MITSUBISHI MATERIALS CORPORATION
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BRA Drill
CUTTING RESISTANCE
Workpiece : DIN X5CrNi189 (220HB) Cutting Speed : 60m/min
Power Consumption Torque
Power Consumption Torque
Thrust
Thrust

Reason for Low Thrust Load
BRA Conventional Drill
IDENTIFICATION FOR BRA
IDENTIFICATION
Drill Type
Description Applications
 Products Name
Point Angle Hole Depth Helix Angle Relief Angle Back Taper Body Dia.
150° l/d=3–4 20° 10° 0.3mm/100mm øD1-0.2mm For General Use
(Carbon / Alloy / Stainless Steel)		 BRAS
Shank Size
Type Shank Diameter Drill Diameter
S16
 ø16(h6) ø8.0D1ø14.5
S20 ø20(h6) ø14.5D1ø18.5
S25 ø25(h6) ø18.5D1ø23.5
S32 ø32(h6) ø23.5D1ø30.5
S40 ø40(h6) ø30.5D1ø40.0
Honing Type
Type Honing Width(mm) Workpiece
BRA
-(Standard)
 0.15–0.2
 Carbon Steel, Alloy Steel, Mild Steel
S 0.2–0.25 –
M 0.25–0.3 –
L 0.3–0.4 –
H 0.05–0.1 Stainless Steel, Heat Resistant Alloy, Titanium Alloy
G 0.025–0.08 Cast Iron, Aluminum Alloy, Non-Ferrous Metals