THK SC20UU Encased Type Linear Bushing Unit
THK SC20UU is a standard wide-case unit integrating a LM20UU linear bushing within a compact, lightweight aluminum housing, designed for bolt‑on installation in light‑to‑medium load linear motion systemsTHK America. It features UU double‑lip seals for dust protection and a synthetic resin retainer for smooth, quiet operation.
THK SC20UU is a standard wide-case unit integrating a LM20UU linear bushing within a compact, lightweight aluminum housing, designed for bolt‑on installation in light‑to‑medium load linear motion systems. It features UU double‑lip seals for dust protection and a synthetic resin retainer for smooth, quiet operation.
Official Specifications
| Parameter | Value |
|---|---|
| Inscribed Bore Diameter (dr) | 20 mm (0 / -0.010 mm) |
| Housing - Height (M) | 42 mm |
| Housing - Width (W) | 54 mm |
| Overall Length (L) | 50 mm |
| Mounting Hole Position | B: 40 mm; B₁: 7 mm; C: 40 mm |
| Tapped Holes (S×ℓ) | M6×12 |
| Through Bolt (S₂) | M5 |
| Center Height (J) | 21 mm (±0.02 mm) |
| W₁ | 27 mm (±0.02 mm) |
| K | 20 mm |
| W₂ | 52 mm |
| T | 11 mm |
| R | 20 mm |
| Basic Dynamic Load Rating (C) | 863 N |
| Basic Static Load Rating (C₀) | 1370 N |
| Mass | 237 g |
| Retainer Material | Synthetic resin |
| Seal Type | UU (double‑lip seals; seal resistance 0.49 N) |
| Housing Material | Aluminum |
| Bushing Outer Cylinder | Bearing steel |
| Oil Hole | None (OH option available on request) |
| Lubrication | Pre‑lubricated with anti‑rust oil; supports grease/oil lubrication |
| Operating Temperature | −15 °C to 80 °C (5 °F to 176 °F) |
| Accuracy Grade | High‑accuracy (standard); P-grade precision available |
Key Features
- Aluminum housing for lightweight, rigid installation
- UU double lip seals for effective dust and contamination resistance
- Synthetic resin retainer for smooth, low‑noise operation
- Precision ball contact for minimal friction and high accuracy
- Compatible with LM20UU precision shafts (recommended hardness ≥58 HRC)
Applications
Ideal for automation equipment, packaging machinery, office machinery, measuring instruments, and light‑duty linear motion systems requiring compact, easy‑to‑mount guidance.
