In industrial production and daily life, die springs are ubiquitous. But have you noticed that these die springs often come in different colors? Spring coloration isn’t merely for aesthetics—it plays a critical role in practical applications, representing vital information such as the spring’s load rating. This directly impacts the normal operation and safety of equipment.

In industrial applications, the primary function of die spring colors is to indicate load ratings. Different colors correspond to distinct performance characteristics and suitable scenarios. Below is a detailed description of common spring colors:

Yellow Springs: Typically denote light load (SIMF) according to the Japanese Industrial Standard JIS B5012 and some Chinese reference standards. They feature relatively low stiffness and can bear smaller loads, but offer strong elastic deformation capacity. Suitable for applications requiring moderate elasticity but not high load capacity, such as switches in precision electronic devices and buffer components in small instruments. For instance, in mobile phone vibration motors, yellow springs provide suitable elastic support for the vibration module, ensuring stable vibration performance.

Blue Springs: Typically denote medium load capacity (SIML). They feature moderate stiffness with a balanced combination of elasticity and load-bearing capability. Commonly used in small mechanical devices and ejector pin reset mechanisms for certain molds. For instance, in small stamping dies, blue springs provide sufficient elastic force to rapidly reset ejector pins after stamping, ensuring proper mold operation.

 

Red Springs: Represent heavy load capacity (SIMM). Featuring high stiffness, they withstand substantial loads but exhibit less elastic deformation compared to yellow or blue springs. Applications include automotive seat adjustment mechanisms and industrial fixtures requiring high pressure resistance. During automotive seat adjustments, red springs deliver stable support to accommodate varying passenger preferences for seat height and angle.

 

Green Springs: Denote extra-heavy duty (SIMH). Featuring high stiffness and load-bearing capacity, they are primarily used in heavy machinery, mining equipment, and construction machinery where immense pressure and impact forces are encountered. For instance, in the shock absorption systems of large excavators, green springs effectively cushion the intense vibrations and impacts generated during digging operations, protecting critical equipment components.

 

Brown (brown, orange, etc.) springs: Also denote heavy-duty load capacity (SIMB), with naming varying across standards. Similar to green springs, they handle extreme loads and may be found in military equipment or specific components of large aerospace devices. In missile launchers, brown springs withstand instantaneous immense pressure to ensure smooth launch operations.

 

International spring manufacturing standards commonly include ISO 10243, JIS B5012, and American specifications such as the American Joint Standards and American ISO standards, as well as DIN ISO 10243. At present, China has not yet established a comprehensive spring color standard; typically, domestic standards draw on international norms or adhere to those set by renowned global brands.