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When your project demands a compact, reliable spring that fits into narrow housings without sacrificing consistent return force, a mismatched spring diameter or stiffness can cause binding, premature fatigue, or complete mechanism failure. Engineers, hobbyists, and repair technicians working on small-scale assemblies need a spring they can spec with confidence. These 0.7mm wire diameter compression springs are designed for exactly that — delivering repeatable elastic performance in a slender, lightweight form factor.
Each spring is formed from 0.7mm wire diameter steel, with outer diameters (OD) ranging from 4mm to 14mm (approximately 0.16" to 0.55") and free lengths spanning 5mm to 100mm (approximately 0.20" to 3.94"). The coil geometry provides a consistent pitch throughout the body, and the ground or closed ends (depending on variant) ensure stable seating on flat surfaces. Material is spring steel, typically with a natural or lightly treated finish suited for indoor and light-duty mechanical environments.
These compression springs are well-suited for electronics enclosures and battery contacts, pen mechanisms and retractable tools, small appliance return mechanisms, precision jigs and fixtures, and DIY robotics or automation projects requiring controlled linear force.
OD from 4mm to 14mm and lengths from 5mm to 100mm — one listing covers a broad spectrum of small-spring applications without sourcing from multiple suppliers.
Slender wire gauge delivers light-to-medium spring rates ideal for low-force return mechanisms, contact springs, and precision assemblies where space is limited.
Formed from spring steel wire for consistent elastic modulus, reliable cycle life, and resistance to permanent set under normal operating loads.
Shorter lengths ship in packs of 10; longer lengths (60mm+) ship in packs of 5 — sized to match typical project and prototyping quantities.
Closed coil ends provide a flat bearing surface for consistent load transfer and reduced lateral deflection when compressed against flat plates or shoulders.
From battery contacts and pen clips to robotics actuators and fixture clamps — these springs adapt to a wide range of light-duty compression tasks across electronics, tooling, and DIY builds.
| Wire Diameter | 0.7 mm |
|---|---|
| Outer Diameter (OD) | 4 mm – 14 mm (0.16" – 0.55") |
| Free Length | 5 mm – 100 mm (0.20" – 3.94") |
| Material | Spring Steel |
| Finish | See variant options |
| End Type | Closed ends (typical for this wire gauge) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 5 pcs (lengths ≥60mm) / 10 pcs (lengths ≤50mm) |
| Application | Light-duty compression, return mechanisms, contact springs |
Measure the bore or housing your spring will sit in — the spring OD should be slightly smaller than the bore ID to allow free movement without binding. For free length, select a spring that is longer than your required compressed length but shorter than your available travel space. Use the variant selector above to pick your OD (4mm–14mm) and length (5mm–100mm) combination.
These compression springs are formed from spring steel wire, which provides a reliable elastic modulus and good resistance to permanent set (taking a set) under repeated cycling within normal load ranges. They are suited for indoor and light-duty mechanical environments.
Spring steel offers moderate corrosion resistance suitable for dry indoor environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider stainless steel springs instead. If you need corrosion-resistant variants, contact us to confirm availability.
Spring rate varies by OD and free length combination. A shorter spring with a larger OD will generally be stiffer than a longer spring with a smaller OD at the same wire diameter. Exact spring rate values depend on the specific variant — contact us to confirm if you need precise force data for your design.
Yes. The 0.7mm wire diameter and small OD range (starting at 4mm) make these springs well-suited for battery contact springs, PCB-mounted spring contacts, and similar low-force electronic applications. Ensure the spring OD and length match your contact housing dimensions.
Shorter length variants (5mm–50mm free length) are supplied in packs of 10 pieces. Longer length variants (60mm–100mm free length) are supplied in packs of 5 pieces. Pack size is shown in the variant name (e.g., "30mm & 10" means 30mm free length, 10 pieces per pack).
For a guide rod fit: the spring inner diameter (ID) should be slightly larger than the rod OD. ID can be estimated as OD minus twice the wire diameter (ID ≈ OD − 2 × 0.7mm). For a bore fit: the spring OD should be slightly smaller than the bore ID. Always allow 0.1–0.3mm clearance on each side for smooth operation.
