Self-drilling bolt and nut assembly

摘要

A self-drilling bolt and nut assembly includes a nut which has a window to permit visual inspection of the fastener thread upon engagement with the nut. The nut also includes a protective cap or receives a protective cap so that upon threadably engaging the fastener with the nut, the drill tip of the fastener is automatically received in the cap. The nut also has at one end a plurality of projections to enhance the locking engagement. The self-drilling bolt may have an integral washer and employ a clamping plate engageable against the washer.

主权项

1. A self-drilling bolt and nut assembly comprising:
a fastener having a proximal end and a distal end and comprising a head at the proximal end including an integral washer and a shank extending from said head to a drill tip and having spaced threaded portions, said drill tip have a terminus at said distal end; a plate mounted to said shank and having an upper recess dimensioned to receive said washer and having a lower surface with a plurality of projections; and a nut having an exterior surface configured for applying or resisting a torque and an axially extending internal threaded surface threadably engageable with said fastener and having a first end defining an opening for inserting said fastener and an axially spaced opposite second end having a cap comprising an elongated portion and a closed end and entirely enclosing said drill tip and terminus, and defining a window between said first and second end and positioned at an intermediate axial position of said internal threaded surface, said first end having a plurality of projections.