Precision Shoulder Bolts

In the world of high-precision mold making and automation, you often need a component that acts as both a pivot shaft and a fastener. Our Precision Shoulder Bolts, also known as Stripper Bolts, are engineered for exactly this purpose. The unthreaded "shoulder" is ground to an incredibly tight tolerance-h7 or even h6 (down to ±0.005mm)-ensuring a perfect fit with linear bearings or bushings. Meanwhile, the threaded portion allows for secure mounting. For a φ10mm shoulder, we maintain a surface roughness of Ra≤0.8μm, providing a smooth, wear-resistant surface for rotating or sliding parts.

At our Shanghai factory, we have spent 20 years perfecting the "all-in-one" pivot. Our Stripper Bolt products are made from SCM435 alloy steel, heat-treated to 10.9 or 12.9 grade (Tensile strength ≥1200MPa). We use precision centerless grinding to ensure that the shoulder is perfectly concentric with the threads (within 0.05mm), which is critical for preventing jams in automated equipment. With a fatigue life of over 5 million cycles (ISO 3800), our bolts are built to handle the constant reciprocation of industrial stamping dies and robotic arms.