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Square Head Bolts
This product features a square head and screw structure, cold-forged. The square head facilitates wrench gripping, ensures even force distribution, and the precise thread provides a secure connection. Coarse/fine threads are available, suitable for heavy-duty load connections. The full range covers mainstream systems, with readily available stock. Various rust-proof surface treatments are offered. Quality control is ensured, and environmental regulations are met. Compliance documentation is available. Non-standard customization is supported, suitable for heavy-duty connection scenarios.
- Executive Standard
- Specification Range
- Grade & Strength
- Common Materials
- Surface Treatment
- Surface Treatment
- Industry Classification
GB/T 8; ISO 898-1; DIN 897; ANSI/ASME B18.2.1
Metric: Thread M3~M64, length 10mm~500mm, square head width 4mm~30mm, thickness 3mm~25mm (coarse/fine); Imperial: Thread #6-32~2"-12, length 3/8"~20", square head width 3/16"~1-1/4".
Carbon steel grades 4.8, 6.8, and 8.8; stainless steel grades A2-50, A2-70, A4-70, and A4-80; non-ferrous metals grade not lower than 4.8.
High-quality low-carbon steel, medium-carbon steel, alloy steel, 304 stainless steel, 316 stainless steel, brass, aluminum alloy, etc.
Environmentally friendly blue-white zinc, colored zinc, black zinc, environmentally friendly nickel plating, zinc-nickel alloy plating, Dacromet coating, electrophoresis, PVD, stainless steel natural color, stainless steel passivation, etc.
Suitable for heavy machinery, steel structures, agricultural equipment, outdoor facilities, etc., and for connection scenarios that require manual or wrench tightening and high torque. The square head distributes force evenly and is easy to disassemble.
Do you need non-standard fasteners, precision metal parts, or custom structural components for a specific application?
Yongji helps you develop and manufacture special parts and custom products based on your drawings, samples, technical requirements, and target application scenarios.
Whether you need prototype quantities, pilot production, or stable mass supply, we provide an integrated solution from engineering review to production and delivery.
From fasteners to structural parts, Yongji offers integrated development and manufacturing for a wide range of custom precision hardware products.
Whether you need a few pieces for validation, small batches for development, or large volumes for mass production, we can support your project at different stages.
With integrated manufacturing resources in China and Vietnam, Yongji helps customers achieve stable quality, scalable production, and reliable delivery.
Yongji Precision Hardware is a global manufacturer specializing in precision fasteners and metal structural components. We are China Square Head Bolts Suppliers and Wholesale Square Head BoltsExporter && Company. Founded in 2003, the company has over two decades of experience serving international OEM and ODM customers across multiple industries.
With integrated manufacturing capabilities including cold heading, stamping, CNC machining and sheet metal fabrication...
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