![]() ![]() I have had satisfactory service from Emuge, Vega, and OSG taps, bought with the above factors in mind. Threads Per Inch: Minor Diameter 75 Thread for Aluminum, Brass & Plastics: 50 Thread for Steel, Stainless & Iron Close Fit: Free Fit 1: 0.073 48: 0. This is actually advantageous if you are using a form tap. There is nothing wrong with using a reamer after the drill to size the hole. Most hobby projects aren't likely to push the limits of thread strength anyway. Their rake angles are optimised for the special conditions of different. This will obviously lessen the stress on the tap, so as long as you have acceptable thread height, you should be fine. The GSR colour ring machine taps are the specialists among the GSR machine taps. Inch Form Taps for Steel, Stainless steel, Grey cast iron malleable and spheroidal iron, Aluminium and other non-ferrous metal, Special super and titanium. Things like cutter geometry and coating(s) make all the difference.Ĭontrol over hole size becomes more critical as well, if you want to try staying on the high side of allowable tolerance. Factors beyond the base material come into play. But for stainless, even a good, standard quality HSS tap is not the best choice. ![]() The workpiece is hard Form taps are suitable only for soft and malleable metals such as soft steel, some stainless steels, aluminum, copper, brass, and lead. I think that most of us have grown past that stage anyway. Cutting large holes with a form tap requires twice or three times as much torque as with cut taps, which can take its toll when threading large internal surfaces. ![]() Usually that means a premium tool and a premium price to go with it. If you have much to do with stainless, it will pay off in the long run to buy tooling specific for it. ![]()
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