To determine the thread length, let's first understand the details given for the fastener.
The fastener is specified as a 4" long 5/16-18UNC-2A fastener. This contains several pieces of information:
- The length of the fastener is 4 inches.
- The diameter of the fastener is 5/16 inches.
- The thread count is given by 18 threads per inch.
The thread length refers to the part of the fastener that contains the threads.
Fastener Length: 4 inches
Given that the fastener's overall length is 4 inches and it is completely threaded (which is typically the case for screws and small-diameter bolts), the full length of the fastener is threaded.
Thus, the thread length in this case would also be 4 inches.
Therefore, the thread length for a 4" long 5/16-18UNC-2A fastener is 4 inches.
