THK SHW21 Linear Motion Caged Ball Bearing Carriage Block

Description:

The THK SHW21 Linear Motion Caged Ball Bearing Carriage Block is a wide-profile linear guide block measuring 21 mm × 68 mm × 59 mm, engineered for SHW21 series guide rails to deliver high rigidity, excellent moment load capacity, and smooth, accurate linear motion. Commonly installed in semiconductor manufacturing equipment, precision automation systems, medical devices, packaging machinery, robotic equipment, and industrial inspection systems requiring compact yet rigid linear guidance. Maintenance teams and system integrators use this carriage block for machine repair, OEM replacement, retrofit projects, and restoring precision linear motion performance.

Applications:

The THK SHW21 carriage block is designed for precision linear motion systems where compact dimensions, high load capacity, and superior moment rigidity are essential. Its wide-rail configuration enables stable operation in single-axis applications and is widely used in CNC auxiliary axes, laboratory automation, electronic assembly equipment, vision systems, pick-and-place machines, and precision material handling equipment.

Technical Specifications:

• Manufacturer: THK
• Product Type: Linear Motion Caged Ball Bearing Carriage Block
• Series: SHW Caged Ball LM Guide
• Model: SHW21CA
• Compatible Rail Size: SHW21
• Overall Height: 21 mm
• Overall Width: 68 mm
• Overall Length: 59 mm
• Block Style: CA Flange Type
• Mounting Style: Flanged block with tapped holes for top or bottom mounting
• Guide Type: Wide-Rail, Low-Profile Linear Motion Guide
• Ball Retainer: Caged Ball Design
• Dynamic Load Rating: 8.24 kN
• Static Load Rating: 12.8 kN
• Mounting Hole Thread: M5
• Weight: Approximately 0.24 kg
• Lubrication: Grease or Oil Lubrication
• Seal Options: UU or SS end seals available
• Accuracy Grades: Normal, High (H), Precision (P), Super Precision (SP), Ultra Precision (UP)
• Material: Hardened Bearing Steel (stainless steel version available with "M" designation)
• Features: Four-way equal load design, high moment rigidity, low-profile construction, self-aligning capability, low noise, long service life, high-speed operation, and compatibility with THK QZ lubrication systems.

Common Replacements:

• THK SHW21CA1UU
• THK SHW21CAN
• THK HRW21CA