Cold Drawn Hexagonal Bar, Cold Drawn Steel Raw Material for Mechanical Fastener Components

      In modern machinery manufacturing, hardware fastener processing and automated equipment production sectors, strict requirements are imposed on dimensional consistency, surface finish and structural stability of special-shaped metal profiles. Traditional hot-rolled hexagonal profiles feature rough surfaces and large dimensional deviations, which require extensive subsequent grinding, straightening and finishing processes, increasing material waste and processing time. Conventional profiles have loose internal grain structures and tend to deform and twist under load, making them unsuitable for precision component assembly and long-term loaded working conditions. To address material challenges in the production of fasteners and mechanical fittings, our factory specializes in the R&D and production of cold drawn steel and launches cold drawn hexagonal bars. Serving as core raw materials for machining various mechanical parts and fasteners, they are widely adopted in precision manufacturing across multiple industries.

      This cold drawn hexagonal bar is manufactured by room-temperature cold drawing forming process, using carbon structural steel and alloy steel as base materials. It goes through continuous procedures including pretreatment, precision drawing, straightening and fixed-length cutting. The cold drawing process reshapes the internal grain structure of steel and achieves compact internal microstructure, improving the overall rigidity and torsional resistance of the profile. It resists twisting and bending under load, suitable for loaded applications such as mechanical transmission and fixed connections. The formed hexagonal bar has a regular cross-section, uniform across-flat dimensions and stable straightness to meet basic requirements for precision assembly.

      The profile surface is free of scale, bumps and burrs with a smooth finish. It does not require complicated surface grinding and can be directly used for secondary machining operations such as turning, milling, drilling and tapping. This greatly reduces component processing steps and cuts material and labor costs for manufacturers. The cold forming process preserves the original mechanical properties of steel, endowing the profile with both hardness and toughness. It performs well in scenarios involving frequent assembly and repeated disassembly. Fasteners, connecting shafts and positioning parts made from this material are less prone to loosening and deformation, supporting regular equipment operation.

      A wide range of product options are available. Hexagonal bars of different materials and specifications, including standard and non-custom sizes, can be produced. The dimension, length and across-flat thickness of profiles can be adjusted according to customers’ machining requirements. The product is suitable for manufacturing various standard fasteners, non-standard connectors, equipment positioning shafts, mechanical pin shafts and hardware fittings. It can also be used as connecting pieces for automated equipment frames, auxiliary mold parts and transmission structural materials, covering machinery manufacturing, auto parts, hardware processing, automated equipment and other industries.

Compared with ordinary hot-rolled hexagonal steel, cold drawn hexagonal bars offer better assembly compatibility. Profiles produced in batches maintain consistent dimensions with uniform assembly clearances for mass production on assembly lines, boosting manufacturers’ processing efficiency. The profile boasts good fatigue resistance and maintains stable structure under long-term exposure to equipment vibration and mechanical loads. It slows component wear and reduces the frequency of part replacement, matching the rhythm of large-scale continuous industrial production.

Our factory is equipped with a full set of automated cold drawn steel production lines to realize integrated operations from raw material warehousing, profile cold drawing, precision straightening to fixed-length cutting, with full-process control over production procedures. Before delivery of each batch of cold drawn hexagonal bars, sampling dimensional inspection, visual screening and mechanical property verification are performed to detect profile distortion, dimensional deviation and surface defects, ensuring good usability of every batch of profiles. Standard sizes are kept in stock for quick response to bulk purchase orders. Non-standard custom orders are also accepted to meet material demands for customized component machining.

Drawing on years of experience in cold drawn steel production, our factory continuously optimizes cold drawing and straightening technologies to stabilize profile forming quality and improve product performance for diverse precision machining scenarios. Besides cold drawn hexagonal bars, we can also supply various special-shaped cold drawn steel including round bars, square bars and flat bars. We provide a full range of cold drawn steel raw materials for machinery processing, hardware manufacturing and equipment manufacturers to satisfy industrial material supply needs across multiple fields.