Carbon steel square nuts | Grade 8.8 high strength | Direct from the manufacturer

Carbon steel square nuts are fasteners with a square shape and a centrally threaded hole, hence their name. The products strictly adhere to the GB/T 39-1988 national standard (square nuts, grade C), with thread sizes ranging from M3 to M24. They can also be manufactured according to the DIN 557 German standard to meet the needs of different export markets.

The core structural feature of carbon steel square nuts lies in the organic combination of their square shape and the internally threaded hole. The square shape allows the nut to be embedded in the square hole of the workpiece or groove during installation, preventing rotation; the internally threaded hole engages with the bolt for a secure connection. The square shape also helps prevent loosening due to unforeseen circumstances.

Material and Performance: The products are manufactured using high-quality carbon steel (such as Q235, 35#, 45# steel, etc.). Performance grades cover 4, 5, 8, and 10, with grade 8.8 square nuts having a tensile strength of no less than 800MPa and a yield strength of no less than 640MPa, suitable for medium to heavy load conditions. Customization of higher strength grades such as 10.9 and 12.9 is also available.

Carbon steel square nuts are available in sizes from M3 to M24, with variations in width and height depending on the specification. As a professional manufacturer of carbon steel square nuts, we offer a complete range of specifications, and non-standard sizes can be customized. Inquiries are welcome to receive free samples and customized quotations.

Square Shape, Anti-Rotation and Locking

The square shape is the core structural advantage of carbon steel square nuts. After the nut is inserted into the square hole in the workpiece or slot, the square outline effectively prevents the nut from rotating during tightening. No tool is needed on the other side for fixation, enabling convenient one-sided operation and significantly improving assembly efficiency.

Anti-Rotation in Slots, Adaptable to T-Slots and Square Holes

Square nuts are particularly suitable for parts with T-slots and square holes. After being inserted into the slot, the nut can slide along the slot to adjust its position before being tightened with bolts, offering high flexibility. This feature makes it an ideal choice for embedded parts in construction, mechanical guides, and profile connections.

High Strength Grade, Excellent Load Capacity

Product performance grades cover 4, 5, 8, 10, and 12.9. Grade 8.8 square nuts and above are heat-treated for enhanced tensile and yield strength, suitable for high-load and high-vibration conditions. As a professional square nut supplier, we offer a full range of strength grades to meet different load-bearing requirements.

Standard Compatibility, Worry-Free Export
Our products strictly adhere to the national standard GB/T 39-1988 and can also be manufactured according to international standards such as DIN 557. As a professional square nut manufacturer, we support production according to multiple standards, including national and German standards, to meet the needs of different export markets.

Direct Factory Supply, High Cost-Performance Ratio
As a source manufacturer of carbon steel square nuts, we possess a complete industrial chain from raw materials to finished product delivery. Our direct supply model makes our square nuts more competitively priced, eliminating intermediary markups, ensuring full quality control, and offering better costs through bulk purchasing.