65 Manganese Steel Compression Spring Wire Dia:1-1.8mm OD:6mm-28mm Length: 305mm

Start with the bore or housing inner diameter your spring must fit inside — the spring's outer diameter should be 0.5 mm to 2 mm smaller than the bore for clearance. Then select a wire diameter based on the load you need: thicker wire (e.g., 1.8 mm) produces a stiffer spring with higher load capacity, while thinner wire (e.g., 1.0 mm) gives a softer, lower-force spring. If you are unsure, order a single piece of two or three candidate sizes to test before committing to a larger pack.

65Mn is a carbon-manganese spring steel alloy with a carbon content of approximately 0.62–0.70% and manganese content of 0.90–1.20%. It offers a tensile strength typically in the range of 980–1180 MPa after heat treatment, making it well-suited for medium-duty compression spring applications. It provides good elastic recovery and fatigue life under repeated cycling, though it is not stainless and may surface-rust in humid or wet environments without protective coating.

65Mn spring steel is a carbon-manganese alloy and is not inherently corrosion-resistant like stainless steel. For outdoor or humid environments, we recommend applying a light coat of machine oil, grease, or a corrosion-inhibiting spray after installation. For fully corrosive or submerged environments, consider stainless steel springs instead. These springs are best suited for indoor mechanical assemblies, enclosed fixtures, and dry workshop applications.

Yes. The 305 mm free length is intentionally generous so these springs can serve as cut-to-length stock. Use an angle grinder with a thin cut-off disc or a spring-cutting tool to trim to your required working length. After cutting, lightly grind the cut end flat to ensure even seating. Note that cutting changes the spring rate and load characteristics — the shorter the spring, the fewer active coils and the stiffer the effective rate per unit of deflection.

If you are prototyping or need a single replacement, the 1 Pcs option lets you test fit and function before committing. For small production runs or workshop stock, 5 or 10 Pcs offers a good balance of cost per unit and quantity. The 20 and 30 Pcs packs provide the lowest per-unit cost and are ideal if you are building multiple assemblies or want to keep spares on hand. All pack sizes ship the same spring — only the quantity differs.

Measure three key dimensions of your existing spring or housing: (1) the outer diameter of the spring or inner diameter of the bore it sits in, (2) the wire diameter of the original spring, and (3) the free length and compressed length required by your mechanism. Match these to the variant options above. If your mechanism requires a specific spring rate or load value, contact us with your application details and we can help identify the closest match from our range.

Yes, several sizes in this range are commonly used in 3D printer Z-axis assemblies and heated bed spring mounts. For bed-leveling springs, look for outer diameters in the 6–10 mm range with wire diameters of 1.0–1.2 mm, which provide a soft, consistent preload. For Z-axis lead screw anti-backlash applications, stiffer variants with larger wire diameters may be more appropriate. Always verify the compressed length fits within your printer's spring pocket depth.