Toolcraft 137074 spring pins, made from high-quality spring steel according to DIN 1481 standards, provide reliable fastening solutions for bicycle headsets. These robust dowel pins, with a diameter of 21 mm and a length of 55 mm, ensure precise dimensional accuracy for secure component alignment in bicycle applications. The spring steel construction guarantees excellent elasticity and fatigue resistance, maintaining constant clamping force under vibrations and dynamic loads while cycling. Each pack contains 25 pieces, sufficient for multiple installation or replacement needs. These pins are specifically designed for bicycle headset bearing systems, allowing for correct bearing preload and smooth rotational movement. The DIN 1481 specification ensures standardized dimensions and material properties, ensuring compatibility with industry-standard bicycle components. The spring steel material offers superior corrosion resistance compared to standard steel variants, extending the lifespan under outdoor cycling conditions. These pins are designed to withstand the mechanical stresses of regular cycling, including impacts from uneven terrain and continuous torque forces. The precise 21 mm diameter ensures a proper fit in standardized bicycle headsets, while the 55 mm length provides adequate insertion depth for secure fastening. The spring pin design allows for easy installation and removal during maintenance without compromising the integrity of the mating components. These components are essential for proper headset function, contributing to stable steering performance and overall bicycle safety. Their robust construction makes them suitable for various cycling disciplines, from recreational riding to demanding mountain biking applications.