Steel Square Plate Washer

The Steel Square Plate Washer is a type of flat fastening component with a square (or rectangular) shape and a circular hole in the center. It is designed with a square exterior and a circular inner hole. It is mainly used to cooperate with bolts, nuts or anchor bolts to evenly distribute the tightening force on a large area of the load-bearing surface; it disperses pressure, protects the contact surface, prevents sinking and deformation, and enhances the stability of the bolt connection. It is widely used in steel structures, construction, mechanical installation and engineering fixation projects.

Specification dimensions

The size and thickness of the Steel Square Plate Washer mainly depend on the applicable standards. Currently, we offer the DIN 436 standard, which is the most widely used one.Please refer to the following core size parameters.

Core advantage

The core advantages of the Steel Square Plate Washer are as follows, highlighting the fundamental differences between it and ordinary circular washers:

（1）Extremely large bearing area

The side length of the square is larger than the outer diameter of the ordinary circular retaining ring, which can significantly reduce the pressure on the surface of the connected components. It is particularly suitable for low-strength substrates such as wood, composite materials, soft metals, plastics, and lightweight concrete, preventing the bolt head or nut from sinking into the material under the preload and avoiding connection failure.

（2）Four-sided anti-loosening

The four straight sides of the square shape will naturally fit into the surface of the workpiece or generate friction resistance when tightened, effectively preventing the washer from rotating along with the nut.

（3）Thick and highly rigid

Ordinary flat washers are usually thin and are prone to deformation under extremely high preload. The thickness of Steel Square Plate Washer is generally 3 mm, 4.75 mm, 6 mm or even thicker, and they can withstand the clamping force of high-strength bolts without deforming.

（4）Multi-functional use of one item

Due to its flat surface and precisely controlled thickness, the Steel Square Plate Washer not only distributes the load but can also be directly used as an industrial washer, for fine height adjustment and filling gaps.