 mm / 7 mm / 8 mm (0.24 / 0.28 / 0.31 in) |
| Free Length | 10 mm – 305 mm (0.39 – 12.0 in) — See variant options |
| Material | A2 Stainless Steel (Grade 304) |
| Spring Type | Y-Type (Open-Coil Compression) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Pack Quantity | 1 / 2 / 5 / 10 / 20 / 50 pcs — See variant options |
| Weight (per pack) | See variant options |
Measure the inner diameter of your spring pocket or the outer diameter of your guide rod. For a pocket, the spring OD should be 0.2–0.5 mm smaller than the pocket ID to allow free movement. For a guide rod, the spring ID (OD minus twice the wire diameter) should be 0.2–0.5 mm larger than the rod OD. With 0.8 mm wire, the approximate IDs are: 6 mm OD → ~4.4 mm ID; 7 mm OD → ~5.4 mm ID; 8 mm OD → ~6.4 mm ID.
Free length is the uncompressed length of the spring. Choose a free length that is longer than your required working length by at least the deflection you need. For example, if you need 5 mm of travel at a specific load, select a spring whose free length minus your compressed length equals at least 5 mm. Always leave a small solid-height margin to avoid coil bind.
Spring rate depends on wire diameter, OD, and number of active coils (which varies with free length). With 0.8 mm wire and 6–8 mm OD, these springs are suited to light-duty loads typically in the range of a few tenths of a Newton to a few Newtons per millimeter of deflection. For precise load requirements, contact us to confirm the spring rate for your chosen variant before ordering.
A2 (Grade 304) stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for continuous immersion in chloride-rich environments (e.g., seawater or salt spray) where A4 (Grade 316) would be more appropriate. For indoor electronics, 3D printers, and light mechanical assemblies, A2 is an excellent choice.
Yes. The 6 mm OD variants are commonly used in 3D printer bed-leveling systems and extruder assemblies. The 7 mm and 8 mm OD variants suit slightly larger spring pockets found in some CNC fixtures and enclosure latches. Verify the free length and compressed length against your specific machine's spring pocket depth before ordering.
For prototyping or single-unit repairs, the 1- or 2-piece packs minimize cost and waste. For small production runs or when you need spares on hand, the 10- or 20-piece packs offer a lower per-unit cost. The 50-piece packs are best suited for batch manufacturing or stocking a workshop. Pricing scales with quantity, so larger packs provide better value per spring.
A2 stainless steel is compatible with many non-aggressive fluids including water, light oils, and air. For applications involving acids, strong alkalis, or chlorinated fluids, verify chemical compatibility before use. The open-coil Y-type geometry allows fluid to pass through the spring body, which is advantageous in valve return and check-valve applications.
