Solid Carbide Head Thread Mills
The steel shank series of TOSCO Thread Mills provides the feature of extended
overall length with no sacrifice of quality and strength found in our Solid
Carbide Thread Milling Cutters. Thru-shank coolant holes are added to this line
to provide coolant delivery at the cutting edge. The overall length can easily
be shortened to reduce overhang when required. Solid Carbide Head Thread Mills
are stocked uncoated. Coatings available upon request. As with all TOSCO tools
this series of thread milling cutters can be sharpened or refurbished as required.
Class of thread
A classification system exists for ease of manufacture and interchangeability of fabricated threaded items.
Most (but certainly not all) threaded items are made to a classification standard called the Unified Screw
Thread Standard Series. This system is analogous to the fits used with assembled parts.
Classes 1A, 2A, 3A apply to external threads; Classes 1B, 2B, 3B apply to internal threads.
Class 1 threads are loosely fitting threads intended for ease of assembly or use in a dirty environment.
Class 2 threads are the most common. They are designed to maximize strength considering typical machine shop capability and machine practice.
Class 3 threads are used for closer tolerances.
For more information see: http://en.wikipedia.org/wiki/Unified_Thread_Standard