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When a project demands reliable spring force in a confined space, finding the right small compression spring can be frustrating. Hobbyists, electronics repair technicians, and mechanical engineers who work with miniature assemblies need springs that hold consistent load without deforming or corroding over time. These 0.7mm wire diameter compression springs are engineered for exactly those demanding, small-scale applications.
Each spring is formed from stainless steel wire with a 0.7mm diameter, available in outer diameters ranging from 4mm to 12mm (approximately 0.16 in to 0.47 in) and free lengths from 5mm to 100mm (approximately 0.20 in to 3.94 in). The coil body is tightly wound with consistent pitch, and both ends are closed and ground to provide flat, stable seating surfaces.
These compression springs suit a wide range of use cases: replacing worn return springs in small electronic switches and push-button mechanisms, providing preload tension in precision instrument assemblies, and acting as cushioning elements in miniature robotics or 3D printer extruder components. Their compact form factor and corrosion-resistant construction make them a reliable choice for long-term DIY builds and repair work.
Consistent 0.7mm wire cross-section delivers predictable spring rate and load capacity across all size variants, suitable for light-duty precision applications.
Outer diameters from 4mm to 12mm and free lengths from 5mm to 100mm give you the flexibility to match exact dimensional requirements without custom fabrication.
Stainless steel wire resists oxidation and surface corrosion, maintaining spring integrity in humid environments, light chemical exposure, and long-term storage conditions.
Both ends are closed and ground flat, ensuring stable, perpendicular seating against spring seats and reducing lateral deflection under load.
Available in packs of 5 or 10 pieces depending on the length selected, so you have spares on hand for prototyping, repair batches, or multi-unit builds.
Uniform coil spacing throughout the body ensures even load distribution and repeatable deflection behavior across all units in a pack.
| Wire Diameter | 0.7 mm |
|---|---|
| Outer Diameter (OD) | 4 mm – 12 mm (0.16 in – 0.47 in) |
| Free Length | 5 mm – 100 mm (0.20 in – 3.94 in) |
| End Type | Closed and Ground |
| Material | Stainless Steel |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Bright (natural stainless) |
| Pack Quantity | 5 pcs (lengths 60–100mm) / 10 pcs (lengths 5–50mm) |
| Coil Direction | Right-hand |
Measure the bore or housing inner diameter (ID) where the spring will sit. The spring's outer diameter should be slightly smaller than the bore ID to allow free movement without binding. For a shaft-guided spring, the spring's inner diameter (OD minus twice the wire diameter) should be slightly larger than the shaft OD. Select your outer diameter variant accordingly from the options above.
Free length is the uncompressed length of the spring. Choose a free length that is longer than your required working length so the spring remains under compression in its installed position. As a general rule, the spring should not be compressed more than 70–80% of its free length in normal operation to avoid coil bind and fatigue.
With a 0.7mm wire diameter, these are light-duty precision springs suited for applications requiring low to moderate spring forces — such as switch return mechanisms, instrument preloads, pen clickers, and small robotics. They are not intended for heavy industrial or high-load structural applications. If you need specific load or rate data for your variant, please contact us to confirm.
These springs are made from stainless steel, which provides good resistance to oxidation and mild corrosion in typical indoor and light outdoor environments. They are suitable for humid conditions and light chemical exposure. For highly corrosive environments (salt spray, strong acids/bases), additional protective measures may be needed.
Yes — the small OD range (4–12mm) and short-to-medium free lengths make these springs well-suited for 3D printer extruder assemblies, bed leveling mechanisms, PCB push-button switches, and similar maker projects. Match the OD and free length to your design's spring pocket dimensions for a proper fit.
Shorter springs (5–50mm free length) are sold in packs of 10 pieces, while longer springs (60–100mm free length) are sold in packs of 5 pieces. This reflects the typical usage pattern — shorter springs are more commonly used in multiples for small assemblies, while longer springs are often used individually or in pairs.
Stainless steel offers reasonable outdoor durability in most climates. For prolonged outdoor exposure in coastal or high-humidity environments, consider applying a light protective coating or selecting a spring with a larger wire diameter for added robustness. These 0.7mm wire springs are best suited for sheltered or indoor applications.
