M2 High Speed Steel Precision ground thread Class 2 ISO 2284/ BS949 Pt. 3 Parallel shank with square Straight Flute Right hand threading Full form with Taper, Second, or Bottoming lead for BS Pipe (Fastening) threads “G” series Usually supplied in bright ground finish Tap basic dimensions shown in mm May be used by hand or in machines to produce accurate threads in most materials
*IMPORTANT. Length of thread is indicative only and can vary between manufacturers within normal practice. It is not necessary to have a long thread length because of the thread length that is required to be made - in recent years shorter thread lengths are being recommended increasingly, especially when for machine operations. ISO2284 sets a maximum threaded length, but not a minimum.
Taps may be supplied with coatings such as TiN (Titanium nitride) to special order, the quantity ordered determining the unit price. Sets of Taps A set of three hand taps in this series will consist of taps with taper, second, and bottoming leads. They are full form, and so differ only in the length of the chamfered lead provided, so it may not always be necessary to use a full sequence of three taps to make the finished thread [compare this with serial form taps -shown here (in metric size) under DIN352. Whitworth serial form taps may be supplied, but only to special order].
