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When a project demands reliable spring force in a compact form, finding the right compression spring can be frustrating — wrong wire gauge, wrong free length, wrong outer diameter. These 1.2mm wire diameter compression springs are designed for makers, engineers, and DIY builders who need a consistent, measurable elastic component they can select by exact size and length.
Each spring is formed from 1.2mm wire with outer diameters ranging from 6mm to 15mm (approximately 0.24" to 0.59") and free lengths from 10mm to 120mm (approximately 0.39" to 4.72"). The coil body is manufactured from spring steel, offering a balance of tensile strength and elastic recovery. Sold in packs of 2, 5, or 10 pieces depending on the variant selected.
These compression springs suit a wide range of use cases: mechanical assemblies requiring return-force elements, DIY jigs and fixtures needing controlled preload, robotics and automation builds calling for compact 1.2mm wire compression springs, and hobby projects such as pen mechanisms, valve returns, or latch systems where a small-diameter coil spring is essential.
10 outer diameter options (6mm–15mm) combined with 18 free length options (10mm–120mm) give you precise control over spring geometry for your specific application.
Consistent 1.2mm wire gauge across all variants ensures predictable spring rate and elastic behavior — critical for repeatable mechanical designs.
Formed from spring steel wire for reliable elastic recovery and resistance to permanent set under normal operating loads.
Available in packs of 2, 5, or 10 pieces — order the quantity that matches your project needs without overstocking.
Select your exact outer diameter and free length combination from the variant dropdowns — no guesswork, no substitutions.
Suited for robotics, automation, DIY mechanical assemblies, hobby electronics, pen mechanisms, valve returns, and latch systems requiring compact coil springs.
| Wire Diameter | 1.2mm (0.047") |
|---|---|
| Outer Diameter Range | 6mm – 15mm (0.24" – 0.59") |
| Inner Diameter Range | 3.6mm – 12.6mm (approx.) |
| Free Length Range | 10mm – 120mm (0.39" – 4.72") |
| Material | Spring Steel |
| Spring Type | Compression (open coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 2 / 5 / 10 pcs (select variant) |
| Coil Direction | See variant options |
The outer diameter (OD) should be slightly smaller than the bore or housing it sits in, with enough clearance to compress freely without binding. The inner diameter (ID) should be larger than any shaft or guide pin it slides over. For this product, OD options range from 6mm to 15mm — check your assembly drawings or measure your existing spring before selecting.
The "ID" value shown in the variant name (e.g., "1.2 x 6mm (ID:3.6)") refers to the approximate inner diameter of the spring in millimeters. It is calculated as the outer diameter minus twice the wire diameter: OD − (2 × 1.2mm). This helps you verify shaft or guide pin clearance without additional calculation.
Free length is the uncompressed length of the spring at rest. It determines how much travel (deflection) the spring can provide before reaching solid height. Choose a free length that gives you adequate working stroke in your assembly — typically the free length should be noticeably longer than the compressed length required by your design.
Spring load capacity depends on wire diameter, outer diameter, free length, and number of active coils. With a 1.2mm wire diameter, these springs are suited for light-to-medium duty applications such as pen mechanisms, small latches, valve returns, and electronic assemblies. For heavy-duty industrial loads, a larger wire gauge would typically be required. Specific spring rate data is not confirmed for all variants — contact us to confirm if load specifications are critical.
These springs are made from spring steel, which offers good mechanical properties but has limited corrosion resistance in wet or chemically aggressive environments without a protective coating. For outdoor or humid applications, consider applying a light oil or protective spray after installation. If corrosion resistance is a primary requirement, contact us to confirm surface treatment options.
Yes. The consistent 1.2mm wire diameter and wide selection of outer diameters and lengths make these springs well-suited for robotics, CNC fixtures, and automation assemblies where repeatable spring force and compact geometry are needed. Select the OD and free length that match your mechanism's travel and load requirements.
Pack quantity options (2, 5, or 10 pcs) are available for select size and length combinations. Order 2 if you need spares for a single assembly, 5 for small batch projects or prototyping, and 10 for production runs or when you want a full stock of a commonly used size. Not all size/length combinations are available in every pack quantity — check the variant dropdown for available options.
