Our Drill Guide Bushing, also known as drill jig bushing, is a core precision fixture component professionally CNC machined in-house. Adhering to ASME B94.33 and DIN 179 industrial standards, it is engineered to guide drill bits, reamers and counterbore tools effectively. It eliminates drill wandering, controls hole position deviation, reduces machining vibration, and delivers high repeatability and high wear resistance for mass production, 5-axis CNC machining, mold processing, aerospace, automotive, medical equipment and general machinery manufacturing.
Product Classification
Press-Fit Fixed Drill Guide Bushing
Integral one-piece structure, press-fitted into fixture mounting holes with H7 tolerance. High rigidity, no assembly clearance, suitable for high-volume repetitive drilling; matched tolerance ID F7 / OD n6, overall hardness up to 60–65 HRC.
Renewable Replaceable Drill Guide Bushing
Combination design of liner + bushing, no need to disassemble fixture for quick replacement. Divided into slip-renewable and screw-renewable types, applicable for medium and small batch multi-spec drilling operations, greatly reducing fixture replacement downtime.
Special CNC Custom Bushing
- Flanged drill guide bushing: With positioning flange, suitable for thin-walled workpieces and inclined plane drilling alignment
- Carbide-tipped drill guide bushing: Steel body with carbide inner wall liner, for high-speed drilling of stainless steel, titanium alloy and high-hardness materials
- Coolant-fed drill guide bushing: Internal cooling channel design, optimized for deep hole drilling chip removal and heat dissipation
Material Specification & Performance Comparison
| Material Grade | Hardness | Core Performance | Applicable Scenarios | Cost Level |
|---|---|---|---|---|
| GCr15 Bearing Steel | 60–65 HRC | High wear resistance, stable dimension, good comprehensive mechanical property | General CNC drilling, carbon steel & aluminum workpiece mass production | Economy |
| 42CrMo Alloy Steel | 50–55 HRC | Strong impact toughness, easy processing and heat treatment | Heavy duty deep hole drilling, low and medium batch processing | Mid-range |
| SKD11 / D2 Tool Steel | 58–62 HRC | High temperature resistance, corrosion resistance, small deformation | Precision mold drilling, aerospace high-precision parts | Mid-high |
| YG6 / YG8 Tungsten Carbide | 70–75 HRC equivalent | Ultra-high hardness, long service life, anti-abrasion | Hardened steel, Inconel, titanium alloy high-speed drilling | Premium |
| 304/316 Stainless Steel | 40–45 HRC after hardening | Anti-corrosion, non-magnetic, rust-proof | Medical equipment, food machinery, marine environment | Mid-range |
CNC Machining & Precision Control
- Raw Material Cutting & Preprocessing: Precision bar cutting, end face deburring, strict blank size control to lay the foundation for subsequent finishing.
- CNC Turning Rough & Finish Machining: Adopt high-precision CNC lathe for rough turning reserved margin 0.2–0.3mm; finish turning controls overall length tolerance ±0.005mm, standard chamfer and rounded corner processing.
- Vacuum Heat Treatment: Professional quenching and tempering process, stabilize internal structure, avoid post-processing deformation, ensure long-term service hardness stability.
- Ultra-Precision Grinding: Internal and external circular grinding + end face compound grinding, inner hole surface roughness Ra ≤0.08μm, perpendicularity error ≤0.01mm, meet high-precision assembly requirements.
- Full Inspection Quality Control: CMM dimensional detection, Rockwell hardness test, surface roughness profiling inspection, all products fully inspected before delivery.
Industrial Application & Actual Engineering Effect
Our CNC machined drill guide bushings solve core pain points such as hole position deviation, tool chatter, low yield and rapid bushing wear in workshop drilling:
- Effectively control hole position deviation within ±0.005mm, scrap rate reduced from 8% to below 0.5%
- Suppress machining vibration, improve workpiece surface finish, reduce secondary finishing procedures
- High-hardness material configuration extends drill bit and bushing service life by 35%–80%, reduce production downtime and replacement cost
- Widely used in automotive engine parts, aerospace structural parts, medical instruments, mold manufacturing, oil machinery precision hole processing scenarios
Product Features
- Standard and custom dimensions available, ID 1mm–50mm, OD 3mm–60mm customizable
- Strictly follow ASME / DIN industrial standard tolerance
- One-stop service from material selection, CNC machining, heat treatment to precision grinding
- High concentricity, high wear resistance, strong interchangeability for fixture assembly
- Support non-standard drawing customization, one-off prototype and mass production
