2-1/4-8 SPECIAL PITCH HAND BOTTOM TAP2-1/4-8 SPECIAL PITCH HAND BOTTOM TAP 5-750-1521, BRIGHT, HSS All our special taps are made of High Speed Steel, are a bright finish, and we normally stock a Plug Style, Bottoming Style may be available in some sizes. For drill sizes on taps most manufacturers recommend 70 to 75 percentage of thread. For standard fractional threads the MAGIC NUMBER IS .9742! FOR EXAMPLE let get a drill for a 1/4-20 tap; 1) Divide .9742 by the pitch, which in this case is 20 & you get .0487. 2) Subtract .0487 from major tap diameter, in this case .2500. 3) The answer is .2013. 4) Round up or down to nearest drill size, which is a #7 drill (.2010). The larger the drill, the less stress you have on the tap, and the less breakage! Don't see the tap you need? We can get any tap made within 24 to 48 hours, ask your salesman for details!
Tools & Instruments Taps Punches & Dies Irwin Hanson Cut Thread Taps - ST2-1/4-8-B - 2-1/4-8 SPECIAL PITCH HAND BOTTOM TAP
100% Satisfaction Guarantee: At Mansion Tools, we want to be sure that the item you choose is the right one for you. Within 30 days of delivery of your order, you may return any merchandise purchased from Mansion Tools in its original condition with your email order confirmation or packing slip. Restocking fees may apply. On items over $275 shipping within the US, we will even arrange free pick up or pay for returns shipping.