Thread pitch, a critical parameter in fastener technology, describes the distance between adjacent threads on a screw or bolt. This measurement is typically expressed in millimeters (mm) for metric threads or as threads per inch (TPI) for Unified National and other imperial thread standards. Accurately determining this value is essential for proper component selection and assembly. For example, a bolt with a pitch of 1.5mm will advance 1.5mm for each full rotation of the bolt.
Understanding the spacing between threads is paramount for ensuring compatibility between mating components, preventing cross-threading, and achieving the desired clamping force. Historically, inconsistencies in thread specifications led to significant problems in manufacturing and engineering. The standardization of thread forms and measurement techniques has greatly improved efficiency and reliability across various industries.