Dongfeng Bearing
SC Series Linear Motion Plain Bearing Bush
SC Series plain (sleeve) linear bearing with PTFE-impregnated bronze bushing replacing the ball circuit — contamination-tolerant, shock-resistant, and rated to 200°C. Covers shaft diameters 6–60 mm, ideal for foundry, woodworking, packaging, and high-temperature industrial equipment where ball bearings fail.
Highlights
- PTFE-impregnated bronze bushing replaces ball circuit — tolerates dust, chips, and grit that jam recirculating ball bearings
- Surface contact (not point contact) resists shock loads that brinell ball bearings — ideal for stamping and press equipment
- Operating temperature -50°C to +200°C — far exceeds polymer-caged ball bearing limits
- Self-lubricating dry running for food processing, textile, and cleanroom applications where grease is unacceptable
- Friction coefficient 0.08–0.12 dry, 0.04–0.06 greased — adequate for slow-speed and oscillating motion axes
- Available in closed sleeve (SC) and flanged (SCF) types covering shaft diameters 6–60 mm
| Bushing Series | SC 6–60 (11 sizes) |
|---|---|
| Material | PTFE-impregnated bronze (DU-type) |
| Backing | Steel ring, press-fit |
| Shaft Diameter | 6 mm – 60 mm |
| Friction Coefficient | 0.08–0.12 dry |
| Max Static Load (SC20) | 12 kN |
| Max PV Rating | 2.8 MPa·m/s (dry) |
| Operating Temperature | -50°C to +200°C |
| Tolerance | H7 bore |
| Types | SC (sleeve) / SCF (flanged) |
User Pain Point + Solution + Data
Recirculating ball linear bearings (LM series) are the default choice for smooth shaft-guided motion, but they fail in three scenarios: (1) dirty environments where dust enters the ball circuit and jams recirculation, (2) shock-loaded axes where point-contact balls brinell the raceway, and (3) low-speed or oscillating motion where balls skid instead of rolling, causing flat spots. The SC Series plain (sleeve) bearing solves all three by replacing the ball circuit with a solid PTFE-impregnated bronze bushing that slides on the shaft. The result is a contamination-tolerant, shock-resistant bearing with 0.08–0.12 friction coefficient — higher than ball types, but adequate for slow axes and vastly more durable in harsh environments.
Complete Specifications
| Parameter | Value |
|---|---|
| Bushing Series | SC 6 / 8 / 10 / 12 / 16 / 20 / 25 / 30 / 40 / 50 / 60 |
| Bushing Material | PTFE-impregnated bronze (DU-type composite) |
| Backing Material | Steel backing ring for press-fit |
| Shaft Diameter Range | 6 mm – 60 mm |
| Bushing Type | Closed sleeve (SC) / Flanged (SCF) |
| Friction Coefficient | 0.08–0.12 (dry), 0.04–0.06 (greased) |
| Max Static Load (SC20) | 12 kN |
| Max PV Rating | 2.8 MPa·m/s (dry), 5.0 MPa·m/s (greased) |
| Operating Temperature | -50°C to +200°C |
| Tolerance | H7 bore, press-fit outer diameter |
Product Advantages
Contamination Tolerant
With no ball recirculation circuit to jam, the SC plain bushing tolerates dust, metal chips, and grit that would destroy an LM ball bearing within hours. Ideal for foundry equipment, woodworking machinery, and outdoor actuators.
Dust ResistantShock Load Resistant
Surface-to-surface contact (not point contact) distributes impact loads across the full bushing length. Shock loads that brinell ball bearings leave the SC bushing unharmed, extending service life in stamping and press equipment.
Shock Resistant200°C Temperature Range
PTFE-impregnated bronze operates from -50°C to +200°C — far exceeding the 80–120°C limit of polymer-caged ball bearings. Suitable for oven conveyors, drying equipment, and high-temperature industrial environments.
200°C RatedSelf-Lubricating
PTFE-impregnated bronze provides dry lubrication without external grease. In applications where grease contamination is unacceptable (food processing, textile, cleanroom), the SC bushing runs dry with acceptable friction and wear life.
Dry RunningEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — established 2014, 10+ years in linear motion manufacturing. Our 5,000 m² facility in Xiamen operates 12 production lines with 200+ employees. The plain bearing cell produces SC series bushings at 50,000+ pieces per month, alongside our ball bearing and guideway production.
Certifications: ISO 9001:2015, CE, SGS factory audit. Export markets: 50+ countries including Germany, Italy, USA, India, Turkey, and Brazil. Partners: Supplying foundry equipment manufacturers, woodworking machine builders, packaging machinery OEMs, and food processing equipment producers.
Pre-sales: Application PV calculation and bushing size selection. After-sales: 18-month warranty, technical wear-life estimation service. Customer case: Supplied 20,000 SC20 bushings to an Indian foundry automation equipment manufacturer — 3-year average service life in high-dust environment where ball bearings previously failed within 3 months.
Manufacturing, Exhibition & Quality Control
Production Process & Quality Assurance
Process: Bronze strip + PTFE composite → precision sintering → boring to H7 tolerance → outer diameter grinding for press-fit → steel backing ring attachment → dimensional inspection → packaging. PTFE impregnation density verified per batch using weight-sampling method.
Quality testing: Bore diameter 100% gauged, PV wear test sampled per batch (500-hour continuous load test), friction coefficient verified on test rig. Exhibitions: Exhibited at CIMT (Beijing), IEMT (Shanghai), and Hannover Messe to engage harsh-environment machinery builders directly.
FAQ
What is the MOQ for SC plain bushings?
MOQ is 100 pieces per size. Mixed sizes accepted with 100-piece minimum per individual size. For less common sizes (SC40–SC60), MOQ may be 50 pieces — contact us to confirm. Sample quantities of 10–20 pieces available for qualified buyers.
What are the shipping options and lead time?
FOB Xiamen. In-stock sizes (SC6–SC25): 7–10 business days. Larger sizes (SC30–SC60): 15–20 business days. Express courier (DHL/FedEx) for samples: 5–7 days. Sea freight for bulk: 25–35 days to Europe, 18–25 days to USA.
How are SC bushings packaged?
Individual anti-corrosion oiled wrapping in plastic bags, then packed in partitioned cartons (50 pieces per carton for SC6–SC20, 25 pieces for SC25–SC40, 10 pieces for SC50–SC60). Wooden crate packing available for bulk export orders.
What payment methods do you accept?
T/T (30% deposit, 70% before shipment). L/C at sight for orders above USD 15,000. PayPal for sample orders under USD 2,000. Western Union for small orders on request.
Can I get samples for testing in my application environment?
Yes. Sample quantities of 10–20 pieces per size are available with buyer covering shipping. For bulk orders of 500+ pieces, sample cost is fully credited. We recommend testing in your actual environment since plain bearing wear life is highly application-dependent.
Do you offer OEM services and custom bushing dimensions?
Standard SC sizes follow JIS dimensions. Custom bushing lengths, non-standard bore diameters, or special backing materials are available for 500+ piece orders — share your drawing. OEM logo engraving on bushing outer ring available for 200+ piece orders.
Request a Quote for SC Plain Bushings
Send your shaft diameter, bushing type (SC or SCF), quantity, and operating environment details — we reply within one business day.
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