Custom Precision Bushings
Sleeve, flanged, drill jig, and liner bushings machined to ±0.005mm tolerance from steel, brass, bronze, stainless steel, and aluminum. Swiss-type turning enables Ø0.5mm minimum bore with Ra≤0.4µm bore finishes. IATF 16949 and AS9100D certified production.
All Major Bushing Types, Machined Custom
A precision bushing is a cylindrical component that lines a bore to control shaft alignment, reduce friction, transfer load, or guide a cutting tool. Unlike catalog parts, custom-machined bushings are built to your exact ID/OD dimensions, length, fit class, and surface finish — with no compromise on concentricity or bore geometry.
Richconn’s Swiss-type turning centers (CITIZEN A20, Tsugami B206, YM LM-06Y) and MAZAK turn-mill machines give us the equipment depth to hold tight bore tolerances across small-diameter precision bushings, large-OD flanged bushings, and everything in between — from prototype quantities to production volumes of hundreds of thousands of pieces.
Sleeve / Plain Bushings
Cylindrical liner pressed into a housing bore. Reduces friction between shaft and housing. Used in motors, pumps, gearboxes, and hydraulic systems.
ID: Ø0.5–150mm · Fit: H7/f6 or custom
Flanged Bushings
Sleeve with an integral flange collar that provides axial positioning and prevents the bushing from pushing through the housing under load.
Flange OD: custom · Axial clearance: per dwg
Drill Jig / Liner Bushings
Hardened, ground bushings that guide drill bits or reamers in a fixture. Permanent press-fit or renewable slip types with tight ID/OD concentricity.
Concentricity: ≤0.003mm · HRC 58–62 available
Step / Reducing Bushings
Transitions between two shaft diameters or bore sizes in a single part. Common in tooling adapters, hydraulic fittings, and motor mounts.
Multi-step profiles · complex OD geometry
Thin-Wall Bushings
Wall thickness as low as 0.3mm for space-constrained assemblies in medical devices, robotics, and consumer electronics. Swiss-type machining ensures roundness under thin walls.
Wall thickness: ≥0.3mm · OD roundness: ≤0.002mm
Threaded Bushings
Internal or external threads for insert or captive-nut applications in assemblies requiring frequent disassembly. Threads per ISO/ASME/DIN standard or custom pitch.
Thread class 6H/6g standard · custom available
By-Feature Precision Capabilities
Every bushing feature is held to defined process capability targets. Below are the limits our equipment and inspection routines can reliably support across production volumes.
Bore (ID) Machining
Swiss turning + boring · Ra verified per lot
- Minimum bore Ø0.5 mm
- Maximum bore Ø150 mm
- Bore diameter tolerance±0.005 mm
- Bore roundness≤0.002 mm
- Bore surface finishRa ≤0.4 µm
- Cylindricity≤0.005 mm
- Standard fit classesH5, H6, H7, H8
OD & Concentricity
CNC turn-mill · CMM ±0.001mm verification
- OD tolerance±0.005 mm
- OD roundness≤0.002 mm
- ID–OD concentricity≤0.003 mm
- OD surface finishRa ≤0.8 µm
- Standard OD fitsh6, k6, n6, s6
- CMM verification±0.001 mm
- Press-fit OD capabilityn6 / s6 class
Length & Geometry
Live-tool milling · sub-spindle secondary ops
- Length tolerance±0.01 mm
- Flange perpendicularity≤0.005 mm
- Chamfer angle tolerance±0.5°
- Slots / cross-holesLive-tool milled
- Knurl / grooveOn OD or ID
- Squareness (end faces)≤0.005 mm
- Max part length300 mm (bar stock)
Key Dimensional Guarantees
All values represent process capability (Cpk ≥1.33) achievable in routine production — not one-off showpiece parts. First-article inspection reports and dimensional records available on request.
Bore (ID) Diameter
Swiss turning · CITIZEN A20 / Tsugami B206
Outer Diameter (OD)
MAZAK turn-mill / YM LM-06Y
ID-OD Concentricity
Guide bushing spindle design
Bore Roundness
CMM profiling instrument verified
Bore Surface Finish
Roughness meter + honing available
CMM Measurement Accuracy
Mitutoyo CMM · ISO 10012 calibration
Common Bushing Materials We Machine
Material selection drives bushing performance. The right alloy must balance wear resistance, machinability, corrosion resistance, and cost for the operating environment. We stock or source all common grades.
