Square hole washers are flat washers featuring a centrally located square hole, specifically designed to fit square-headed bolts or carriage bolts. This design allows for a secure, non-rotating connection. These washers are commonly used in construction, woodworking, and heavy-duty applications to evenly distribute load and prevent bolt movement. The square hole design provides better alignment and grip, making them ideal for structural framing, fencing, and machinery where stability is essential.

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