1/4-20 Carriage Bolts and Nuts with Smooth, Domed Heads (12 Pack). The carriage bolts and nuts in this set are constructed of steel, and each come in a zinc-plated finish. The threading on these fasteners is 1/4 in.-20 teeth per in. (TPI),and they measure 1/4 in. diameter x 1-7/8 in. length. The carriage bolts feature a square section beneath their smooth,domed heads to help prevent spinning during tightening of bolts. These nuts and bolts are packaged for use with garage door hardware, but are useful with many other applications.
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