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When a project demands consistent return force in a compact form factor, undersized or mismatched springs cause premature failure, erratic movement, and costly rework. Engineers, makers, and repair technicians who need a precise, corrosion-resistant compression spring in the 1mm wire diameter range will find this range covers the most common outer diameters and free lengths in a single listing.
Each spring is formed from 304 stainless steel wire with a nominal diameter of 1mm (0.039 in). Outer diameters span 6mm–20mm (0.24 in–0.79 in) and free lengths range from 8mm to 100mm (0.31 in–3.94 in), with closed and ground ends for flat seating. The wire gauge and alloy combination delivers a balance of spring rate and corrosion resistance suited to moderate-load applications.
Typical use cases include electronic enclosure latches and button mechanisms, small appliance return springs, DIY robotics and actuator assemblies, precision instrument suspension, and light-duty valve or plunger return applications where a compact stainless compression spring is required.
Formed from 304-grade stainless steel wire for solid corrosion resistance in humid, wet, and mildly acidic environments — a reliable choice over plain carbon steel for exposed or outdoor assemblies.
Consistent 1mm (0.039 in) wire diameter throughout the range ensures predictable spring rate and deflection characteristics regardless of which outer diameter or length you select.
Outer diameters from 6mm to 20mm (0.24–0.79 in) and free lengths from 8mm to 100mm (0.31–3.94 in) cover a broad range of bore and guide-rod sizes in a single product listing.
Closed (and typically ground) end coils provide a flat bearing surface, reducing lateral buckling tendency and ensuring even load distribution against spring seats and plunger faces.
Shorter lengths (up to 50mm) are supplied in packs of 10 pieces; longer lengths (60–100mm) come in packs of 5 pieces — sized for prototyping, repair stock, or small-batch production runs.
Standard right-hand coil direction is compatible with the majority of spring-loaded mechanisms and requires no special orientation during assembly.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter | 1mm (0.039 in) |
| Outer Diameter (OD) | 6mm – 20mm (0.24 in – 0.79 in) — See variant options |
| Free Length | 8mm – 100mm (0.31 in – 3.94 in) — See variant options |
| End Type | Closed ends |
| Coil Direction | Right-hand |
| Finish | Natural stainless (uncoated) |
| Spring Rate | See variant options |
| Quantity per Pack | 10 pcs (lengths ≤50mm) / 5 pcs (lengths 60–100mm) |
| Application | Light-to-moderate load compression, return, and cushioning |
Measure the bore or guide rod your spring will seat in. 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 ID (OD minus 2× wire diameter, so OD minus 2mm for this range) should be 0.5–1mm larger than the rod diameter. Select the closest matching OD from the variant options above.
Spring rate and maximum load depend on the specific OD and free length combination. Smaller ODs and shorter free lengths generally produce stiffer springs with higher rates per unit deflection. For precise load calculations, use the spring rate value listed in the variant details or contact us with your deflection and load requirements.
Yes. 304 stainless steel offers solid resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chloride-rich environments (e.g., seawater or salt spray) — for those conditions, 316 stainless steel is a better choice. For most indoor, humid, or light outdoor applications, 304 performs reliably without surface treatment.
304 stainless steel is widely used in food-processing and light medical equipment due to its corrosion resistance and ease of cleaning. However, suitability depends on your specific regulatory requirements. Please verify compliance with applicable standards (e.g., FDA, EU food contact regulations) for your end application before use.
Variants with free lengths up to 50mm are supplied in packs of 10 pieces. Variants with free lengths of 60mm to 100mm are supplied in packs of 5 pieces. The pack size is shown in the "Length (mm) & Qty (pcs)" option selector above — for example, "60mm & 5pcs" means a free length of 60mm supplied as 5 springs.
Check three dimensions: (1) free length — must fit within your available travel space when uncompressed; (2) outer diameter — must clear the bore or housing; (3) inner diameter (OD − 2mm for this 1mm wire range) — must clear the guide rod if rod-guided. If you are unsure, contact us with your assembly drawing or key dimensions and we will help you select the correct variant.
304 stainless steel retains useful mechanical properties up to approximately 300°C (572°F) for intermittent exposure. For continuous elevated-temperature service above 200°C (392°F), consider high-temperature alloys. For most room-temperature to moderately warm applications (electronics, appliances, light machinery), these springs are well within their operating range.
