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When your mechanism demands consistent return force and long-term dimensional stability, undersized or wrong-material springs become a costly failure point. Engineers, makers, and DIY builders working on CNC machines, robotics, jigs, and automation fixtures need compression springs that hold their spec across thousands of cycles — these 1.8mm wire 304 stainless steel compression pressure springs are built for exactly that.
Each spring is wound from 1.8mm diameter 304 stainless steel wire, offering a corrosion-resistant, non-magnetic option for demanding environments. Outer diameters range from 18mm to 30mm (approximately 0.71" to 1.18"), with free lengths available from 15mm to 120mm (approximately 0.59" to 4.72"). Sold in packs of 1, 5, or 10 pieces depending on the variant selected.
Typical use cases include spring-loaded clamps and fixtures for CNC workholding, return mechanisms in 3D printer extruder assemblies, valve and plunger assemblies in fluid control systems, and compression buffers in robotics end-effectors. The consistent wire diameter and OD tolerance make these suitable for drop-in replacement in standard spring pockets.
Wound from 1.8mm 304 stainless steel wire for corrosion resistance in humid, wet, or mildly acidic environments — a reliable choice over carbon steel for exposed applications.
Ten outer diameter options from 18mm to 30mm (0.71"–1.18") let you match the exact pocket diameter of your design without custom tooling.
Seventeen length options from 15mm to 120mm (0.59"–4.72") cover a broad range of travel and preload requirements in a single product family.
Uniform wire diameter and coil pitch across the range ensure predictable spring rate behavior and repeatable performance across production batches.
Available in packs of 1, 5, or 10 pieces — order a single unit for prototyping or a 10-pack for production runs and spares inventory.
Suited for CNC fixtures, 3D printer mechanisms, robotics, valve assemblies, jigs, and general-purpose spring-loaded hardware across maker and industrial use cases.
| Wire Diameter | 1.8mm (0.071") |
|---|---|
| Material | 304 Stainless Steel |
| Outer Diameter (OD) | 18mm – 30mm (0.71" – 1.18") — See variant options |
| Inner Diameter (ID) | 14.4mm – 26.4mm — See variant options |
| Free Length | 15mm – 120mm (0.59" – 4.72") — See variant options |
| Spring Type | Compression (open ends) |
| Coil Direction | Right-hand wound (standard) |
| Surface Finish | Natural / Uncoated |
| Spring Rate | See variant options |
| Packaging | 1 / 5 / 10 pcs — See variant options |
Measure the spring pocket or bore diameter in your assembly — the spring OD should be 0.5–1mm smaller than the pocket for a free-sliding fit. For free length, select a spring that is longer than your required compressed length plus the desired travel (stroke). Use the ID column to verify the spring will clear any inner guide rod.
The ID is calculated as OD minus twice the wire diameter. For example, the 18mm OD spring has an ID of approximately 14.4mm, and the 30mm OD spring has an ID of approximately 26.4mm. Each variant listing includes the ID in parentheses for quick reference.
These springs are suitable for light-to-medium duty applications such as return mechanisms, preload fixtures, and spring-loaded clamps. For heavy load-bearing or safety-critical applications, please verify the spring rate and maximum load against your engineering requirements. Spring rate varies by OD and free length — contact us if you need specific load data.
304 stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemicals. It is suitable for humid environments, light outdoor exposure, and most indoor industrial settings. For marine or chloride-heavy environments, 316 stainless steel would be a more appropriate choice.
Yes. Use the ID value listed in the variant name to confirm clearance over any inner guide rod. The OD value confirms the spring will fit inside a tube or bore. Allow at least 0.3–0.5mm clearance on each side for smooth operation without binding.
Yes — these are commonly used in 3D printer extruder and bed-leveling assemblies, CNC workholding fixtures, and robotic end-effector return mechanisms. The 1.8mm wire diameter and stainless construction provide durability and consistent performance in repetitive-cycle applications.
Order a pack of 1 for prototyping or single-unit replacement. Choose a 5-pack for small production runs or to keep spares on hand. The 10-pack offers the best per-unit value for batch builds or production inventory. Select your preferred pack size in the "Packaging (pcs)" option above.
