Общий каталог FANAR 2021 - страница 299

D4 D1 K K D3 D2 K m i Technical information 5. FORMING TAPS 5.1. Forming tap construction elements A r a L5 L3 L4 L2 L1 60° A A-A P r L1- total length L2 - thread length L3 - useful length D5 L4 - length of driving square L5 - chamfer length D1 - thread diameter r - straight flute D2 - shank diameter κ - chamfer angle D3 - neck diameter α - angle of thread D4 - (chamfer) point diameter P - pitch of thread m - width of land D5 - web (core) diameter a - size of square 5.2. Types of forming tap chamfers Chamfer length presented in Symbol Sketch Anglethe quantity of the thread coils 2÷3 P C 2÷3P 8,5° 1,5÷2 P E 1,5 ÷ 2 P 11,5° 12 296