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When a standard-length spring just won't reach, engineers, makers, and repair technicians need a long compression spring they can trust. These Y-Type 304 stainless steel long compression springs are designed for applications where extended travel, consistent return force, and corrosion resistance are non-negotiable — whether you're building custom machinery, repairing industrial equipment, or prototyping a new mechanism.
Each spring is formed from 304-grade stainless steel wire, offering excellent resistance to rust, oxidation, and mild chemical exposure. Wire diameters range from 1 mm to 2 mm (0.039" to 0.079"), outer diameters from 6 mm to 30 mm (0.24" to 1.18"), and all variants share a uniform 305 mm (12.0") body length — giving you a long, consistent stroke in a compact coil form.
Typical use cases include long-travel return mechanisms in automation fixtures, tension-balancing assemblies in DIY robotics and 3D printer frames, valve and plunger return springs in fluid control systems, and replacement springs for industrial tools and jigs requiring extended compression range.
Made from 304-grade stainless steel wire for reliable corrosion resistance in humid, wet, and mildly corrosive environments — far outlasting carbon steel alternatives.
A uniform 305 mm (12.0") free length across all size variants gives you a long compression stroke, ideal for mechanisms that require extended travel or high deflection range.
Choose from wire diameters of 1 mm, 1.2 mm, 1.5 mm, and 2 mm paired with outer diameters from 6 mm to 30 mm, covering a broad range of bore and housing fits.
Uniform coil winding ensures a predictable, linear spring rate throughout the compression stroke — critical for repeatable force delivery in precision assemblies.
The Y-Type end configuration provides flat, stable seating surfaces that reduce lateral buckling and allow the spring to sit squarely in bores, housings, or against flat plates.
Available in 1, 2, 3, or 5-piece quantities per order — stock up for production runs or grab a single piece for a repair or prototype without over-ordering.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter Range | 1 mm – 2 mm (0.039" – 0.079") |
| Outer Diameter Range | 6 mm – 30 mm (0.24" – 1.18") |
| Free Length | 305 mm (12.0") |
| Spring Type | Compression (Y-Type) |
| End Type | Closed & Ground |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Order | 1 / 2 / 3 / 5 pcs (select above) |
| Size Designation | Wire Dia × Outer Dia × Length (mm) |
Match the outer diameter to your housing bore (the spring OD should be slightly smaller than the bore ID) and choose a wire diameter based on the load you need to support. Thicker wire (e.g., 2 mm) produces a stiffer spring with higher load capacity, while thinner wire (e.g., 1 mm) gives a softer, more compliant spring. If you're replacing an existing spring, measure the original's wire dia, OD, and free length directly.
These springs are suitable for light-to-medium duty applications such as return mechanisms, valve springs, jig components, and automation fixtures. The load capacity depends on the specific wire diameter and outer diameter combination selected. For heavy-duty structural or safety-critical load-bearing applications, consult a mechanical engineer and verify the spring rate against your load requirements.
304 stainless steel offers good resistance to atmospheric corrosion, fresh water, mild acids, and many organic chemicals. It is suitable for humid environments, light outdoor exposure, and food-adjacent applications. For highly saline environments (e.g., marine or coastal), consider 316 stainless steel instead, as 304 can be susceptible to chloride-induced pitting over time.
"Y-Type" refers to the end configuration of the spring. These springs have closed and ground ends, meaning the terminal coils are tightly wound and the end faces are ground flat. This provides a stable, perpendicular seating surface that minimizes lateral deflection (buckling) during compression and ensures the spring sits squarely against mating surfaces or inside bores.
Yes — these are a popular choice for DIY robotics, 3D printer bed leveling or Z-axis return mechanisms, custom jigs, and maker projects. The 305 mm free length gives you plenty of working stroke, and the stainless steel construction holds up well in workshop environments. Select the wire and outer diameter that fits your specific shaft or bore dimensions.
304 stainless steel springs maintain their spring rate well under normal operating conditions when not compressed beyond their elastic limit. Avoid compressing the spring to solid height (coil bind) repeatedly, as this can cause permanent set and reduce the effective free length over time. For best longevity, design your application so the spring operates within 70–80% of its maximum deflection range.
Order 1 piece if you need a single replacement or are prototyping. Order 2–3 pieces if you're building a small batch or want a spare on hand. Order 5 pieces for small production runs, multi-spring assemblies (e.g., four-corner bed leveling), or to reduce per-unit cost. Multi-piece orders are priced at a lower per-spring rate compared to single-piece orders.
