Dormer A777 Hsco Heavy-duty Jobber Drill 1/4in
heavy-duty Cobalt jobber drill for use when greater heat isgenerated during drilling, e.g on higher tensile tougher materialsand in particular the Aerospace Industry.
Flute Geometry : Standard Helix, Right hand spiral, Thick Web
Point Angle :
0.30mm - 0.95 mm 118° Conical point
1.00mm to 1.40mm inclusive 135° 4 facet point
1.50mm and above 135° split point sizes (Split point geometryto NAS 907 Areospace Specification type P3 Point)
Surface Treatment : Bronze
Material : HSCo Cobalt steel
DIN 338 RN / BS328 / ISO235
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