Carbon Steel / Alloy Steel
Grades: 1045, 4140, 4340, 52100
Hardness: Up to HRC 62 (post heat treat)
Machinability: Excellent (free-cutting grades)
Best for: drill jig bushings, high-load sleeve bushings, press-fit applications. Can be case-hardened for wear surface.
Stainless Steel
Grades: SS303, SS304, SS316L, SS17-4PH
Corrosion: Excellent (304/316L)
Strength: 17-4PH up to 1310 MPa UTS
Best for: food processing, marine, medical, and chemical equipment where corrosion resistance is required alongside tight tolerances.
Brass (C360 / C272)
Machinability: Excellent (C360 = 100% rating)
Friction: Low self-lubricating properties
Electrical: Good conductivity
Best for: light-load bearing bushings, electrical connectors, pneumatic valve components, and applications requiring non-magnetic properties.
Phosphor Bronze / Copper Alloy
Grades: C510, C630 (Al-Bronze), SAE 841
Bearing rating: Excellent PV factor
Self-lube: Porous / oil-impregnated available
Best for: high-load rotating shaft bushings, hydraulic systems, marine bearings. Superior sliding properties vs. steel-on-steel.
Aluminum Alloy
Grades: 6061-T6, 7075-T6, 2024-T3
Weight: ~2.7 g/cm³ (vs 7.8 steel)
Anodizing: Hard anodize (Type III) available
Best for: aerospace brackets, robotics, lightweight automotive assemblies where low mass is critical. Hard anodize improves surface hardness to ~450 HV.
Inconel / Titanium
Grades: Inconel 625/718, Ti-6Al-4V
Temp resistance: Inconel up to 980°C
Corrosion: Exceptional (both alloys)
Best for: aerospace engine components, downhole oilfield tools, semiconductor process equipment with high-temperature or highly corrosive media.
Post-Machining Treatments
Secondary operations that improve corrosion resistance, surface hardness, lubricity, or appearance — applied in-house or through our qualified supplier network.
Honing
Bore Ra≤0.2µm achievable. Shannen honing machines × 5 in-house.
Heat Treatment
Through-hardening or case hardening up to HRC 62. Drill jig bushing grade.
Hard Chrome Plating
OD build-up to spec tolerance after plating. Wear and corrosion resistance.
Black Oxide
Mild corrosion protection with dimensional neutrality (≤0.001mm thickness).
Electroless Nickel
Uniform plating inside bores — ideal for stainless and aluminum bushings.
Hard Anodize (Al)
Type III anodize for aluminum bushings. Surface hardness ~450HV.
Where Our Precision Bushings Are Used
Our engineering team understands the functional requirements in each environment. We select the right material, fit class, and finish based on operating load, speed, temperature, and media — not catalog defaults.
Industrial Machinery & Automation
Sleeve and flanged bushings in conveyor systems, actuator housings, and rotary indexers where shaft alignment directly affects cycle accuracy and part life.
- Steel or bronze bushing, H7/f6 or H7/g6 fit
- Surface: Ra ≤0.8µm bore / black oxide OD
- Volume: 500–100,000 pcs
Aerospace & Defense
Control surface linkage bushings, control arm pivot liners, and landing gear components. Material certification, material traceability, and first-article reports per AS9100D.
- Ti-6Al-4V / Inconel 718 / Al-Bronze
- AS9100D certification · FAIR available
- XRF composition verification per lot
Automotive & EV
Suspension pivot bushings, transmission selector fork liners, EV motor mount inserts, and seat mechanism bearings. IATF 16949 process control, PPM ≤1000 quality target.
- IATF 16949:2016 certification
- Steel 4140 / SS304 / Al 6061-T6
- Salt spray test per ASTM B117
Medical & Laboratory
Precision guide bushings in surgical robotic arms, laboratory instrument carriages, and diagnostic equipment linear stages. Tight concentricity required for repeatable motion accuracy.
- SS316L / Titanium / PEEK
- Ra ≤0.4µm bore finish
- Concentricity ≤0.003mm
Hydraulics & Pneumatics
Cylinder rod guide bushings and valve body inserts where bore-to-OD concentricity and surface finish determine leakage rate and seal life. Bronze and stainless for corrosive media.
