30-Second Summary: Deep hole drilling is found across all precision manufacturing industries. The table below shows typical specifications (L/D, tolerance, material) for each application — use it to match your own parts against known benchmarks. Key growing sectors include EV motor shafts (requiring deep oil passages) and medical implants (requiring micron-level precision in titanium).
Applications by Industry
| Industry | Typical Part | Diameter | L/D Ratio | Tolerance | Common Materials |
|---|---|---|---|---|---|
| Aerospace | Landing gear cylinder | 50-200 mm | 10:1-30:1 | IT7-IT8 | 300M, 4340, 15-5PH |
| Aerospace | Engine turbine shaft | 20-80 mm | 20:1-80:1 | IT7-IT9 | Inconel 718, Waspaloy |
| Aerospace | Fuel nozzle | 0.5-5 mm | 10:1-50:1 | IT6-IT7 | Stainless 304, 17-4PH |
| Aerospace | Actuator housing | 10-40 mm | 5:1-20:1 | IT6-IT8 | Aluminum 7075, Titanium 6Al-4V |
| Automotive | Crankshaft oil passage | 4-12 mm | 30:1-100:1 | IT9-IT11 | Microalloyed steel, ductile iron |
| Automotive | Fuel injector bore | 1-6 mm | 10:1-40:1 | IT6-IT8 | Stainless 430, 11SMn30 |
| Automotive | Connecting rod bolt hole | 6-14 mm | 8:1-20:1 | IT8-IT9 | C70, 42CrMo4 |
| Automotive | EV motor shaft oil passage | 6-20 mm | 20:1-80:1 | IT8-IT9 | 42CrMo4, 20MnCr5 |
| Automotive | Transmission shaft bore | 10-30 mm | 15:1-40:1 | IT7-IT8 | Case-hardened steel, 20MnCr5 |
| Mold & Die | Cooling channel | 6-20 mm | 20:1-150:1 | IT9-IT11 | P20, H13, 718 |
| Mold & Die | Ejector pin hole | 2-12 mm | 20:1-80:1 | IT7-IT8 | H13, D2 |
| Hydraulic | Cylinder tube | 40-300 mm | 10:1-60:1 | IT8-IT9 | E355, St52, CK45 |
| Hydraulic | Valve body spool bore | 10-50 mm | 5:1-20:1 | IT6-IT7 | GG25, GGG40, AL6061 |
| Hydraulic | Piston bore | 20-80 mm | 5:1-15:1 | IT7-IT8 | Hard chrome plated steel |
| Oil & Gas | Drill collar bore | 50-200 mm | 20:1-80:1 | IT9-IT11 | AISI 4145H, 4340 |
| Oil & Gas | Downhole tool bore | 10-80 mm | 10:1-50:1 | IT8-IT9 | Inconel 718, 17-4PH |
| Oil & Gas | Christmas tree valve bore | 30-150 mm | 5:1-15:1 | IT7-IT9 | 4130, F22, Inconel 625 |
| Medical | Bone screw cannulation | 2-6 mm | 5:1-20:1 | IT6-IT7 | Ti-6Al-4V ELI, 316LVM |
| Medical | Surgical instrument bore | 1-8 mm | 10:1-40:1 | IT7-IT8 | Stainless 420, 17-4PH |
| Medical | Dental implant bore | 1-3 mm | 5:1-15:1 | IT6-IT7 | Ti Grade 23, ZrO₂ (green) |
| Medical | Orthopedic drill guide | 3-12 mm | 8:1-30:1 | IT7-IT8 | Stainless 304, Ti-6Al-4V |
| Defense | Gun barrel | 5-30 mm | 50:1-300:1 | IT7-IT9 | 4140, 4150, stainless |
| Defense | Missile component | 10-100 mm | 10:1-50:1 | IT7-IT8 | Aluminum 7075, Titanium |
| Rail | Axle bore | 20-60 mm | 20:1-50:1 | IT8-IT9 | EA1N, EA4T |
| Rail | Brake cylinder | 50-150 mm | 5:1-15:1 | IT8-IT9 | GG25, ductile iron |
💡 How to use this table: Find the row closest to your part's specifications, then check which method and material combination is commonly used. Refer to the Method Selection Wizard for detailed process recommendations. For EV and medical applications, tolerances are trending tighter — consider specifying IT6 where possible to future-proof process capability.