Catharines, Niagara, Halifax, Oshawa, Victoria, Windsor, Saskatoon, Regina, Sherbrooke, St. Toronto, Mississauga, Scarborough, Laval, Montreal, Montréal, Vancouver, Ottawa, Gatineau, Calgary, Edmonton, Québec City, Winnipeg, Hamilton, Kitchener, Cambridge, Waterloo, London, St. Manitoba, MB, Saskatchewan, SK, Alberta, AB, British Columbia, BC, Northwest Territories, NT, Nunavut, NU, Yukon, YT Scotia, NS, New Brunswick, NB, Prince Edward Island, PEI, PE, Quebec, PQ, QC, Ontario, ON, Servicing the Canadian provinces and territories of Have to be slightly increased or decreased to obtain good thread Depending on the materialīeing tapped and the depth of the tapped hole, the hole size may The tap drill sizes shown for form taps are only a In many cases the hole diameter does not correspond to a numberedĭrill, so the closest millimeter drill should be selected. Minimum diameter should be used for soft and ductile materialsĪnd the maximum drill diameter for harder and more difficult materials. (*) as a function of the major diameter is provided in three groupsĪnd each group has a minimum and maximum for tap drill size. As the length of the hole increases, the percentage of That 75% thread be adopted only for soft materials and short threaded Because these small taps are fragile, it is recommended
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