Sleeve Bushing
High-quality sleeve bushings for automotive, industrial machinery, and marine applications. Available in bronze, bimetallic, and PTFE-lined materials with self-lubricating options.
Sleeve Bushing
Sleeve bushings are cylindrical bearings that provide smooth rotational or linear movement between two parts. They reduce friction, absorb vibration, and support radial loads in a wide range of mechanical systems.
Our sleeve bushings are precision-bored to H7 tolerance and available in bronze, bimetallic steel-bronze, and PTFE-lined variants. Self-lubricating options eliminate the need for external grease, reducing maintenance and extending service life.
Technical Specifications
Standard Dimensions
| Model | Inner Dia (mm) | Outer Dia (mm) | Length (mm) | Material |
|---|---|---|---|---|
| SB-2528-30 | 25 | 28 | 30 | CuSn6P Bronze |
| SB-4047-50 | 40 | 47 | 50 | CuSn8P Bronze |
| SB-6070-60 | 60 | 70 | 60 | Bimetallic |
| SB-8095-80 | 80 | 95 | 80 | Bimetallic |
| SB-100115-100 | 100 | 115 | 100 | PTFE-Lined |
| SB-150170-120 | 150 | 170 | 120 | PTFE-Lined |
* Custom dimensions available for specific applications
Material Specifications
| Material | Composition | Features |
|---|---|---|
| CuSn6P Bronze | Cu 88%, Sn 6%, P 0.3% | High load, self-lubricating |
| CuSn8P Bronze | Cu 86%, Sn 8%, P 0.3% | Excellent wear resistance |
| Bimetallic | Steel backing + Bronze layer | High strength, cost-effective |
| PTFE-Lined | Steel + PTFE composite | Low friction, dry running |
| CuZn25Al5 | C86300 Aluminum Bronze | High strength, corrosion resistant |
Performance Parameters
| Parameter | Standard Range | Custom Options |
|---|---|---|
| Inner Diameter | 10–300mm | Up to 500mm |
| Wall Thickness | 1–30mm | Custom |
| Length | 10–500mm | Up to 1000mm |
| Load Capacity | Up to 150MPa | Custom |
| Operating Temp | -40°C to +300°C | Special alloys |
| PV Limit | ≤20 MPa·m/s | Custom |
Manufacturing Process
Our precision machined parts are manufactured through a 12-step CNC machining process from certified steel bars, including heat treatment, precision grinding, and rigorous QC to meet tight tolerances and demanding performance requirements.
Raw Material Receiving & Testing
Certified forged or hot-rolled round bars are received with EN 10204 3.1/3.2 certificates. Incoming inspection checks chemistry, hardness, UT cleanliness, and dimensional tolerance.
Sawing / CNC Cutting to Blanks
Bars are cut to blank lengths using CNC band saws or circular cold saws with ±0.5 mm length tolerance, minimizing material waste.
Rough Turning
Blanks are rough-turned on CNC lathes to remove scale, decarburization, and forging skin, leaving 1.5–2 mm stock per side for finishing operations.
Heat Treatment
Components undergo quenching and tempering (Q&T), carburizing, or induction hardening per specification to achieve case hardness (HRC 55–62) and core toughness.
Finish Turning & Boring
Precision CNC turning achieves OD/ID tolerances to IT6–IT7 with Ra 0.8–1.6 μm surface finish. Sleeve bushings are internally bored and honed to H7 tolerance.
Milling, Drilling & Keyway Cutting
Keyways, oil grooves, cross holes, and wrench flats are machined on CNC machining centers or using broaching/slotting machines.
Cylindrical & Surface Grinding
Critical diameters and sealing surfaces are precision ground to achieve Ra 0.2–0.4 μm and tight dimensional tolerances (≤0.01 mm).
Dynamic Balancing (Rotating Parts)
Shafts and rotating components are balanced on dynamic balancing machines to G2.5 or G6.3 grade to prevent vibration at operating speeds.
NDT (UT/MT/PT)
Critical components undergo ultrasonic testing for internal soundness and magnetic particle or dye penetrant testing to detect surface cracks.
Surface Treatment
Parts are blackened, zinc-plated, phosphated, or coated with anti-corrosion oil as required. Mating surfaces are protected with peelable coatings.
Dimensional & Hardness QC
100% dimensional inspection using micrometers, bore gauges, CMM; hardness testing (HRC/HRB/HV) on every batch; thread gauging for threaded connections.
Rust Prevention & Packaging
Parts are oiled with rust-preventive oil, wrapped in VCI anti-corrosion paper, packed in plywood cases with desiccant, and labeled per customer requirements.
Applications
Where our products deliver proven performance across industries worldwide.
Hydraulic Pump & Motor Bushings
Bushed pump housings and rotating groups in bronze, steel-backed bimetal, and cast iron — the wear interface of hydraulic piston and gear pumps.
✓ Bimetal & bronze options
Engine & Compressor Bushings
Camshaft, rocker arm, connecting rod, and compressor bushings in cored bronze and bimetal strips, sized for press-fit installation.
✓ Precision press-fit tolerances
Machine Tool & Spindle Bushings
Spindle and slide bushings in hardened steel and bronze with precision bore for machine tool rebuilds and OEM equipment.
✓ H6/H7 bore tolerances
Automotive Suspension & Steering
Suspension bushings, king-pin bushings, and steering components in bimetal and polymer-lined designs for OEM and aftermarket.
✓ OEM-specification supply
Marine Stern Tube & Rudder Bushings
Water-lubricated stern tube bearings in bronze and composite materials for vessels, class-approved on request.
✓ Class certification options
Custom Bushings to Drawing
Complete machined bushing supply to your drawing — flanged, shouldered, grooved, or drill-lubricated designs.
✓ Turnkey from forging/casting to finish
Frequently Asked Questions
What types of bushings do you supply?＋
Solid bronze (CuSn8, CuPb10Sn10), steel-backed bimetal (CuPb10Sn10 on steel), cast iron, polymer-lined, and fully machined steel bushings — flanged, plain, or custom.
What manufacturing processes do you use?＋
Centrifugal casting, bimetal strip rolling and forming, powder metallurgy, and full machining from forged bar — selected per design and volume.
What tolerances can you hold?＋
Bore to H6/H7, OD press-fit to r6/s6, surface finish Ra 0.4–1.6, with oil grooves, indentations, or graphite plugs per design.
What standards apply to bushing materials?＋
EN/DIN material grades (CuSn8, CuPb10Sn10, CuZn31Si), ASTM B505 bronzes, and SAE 660/797 equivalents with EN 10204 3.1 certification.
What is the minimum order quantity and lead time?＋
From prototype single pieces to production runs; standard material bushings 2–6 weeks, castings 6–10 weeks. Contact us with your drawing.
Can you supply to my drawing with special features?＋
Yes — oil grooves, grease holes, flanges, chamfers, graphite plugs, and special coatings, machined complete to drawing.
How is quality verified?＋
Dimensional and hardness reports, material chemistry per heat, density/porosity checks on castings, and penetration tests on bimetal bonding.
What documentation is provided?＋
EN 10204 3.1 MTCs, dimensional inspection reports, and material certificates per lot.
Can you help select the right bushing material for my application?＋
Yes — provide load (P), speed (V), temperature, and lubrication conditions; we recommend material and design per standard PV criteria.
Do you offer OEM-volume production?＋
Yes — with process control, PPAP-style documentation, and annual volume agreements for OEM customers.
Ready to Order Sleeve Bushings?
Get a competitive quote within 24 hours. Our engineering team provides expert consultation for your bushing application needs.
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