304 stainless steel thin-head hexagon socket drive screw with limit shoulder, shaft shoulder, smooth shank, screw step bolt M6/M8

The core advantages of 304 stainless steel hexagon socket head cap screws (also known as shoulder screws or limit screws) are "precise positioning, shear resistance and wear resistance, corrosion resistance and rust prevention, as well as fastening stability",

1. The core structure for precise axial shoulder positioning and controlling assembly clearance is the smooth axial shoulder + threaded segment. The axial shoulder can achieve a diameter and length accuracy of ±0.01mm. After tightening, the axial shoulder will closely adhere to the surface of the workpiece, serving the functions of precise positioning, limiting, and support. It can strictly control the clearance of the fixed components (such as the opening and closing distance of mold guide pins and fixture pressing plates), avoiding positional deviation caused by thread loosening. Compared to ordinary hexagon socket screws, there is no need for additional positioning pins; a single set of fasteners can achieve the dual functions of "fixing + positioning".
2. The shaft shoulder is designed for shear resistance and load-bearing, suitable for high-load scenarios. With a large cross-section and high shear strength, the smooth shaft shoulder can directly withstand lateral shear forces and axial pressure. Meanwhile, the threaded section is only responsible for locking and does not bear the main load, effectively avoiding thread slipping or breaking due to excessive stress. This characteristic makes it suitable for scenarios where molds, fixtures, automation equipment, etc. need to frequently withstand impact, vibration, and shear forces, and its fastening stability far exceeds that of ordinary screws.
3. 304 stainless steel material, featuring a multi-scenario corrosion and rust resistance with an alloy ratio of 18% chromium + 8% nickel, forms a dense oxide film on the surface, which can withstand erosion from humid, mild acid-base, and salt spray (non-coastal high concentration) environments. It is resistant to rusting in long-term use in wet workshops, outdoor equipment, food machinery, and other scenarios; the material is non-magnetic, non-toxic, and odorless, and can be adapted to precision instruments sensitive to magnetism (such as testing equipment, electronic fixtures) and food contact tooling.

Shenzhen Huayuanxing Precision Hardware Co., Ltd. is a manufacturer specializing in the development, production, and sales of screw fasteners, with 20 years of industry experience. Huayuanxing screws are characterized by precision, miniaturization, and firmness. The company's existing factory covers an area of over 8,000 square meters, with a finished product warehouse of over 4,000 square meters and a stock inventory of over 3,000 tons. It has successively introduced more than 250 precision production equipment, including cold heading machines, thread rolling machines, and thread milling machines, capable of producing small screws with an outer diameter of 1mm and a length of 3mm, with an average daily production capacity of up to 20 million pieces. Huayuanxing has complete inspection equipment, including salt spray testing machines and 2D imaging detectors. It currently employs more than 50 people, including 8 engineering and technical personnel with 20 years of industry experience