MITSUBISHI MATERIALS CORPORATION
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BRA

CUTTING RESISTANCE
Workpiece : DIN X5CrNi189 (200HB)  Cutting Speed : 60m/min
Power Consumption
Power Consumption
Thrust
Thrust
Torque
Torque

Reason for Low Thrust Load
BRA
Conventional Drill

IDENTIFICATION FOR BRA
IDENTIFICATION
1) Drill Type
Type Description Applications
Products Name
Point Angle Hole Depth Helix Angle Relief Angle Back Taper Body Dia.
BRA 150° l/d=3–4 20° 10° 0.3mm /100mm øD1-0.2mm For General Use
(Carbon / Alloy / Stainless Steel)
BRAimageimageimageimageSimageimage
2) Shank Size
Type Shank Diameter Drill Diameter
S16
ø16(h6) ø8.0D1ø14.5
S20 ø20(h6) ø14.5˂D1ø18.5
S25 ø25(h6) ø18.5˂D1ø23.5
S32 ø32(h6) ø23.5˂1ø30.5
S40 ø40(h6) ø30.5˂D1ø40.0
3) 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