The drill point length is the axial distance from the drill tip to the full diameter. It determines how deep you must drill past the required hole depth to achieve a full-diameter...
Let our engineers find the right factory for your specs. 100% Quality Guaranteed.
Request a Proposal →The drill point length is the axial distance from the drill tip to the full diameter. It determines how deep you must drill past the required hole depth to achieve a full-diameter hole bottom.
118° is the standard general-purpose point angle for drilling mild steel and cast iron. 135° is preferred for harder materials and is standard on most solid carbide drills. 140° is common for high-performance carbide drills in aerospace alloys.
The drill must feed past the nominal hole depth by the point length plus a small clearance to achieve a full-diameter hole. For a 10 mm drill with 118° point, add approximately 3 mm to the programmed depth.
No. A 135° point is shorter than a 118° point for the same diameter. If you switch without adjusting the depth, the hole bottom will be different. Always check the actual point geometry when changing drill brands.
Enter the drill diameter and point angle. The calculator gives the point length to add to your drilling depth and the approximate web thickness for reference. For through-holes, add point length + 2 mm clearance.
Continue with closely related tools from the machining calculator library.
Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.
Before you commit to a spec, it helps to know what the market pays for it. These are real, publicly listed factory prices — not a quotation, and not a guess.
We source the tool families below direct from vetted Chinese factories, matched to the material and tolerance you just worked out. Every batch ships with its material certificate and dimensional record.
Explore more precision machining tools and calculators
SETTING DRILL DEPTHS? Point length governs depth control, and it is one of the specs most often left off an inquiry. See the complete list of what to send a tool shop.
Point length decides where your drill actually starts cutting, which is why spot drills exist. Send the included angle, diameter and the material being drilled.