Bolt Depot
Email: info@boltdepot.com
Toll Free: 1-866-337-9888
HomeAbout UsProduct CatalogCustomer ServiceFastener Information
 
McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

Shopping is safe at Bolt Depot. [more]


Bolt Depot, Inc. BBB Business Review
PayPal  VISA  Master Card
American Express  Discover
UPS

Thread Pitch and Thread Count (TPI)

Thread Count (TPI)

TPI stands for Threads Per Inch. This is simply a count of the number of threads per inch measured along the length of a fastener. TPI is used only with American fasteners. Metric Fasteners use a thread Pitch (see below). In general smaller fasteners have finer threads, so the thread count is higher. For a table of standard US thread counts please see our US Threads Per Inch Table.

Threads Per Inch

Thread Pitch

Metric fasteners are specified with a thread pitch instead of a thread count. The thread pitch is the distance between threads expressed in millimeters (measured along the length of the fastener). For example a thread pitch of 1.5 means that the distance between one thread and the next is 1.5mm. In general smaller fasteners have finer thread so they have lower thread pitch. For a table of standard metric thread pitchs please see our Metric Thead Pitch Table.

Thread Pitch

Measuring Thread Count and Thread Pitch

Thread count or pitch is normally measured using a Thread Gauge. You can use our printable PDF thread gauge or you can buy a thread gauge. If you will be measuring fasteners frequently, it is recommended that you purchase one of our inexpensive thread gauges, which are significantly easier to use.

 

Copyright © 2000-2014 Bolt Depot, Inc.
www.boltdepot.com • info@boltdepot.com • Toll free: 1-866-337-9888