- Bronze C630 / SS303 / 4140 steel
- H7/f6 or H7/g6 fit class standard
- Ra ≤0.4µm bore for dynamic sealing
Robotics & Semiconductor
Joint pivot bushings in collaborative robots, wafer handler arm liners, and vacuum chamber guide sleeves where ultra-low particle generation and non-magnetic materials are required.
- SS304 / SS316L / BeCu / Titanium
- Thin-wall: wall ≥0.3mm capable
- Hyundai robotics — existing program experience
Measurement & Certification
Our quality system is built on documented processes, calibrated instruments, and preventive control plans — not end-of-line sorting. Every lot of precision bushings ships with dimensional records.
Standard Documentation Package
- First Article Inspection Report (FAIR / PPAP on request)
- Dimensional inspection record (ID, OD, length, concentricity)
- Surface roughness Ra measurement report
- Material certification with heat/lot traceability
- XRF composition verification (aerospace / medical lots)
- Salt spray test report (where specified)
Inspection Equipment
- Mitutoyo CMM — ±0.001mm dimensional verification
- Bore gauge & air gauge — high-volume bore diameter checking
- Surface roughness meter — Ra measurement per ISO 4287
- Profiling instrument — roundness and cylindricity
- Height gauge — length and step verification
- Optical comparator (CCD) — profile and thread inspection
- Micrometers & pin gauges — inline SPC measurement
- XRF analyzer (Seiko SII SEA1000A) — alloy composition verification
- Salt spray chamber — ASTM B117 corrosion testing
The Manufacturing Advantage
Six reasons engineers and procurement teams choose Richconn for precision bushing programs — from prototypes to high-volume contracts.
Swiss-Type Turning for Thin & Small Bores
Our CITIZEN A20 Swiss machines guide the workpiece at the cutting point — eliminating deflection. That's why we can reliably hold ±0.005mm bore tolerance on Ø0.5mm to Ø25mm parts that flex under cutting forces on conventional lathes.
54+ Machines. No Capacity Bottleneck.
15× CITIZEN A20, 20× Tsugami B206, 18× MAZAK turn-mill centers, 2× MAZAK HCN5000L horizontal machining centers, and more. We handle surge volumes without extending lead times or outsourcing to unqualified sub-suppliers.
Certified for Your Industry
IATF 16949:2016 for automotive. AS9100D for aerospace. ISO 10012 for measurement system calibration. ISO 14001 for environment. These certifications reflect documented processes, not just a wall certificate — we can provide audit records.
Complete In One Program
Turning, milling, threading, honing, heat treatment, plating coordination, and CMM inspection — all managed under one purchase order. No fragmented supply chains requiring you to coordinate separate vendors for secondary operations.
DFM Input Before You Cut Steel
Our engineers review your drawing before quoting. We flag features that add cost without improving function — tight tolerances in non-critical zones, exotic finishes where standard works, or geometries that can be simplified without sacrificing fit.
Prototype-to-Production Under One Roof
Same equipment, same process parameters, same QC plan from first prototype through production release. You don't re-validate when you scale. Programs start at 5 pieces and routinely reach 500,000+ pieces per year.
From Drawing to Shipped Bushings
A predictable 7-stage process with defined hand-offs, inspection gates, and documentation at each step.
1. RFQ & DFM Review
Drawing review, DFM feedback, material confirmation, tolerance feasibility check
2. Quotation
Itemized quote: machining, material, finishing, inspection, tooling (if needed)
3. Process Planning
CNC programming, work-holding design, control plan, inspection plan
4. First Article
Full dimensional FAIR. All features measured. Customer approval before production release
5. Production
SPC-monitored machining runs. In-process inspection at defined intervals
6. Final Inspection
CMM verification, surface finish check, visual, documentation package compiled
7. Pack & Ship
Precision packaging, corrosion protection. CoC and records shipped with parts
Request a Bushing Quote
Send us your drawing and specifications. We respond with a detailed quote and DFM feedback within 24 hours.
24-Hour Quote Turnaround
Detailed quote including material, machining, finishing, and inspection costs — not a ballpark estimate.
Free DFM Review
We flag tolerance or geometry issues that could add cost before you commit to tooling or fixturing.
No Obligation
Quote and DFM feedback are provided at no charge, regardless of whether you proceed with an order.
NDA Available
We sign mutual NDAs before reviewing sensitive drawings for new or unpatented designs.