Specifications of Grade for PCB drill Blanks

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Class Grade Properties
Grain size Binder content TRS Hardness
HRA		 Hardness
Hv		 Fracture toughness Young's modules
(㎛) (wt%) (GPa) (GPa) (MPa・m1/2) (GPa)
Ultra micro grain AF209 0.2 9.0 4.0 93.5 20.4 5.5 610
AF308 0.3 8.0 3.8 93.6 19.4 6.0 610
AF310 0.3 10.0 4.1 93.0 18.1 7.3 590
Micro grain AF505 0.5 5.0 3.6 93.6 20.1 6.7 650
Fine grain AF806 0.8 6.0 3.5 93.0 17.6 7.5 640

Diameter

Grade Ultra Small Diameter
（～ Φ 0.15）		 Small Diameter
（Φ 0.15 ～ Φ 0.4）		 General Diameter
（Φ 0.4 ～）
AF209 ◎ ○
AF308 ◎ ○
AF310 ○ ◎ ○
AF505 ○ ◎
AF806 ○ ○

Applications Range

Grade Hardened Steel High speed machining Multi-layered boards Routing
AF209 ○
AF308 ○ ○
AF310 ○ ◎ ○
AF505 ◎ ○ ◎
AF806 ○ ◎