Drill Part Number System
Field 1 Drill Type
G Gun drill
E? Gun reamer
F? Speedfeed
S? Speedbit
V? Ventec
P? Proten
X? Special
Field 2 Standard or Coated
M? Standard metric
C ? Coated metric
I? Standard imperial
K ? Coated imperial
Field 3-7 Diameter
Decimal point between fields 4 & 5, size to 3 decimal places
Fields 8 Contour (Gun drills only. All other drills are A)
A - C1? Standard
C - C2? Grey Cast Iron
D - C3? Gun boring
E - C4? Crankshafts, Aluminium > dia ? 4.0
X - Special
Fields 9-12 Length (No decimal point)
Gun Drills - Overall length
Speedfeed -?Flute length
Ventec?- Flute length
Speedbit?- Flute length
Fields 13&14 Driver Type (See separate list for driver codes)
ND? No driver
RT? Re-tip
RD? Reduction
RG? Re-grind
MO? Modification
Fields 15 Workpiece Material
A? Steel/Non ferrous/Cast Iron
H? Grey Cast Iron
T? Cast Iron (high phosphorus content)
M? Stainless Steel, High Si content aluminium
Field 16 Nose Grinds
A? NG6/NG8 Standard
B? NG4 Aluminium
E? NG13 Grey Cast Iron
F? NG73 Stack
G? NG80 Flat bottom
H? NG82 Inconel
J? NG83 Crankshaft
K? NG86 Wood
X? Special
