Cup Square Bolt M8x50 A2 SS 304 603

Cup square bolts, also known as carriage or coach bolts, are fasteners with a smooth, domed (cup) head and a square neck underneath. The square neck locks into timber, preventing rotation while tightening the nut. They are primarily used to connect timber-to-timber or timber-to-metal, offering a secure, flush, and snag-free finish.