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Hss twist drill bits Nitriding drill Black drill
Product description
Product Introduction
Feature
1.High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance.
2.Precision ground point, flutes, body, clearance and drill diameter for the ultimate in accuracy and performance.
3.Fully Ground surface finishing, High wear resistance: excellent processing performance with Smooth surface and tapping. Strict and good selection of materials.
4.Standard round handle,General round handle, widely used on electric hand drills, bench drills or drilling machines.
5.Clear material and diameter representations.
Drill points between normal 118°and 135° split point:
1. 118°point angles are used primarily in softer material such as mild steels and cast irons.
2. 135°split point should be used to cut harder steel materials and especially in deep holes over 4 times the drill diameter. With a 135°split point, cutting harder materials will produce thicker chips, minimizing work hardening of the cavity short.
The length of the lips on a 135°split point, measured from the axis to the cuter corners, is relativity short. This enables
quicker penetration into the workpiece and reduces thrust and abrasion along the cutting edges.
3. When repointing a standard 118°point to 135°，make a lip correction to reduce the hook of the cutting face.
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