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The selection of an appropriate drill point angle for your bit should be informed by questions about your application. Yes, a hole is a hole is a hole, and while some angles are more common than others, there is no true standard drill point angle.
The 118 and 135 degrees drill bit angles are two of the most common cutting angles in drills. What is the difference? When would you use a 118° drill bit, and when should you opt for a 135° point angle?
An important factor when choosing the best drill bits for your project is Drill Bit Angle. The two most common Drill Bit Angles, or to be precise, Drill Bit Point Angles, are 118 degrees and 135 degrees.
Obviously the angles are different, a 118 degree bit has a sharper point which results in less walking and does not require a split tip like a 135 degree drill bit. 118 degrees makes a great hole and is considered by many to be a universal standard drill bit angle for the mass majority of your drilling needs.
Conventional. Conventional Drill Points are the most common tip style for general purpose drills, and usually have a tip angle of 118°. These drills are great for a range of material applications, including wood, non-ferrous metals, and mild steel.
The most common included angles for drills are 118° and 135°. These angles are an artifact from the time when drilling was largely a manual process, and the drill bits were conventional conical shapes.
DRILL BIT ANGLES EXPLAINED The 118° point angle is a smaller point angle and is ideal for drilling softer materials such as aluminum alloys. However, the 118° point may walk, requiring a center punch to spot drill the hole.
Helix angle is the rake angle of the cutting edge. The cutting resistance decreases as the helix angle increases. But if the helix angle is too high, the rigidity of the drill cutting edge decreases. Therefore, conventional drills have a helix angle of approximately 30°.
The two most common drill point styles are 135° split point and 118°. As you can see from the picture, the 135° has four cutting edges while the 118° has two. 135°split point drill bit (L) and 118° point. Which is best for your applications? 135° split point. Drills faster – 4 cutting edges.
angles will measure 9/16" per lip and the same drill with 118° included angles will measure 39/64" length per lip. Multiplied by both cutting edges, the 1" drill with 118° included angles is the equivalent of drilling with 3/32" larger diameter drill.