The Solid Carbide Spot Drill delivers exceptional centering accuracy and chamfering efficiency for steels up to HRC55. Engineered for rigid CNC setups, this solid carbide spot drill eliminates tool deflection. Durable Mills manufactures high-durability carbide spot drills for precision B2B machining.
Engineered for high-rigidity CNC machining, the Solid Carbide Spot Drill from Durable Mills provides superior hole-starting precision and edge chamfering in a single operation. Made from premium micro-grain tungsten carbide, this versatile 90 degree spotting drill prevents secondary drill wandering, improves drilling concentricity, and extends overall tool assembly life in demanding metalworking environments.
| Model Type | Cutting Dia. (D) mm | Flute Length (Lc) mm | Shank Dia. (d) mm | Overall Length (L) mm | Point Angle |
|---|---|---|---|---|---|
| DM-3*8*3*50*90° | 3 | 8 | 3 | 50 | 90° |
| DM-3*8*3*75*90° | 3 | 8 | 3 | 75 | 90° |
| DM-3*8*3*100*90° | 3 | 8 | 3 | 100 | 90° |
| DM-2*4*4*50*90° | 2 | 4 | 4 | 50 | 90° |
| DM-3*8*4*50*90° | 3 | 8 | 4 | 50 | 90° |
| DM-4*8*4*50*90° | 4 | 8 | 4 | 50 | 90° |
| DM-4*8*4*75*90° | 4 | 8 | 4 | 75 | 90° |
| DM-4*8*4*100*90° | 4 | 8 | 4 | 100 | 90° |
| DM-5*10*5*50*90° | 5 | 10 | 5 | 50 | 90° |
| DM-5*10*5*75*90° | 5 | 10 | 5 | 75 | 90° |
| DM-5*10*5*100*90° | 5 | 10 | 5 | 100 | 90° |
| DM-6*12*6*50*90° | 6 | 12 | 6 | 50 | 90° |
| DM-6*12*6*75*90° | 6 | 12 | 6 | 75 | 90° |
| DM-6*12*6*100*90° | 6 | 12 | 6 | 100 | 90° |
| DM-8*16*8*60*90° | 8 | 16 | 8 | 60 | 90° |
| DM-8*16*8*75*90° | 8 | 16 | 8 | 75 | 90° |
| DM-8*16*8*100*90° | 8 | 16 | 8 | 100 | 90° |
| DM-10*20*10*75*90° | 10 | 20 | 10 | 75 | 90° |
| DM-10*20*10*100*90° | 10 | 20 | 10 | 100 | 90° |
| DM-12*24*12*75*90° | 12 | 24 | 12 | 75 | 90° |
| DM-12*24*12*100*90° | 12 | 24 | 12 | 100 | 90° |
| DM-14*28*14*100*90° | 14 | 28 | 14 | 100 | 90° |
| DM-14*28*14*150*90° | 14 | 28 | 14 | 150 | 90° |
| DM-16*32*16*100*90° | 16 | 32 | 16 | 100 | 90° |
| DM-16*32*16*150*90° | 16 | 32 | 16 | 150 | 90° |
| DM-18*36*18*100*90° | 18 | 36 | 18 | 100 | 90° |
| DM-18*36*18*150*90° | 18 | 36 | 18 | 150 | 90° |
| DM-20*40*20*100*90° | 20 | 40 | 20 | 100 | 90° |
| DM-20*40*20*150*90° | 20 | 40 | 20 | 150 | 90° |
| Workpiece Material Category | Applicable Hardness Range | Cutting Speed (Vc) | Feed Rate (fz) |
|---|---|---|---|
| Carbon Steel / Low-Alloy Steel | < 35 HRC | 120 m/min | 0.05D mm/z |
| Alloy Steel / Mold Steel | 35 – 48 HRC | Adjust according to rigidity | 0.03D – 0.05D mm/z |
| Gray Cast Iron / Ductile Cast Iron | < 32 HRC | 90 m/min | 0.05D mm/z |
| Stainless Steel | Austenitic / Martensitic | Use coolant & rigid setup | 0.02D – 0.04D mm/z |
| Aluminum Alloy / Copper Alloy | Non-ferrous Metals | High speed compatible | 0.05D – 0.08D mm/z |
| Hardened Die Steel | 45 – 55 HRC | Low Vc, constant feed | 0.02D – 0.03D mm/z |
*Note: Please fine-tune cutting speed and feed according to machine power, fixture rigidity, and coolant delivery.
A 90° spot drill creates a precise conical starting dimple that aligns with the chisel edge of subsequent twist drills, eliminating walking or drift on CNC machines. Additionally, it allows you to spot and chamfer in one pass by drilling slightly deeper than the secondary drill diameter.
Yes. Because of its rigid carbide substrate and solid flute design, this tool functions effectively as a 45°/90° edge chamfer milling cutter along linear or contoured workpiece contours.
The 10% cobalt binder provides high fracture toughness while maintaining superior hot hardness (HRA 91.2–91.7), resisting micro-chipping when engaging tough, pre-hardened alloy steels.
Yes, Durable Mills supplies standard lengths from 50mm up to 150mm and provides custom coatings (AlTiN, TiSiN) and non-standard shank diameters for volume industrial buyers.
Contact our tooling specialists directly for wholesale inquiries, custom geometry options, or stock availability.
