High-Strength Expansion Bolt Assembly

Designed to meet high tensile and shear resistance requirements for heavy machinery installation and structural connections, this expansion bolt assembly achieves secure anchoring through the sleeve expansion principle. The black long rod serves as a配套 installation tool or specific specification screw, while the gold-colored components include a slotted expansion sleeve, conical nut, and hex head bolt. When assembled, they fit tightly against the substrate hole walls, effectively resisting loosening caused by vibration.

The manufacturing process utilizes multi-station cold heading for the head and precision turning for the shank, ensuring full thread profiles and strict concentricity. The depth and width of the expansion sleeve slots directly impact expansion performance, requiring strict control over cut burrs and uniform wall thickness. The angular tolerance of the conical nut determines friction distribution during locking, demanding high dimensional consistency.

Weide Auto Parts is equipped with double-stroke cold heading machines, CNC lathes, and precision high-speed thread rolling machines to ensure stable production of such high-strength fasteners. The factory offers comprehensive surface treatment capabilities, including black oxide, phosphating, and electro-galvanizing, to enhance corrosion resistance. Combined with Rockwell hardness testers, image measuring instruments, and torque testing equipment, we strictly verify core hardness, thread precision, and friction coefficients for each batch, meeting quality control standards under the IATF16949 system.

Purchasers can provide drawings based on specific application scenarios to specify material grades (such as carbon steel or alloy steel), surface treatment specifications, and mechanical performance indicators. The factory supports one-stop services from raw material selection to finished product inspection, particularly suitable for automotive modification, construction machinery, rail transit, and building reinforcement. Production schedules and packaging solutions can be flexibly adjusted according to order volume.