According to JIS standards, a spring index of "4 or more and 22 or less" is desirable.
The material used is "spring stainless steel wire SUS304-WPB." The wire diameter is Φ0.4. An important index in the design and processing of springs is the spring index. The spring index is a value that serves as a guideline for the difficulty of processing a spring, calculated by dividing the average coil diameter by the wire diameter. A small spring index results in a tight and difficult winding, while a large spring index leads to a loose and unstable winding. According to JIS standards, a spring index of "4 or more and 22 or less" is considered desirable. This spring has an average coil diameter of 12mm and a wire diameter of 0.4mm, resulting in a spring index of 12mm ÷ 0.4mm = 30. This indicates a spring index that exceeds 22, making it a loose and unstable winding pattern; however, it seems to be wound quite neatly. If you have any concerns regarding springs, please feel free to consult us. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. for springs. We also support web meetings.
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Tsuruga Spring Co., Ltd. is a spring manufacturer located in Tsuruoka City, Yamagata Prefecture. We specialize in the design and manufacturing of coil springs, as well as wire forming processing. 1) Our strength lies in our ability to respond quickly from design to prototyping. Are you facing issues such as springs breaking, deforming, or being weak? Our technical staff will respond carefully, so please feel free to consult with us. It's okay even if you don't have drawings. 2) We can accommodate a wide range of wire thicknesses from 0.1mm to 10.0mm. We stock piano wire, stainless steel wire for springs, oil-tempered wire, and phosphor bronze wire. We can also handle special spring materials that are outside JIS standards, such as Herculite and SWIC. Additionally, we can accommodate wire diameters exceeding 10mm through outsourcing. 3) We accept orders from one piece to tens of thousands of pieces. Technical Contact: Ujiie Phone: 0235-22-0407 FAX: 0235-22-0546 Email: web@tohj.com Tsuruga Spring Co., Ltd. 〒997-0011 3-10-25 Takarada, Tsuruoka City, Yamagata Prefecture