Determining Thread Length of a Hex Cap Screw or Bolt
The Nut and Bolt Solution Series
Need to know how to determine the amount of thread on a bolt? For a hex cap screw the rule of thumb is 2 times the diameter plus 1/2 inch. If you need a fully threaded bolt you should ask for a tap bolt.
Video 5: How to Determine the Thread Length of a Bolt
Our disclaimer: 24 years as a fastener distributor may make us knowledgeable and familiar with common fastener questions. It doesn't qualify us as technical experts. We will gladly refer you to the fastener industries "authorities" for your technical specifications. NFDA - The National Fasteners Distributors Association. IFI - Industrial Fasteners Institute. STAFDA - Specialty Tools and Fasteners Distributors Association