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Dormer A10831/64 (MID 6305920) is a 31/64" (12.3mm) jobber length drill with 135° split point, steam tempered finish, and quick spiral flute geometry. Made from High Speed Steel (HSS) per DIN 338, it features a cylindrical shank, 101mm flute length, and 151mm overall length. Designed for stainless steel and high-temperature alloys.
MODEL 6305920
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ApplicationAngleIcon_DICT_SEL
Drill point 135°
Basic Standard
DIN 338
Coating
Steam Tempered
Connection (shank) description
Cylindrical shank
Connection diameter - inch (DCON MS)
0.4843
Connection diameter - millimeter (DCON MS)
12.3
Cutting diameter - fractional inch (DC)
31/64
Cutting diameter - inch (DC)
0.4844
Cutting diameter - millimeter (DC)
12.3
Cutting diameter tolerance class (TCDC)
h8
Drill Length
Jobber
EDP number
46305920
Hand (Cutting direction)
Right
Length chip flute - inch (LCF)
3.9764
Length chip flute - millimeter (LCF)
101
Material
HSS
Material application
M - Stainless steel, S - High-temperature alloys
MID number
6305920
Ordering code ANSI
A10831/64
Overall length - inch (OAL)
5.9449
Overall length - millimeter (OAL)
151
Point Angle (SIG)
135
Spiral form
Quick Spiral
Surface treatement
Steam Tempered
Usable length (ULDR)
4
The A108 drill from Dormer Pramet is sold in both fractional and metric diameters.
It is particularly suited for drilling stainless steels but can be used in many different machine and hand held applications.
It has a 135 degree split point which helps to self-center the drill and reduces the amount of force needed to drill the hole, whilst the steam oxide finish helps stop work piece material from sticking to the cutting edge of the drill.
The patented silver ring on the Dormer A108 drill on the larger sizes gives you confidence this is a genuine Dormer drill and also makes it very easy to find and read the drill size.
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