Thread Size: 1/4-20
Thread Length String: 2"
Thread Length String Decimal 2"
Fastener Thread Count (TPI): 20
Thread Coverage: Full Thread
Head Diameter String: 0.594"
Head Height: 0.135"
Material Type: Stainless Steel 18-8
Thread Type: Inch
Thread Style: Coarse
Thread Direction: Right Hand
Screw Head Style: Round Head Square Neck
A carriage bolt, coach bolt or round head square neck bolt is used through iron strengthening plates on either side of a wooden beam. It is commonplace though to use them on bare timber, the squared section giving enough grip to prevent rotation. Carriage bolts are extensively used in security fixings where the bolt must only be removable from one side. The smooth domed head and square neck below prevent the carriage bolt from being unlocked from the insecure side.
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