0.7mm Wire Diameter 304 Stainles Steel Compression Spring Pressure Small Spring

Measure the bore (inner diameter of the housing) your spring will sit in — the spring's outer diameter should be slightly smaller than the bore for a sliding fit, typically 0.2mm–0.5mm clearance. For free length, measure the uncompressed cavity depth and ensure the spring's free length is equal to or slightly longer than that distance so it exerts force when assembled. Select the variant whose Wire Dia × Outer Dia × Length matches those measurements.

With a 0.7mm wire diameter, these are light-duty compression springs suited for applications requiring gentle return force — such as button contacts, pen clips, small latches, and sensor actuators. They are not designed for heavy-load industrial applications. If you need higher spring rates, consider a larger wire diameter. Contact us if you need help estimating load capacity for a specific outer diameter and free length combination.

These springs are made from 304 stainless steel, which offers good resistance to oxidation and corrosion in most indoor and mildly humid environments. They are not recommended for prolonged immersion in saltwater or exposure to strong acids and chlorides without additional protective measures. For marine or highly corrosive environments, 316 stainless steel would be a more suitable choice.

Yes — the outer diameter values listed in the variant name (e.g., "0.7x6x20mm" means 0.7mm wire, 6mm OD, 20mm free length) correspond directly to the spring's outer coil diameter. Match this to your housing bore with a small clearance fit. The inner diameter of the spring (approximately OD minus 2× wire diameter, so roughly OD − 1.4mm) can also be used to seat the spring over a guide pin.

The variant is labeled as Wire Dia × Outer Dia × Free Length in millimeters. For example, "0.7x8x30mm" means: wire diameter = 0.7mm, outer diameter = 8mm, free (uncompressed) length = 30mm. The QTY option lets you choose how many springs you receive — 1, 3, or 10 per order.

If you are prototyping or need a single replacement spring, choose QTY = 1. For small project builds or to have spares on hand, QTY = 3 is a practical choice. If you are building in batches, running a production run, or want the best per-unit value, QTY = 10 is the most economical option. Note that pricing varies by size and quantity — check the variant selector for exact pricing.

Yes. The 0.7mm wire diameter and small outer diameter options (4mm–6mm) make these springs well-suited for use in keyboard switches, battery contacts, probe pins, and PCB-mounted spring plungers. The stainless steel material is non-magnetic (304 SS is austenitic) and provides adequate conductivity for low-current contact applications, though they are not optimized as electrical conductors.