304 Stainless Steel Compression Springs 150 Piece Set For Small Pens, Wire Diameters 0.3mm to 0.5mm, Outer Diameters 4mm to 6mm, Free Length 10mm to 30mm, Durable Reusable Coil Springs For DIY Projects And Gadgets

304 Stainless Steel Compression Spring Set for DIY Pens
✔️ 150pcs set: wire Ø0.3-0.5mm, OD 4-6mm, free length 10-30mm

These 304 stainless steel compression springs come in a 150-piece pack, designed for small pens and DIY gadgets. They deliver durable elasticity with rust resistance, making them ideal for pen mechanisms, mini gadgets, and lightweight mechanical projects.

✅ Wire diameters: 0.3mm, 0.4mm, 0.5mm (0.012 in, 0.016 in, 0.02 in)
✅ Outer diameters: 4mm, 5mm, 6mm (0.16 in, 0.20 in, 0.24 in)
✅ Free lengths: 10, 15, 20, 25, 30 mm (0.39, 0.59, 0.79, 0.99, 1.18 in)
✅ Durable, rust-resistant 304 stainless steel; reusable for long-life
✅ Pack size: 150 pieces in one set

💡 What is a handy use for small compression springs in DIY gadgets?
- Provide return force in pen mechanisms and small push-button devices
- Act as tiny tensioners or cushioning in compact assemblies
- Help maintain alignment and spacing in lightweight tools