Explore Duratomic Product Range YOUR BENEFITS:The new range covers a variety of stainless steel alloys and applications, from finishing to heavy roughingThe TM1501 provides high productivity and wear resistance on medium to large-sized austenitic stainless steel components under stable conditionsTM2501 is the first choice in austenitic stainless steel alloy, providing long, predictable tool life and toughness for a variety of component sizes and conditionsTM3501 peaks in a variety of component sizes and in difficult alloys stretching from duplex to complex, high-alloyed super-duplex stainless steelYOUR CHALLENGES:Inconsistent turning performance in stainless steelsVarying machining and part conditionsInserts discarded before completely usedUnused edges increase tooling costPoor chip formation in sticky stainless steelsTool breakageOUR SOLUTIONS:High-performing, reliable grades and chip breakers for a wide range of applicationsDuratomic® advanced used-edge detectionA wider range of efficient chip breakers and tough grades for precise chip control and greater process consistency

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Using 20 thread-per-inch thread as an example, the screw must turn 20 revolutions to advance 1” in the part. A 1/4-20 double-start thread has the same number of threads per inch, but with two starting points, 180° apart, needs just ten revolutions to advance 1”. A triple-start thread, with starts 120° apart, will advance 3 times faster than a single lead thread. The result continues to change appropriately as additional starts are added. Original Posting: 3/20/2012 Last Revision: 10/19/2017 Error corrections in, or comments about, the above data can be sent to: office@gagecrib.com

Original Posting: 3/20/2012 Last Revision: 10/19/2017 Error corrections in, or comments about, the above data can be sent to: office@gagecrib.com

Additional Discussion: Single-start threads are most common, and are more useful for general fastening needs. They offer more resistance to loosening than multi-start threads, due to the lower helix angle of the thread. Multi-start, aka: multiple-lead, is a thread that offers quick assembly and disassembly.

Multiple start thread: a screw thread with two or more threads where the pitch is equal to the thread lead divided by the number of thread starts.  Also called multiple lead thread.

Thread lead can be described as the linear screw travel accomplished in one revolution. Thread pitch is the distance from any point on a screw thread to the corresponding point on the next thread, measured parallel to the axis. With a single-start thread, lead and pitch are equal. A double-start thread's lead is twice the pitch measurement.