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Dormer Pramet A7778.1 (MID 5971287) jobber length drill bit, 8.1mm diameter, 117mm overall length, 75mm flute length, cylindrical shank. Cobalt High Speed Steel (HSS-E) with bronze coating and steam tempered surface, 135° point angle, standard spiral flute geometry, split point. Conforms to DIN 338. Suitable for steel, cast iron, and high-temperature alloys.
MODEL 5971287
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$13.48 Each
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Drill point 135°
Basic Standard
DIN 338
Coating
Bronze
Connection (shank) description
Cylindrical shank
Connection diameter - millimeter (DCON MS)
8.1
Cutting diameter - inch (DC)
0.3189
Cutting diameter - millimeter (DC)
8.1
Cutting diameter tolerance class (TCDC)
h8
Drill Length
Jobber
EDP number
375556
Hand (Cutting direction)
Right
Length chip flute - inch (LCF)
2.9528
Length chip flute - millimeter (LCF)
75
Material
HSS-E
Material application
K - Cast iron, P - Steel and cast steel, S - High-temperature alloys
MID number
5971287
Ordering code ANSI
A7778.1
Overall length - inch (OAL)
4.6063
Overall length - millimeter (OAL)
117
Point Angle (SIG)
135
Spiral form
Standard Spiral
Surface treatement
Steam Tempered
Usable length (ULDR)
4
Recommended for use in difficult materials and applications, the A777 drill from Dormer 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 bronze oxide finish helps stop work piece material from sticking to the cutting edge of the drill.
The A777 is made from premium high speed cobalt material which means it can be used for drilling hard materials, including tool steels.
Producing more accurate sized holes with a better finish, the A777 drill really is a great performer.
*Note: 4 Facet Point up to 1.4mm
