Pneumatic clamping unit GN 8621

manualworkpiecewelding

Product overview
Power clamps GN 8621 hold and position parts such as sheet metal panels in automated welding processes or grip and secure parts in transfer and mounting mechanisms. The clamping arm transmits the clamping force produced pneumatically or via the manual lever from the knee-lever mechanism to the workpiece. The quick swivel movement enables short cycle times and the pneumatic end-position damping ensures smooth movement.

Operation and benefits
The removable hand lever simplifies set-up and troubleshooting; it can be mounted on either side and removed during pneumatic operation to prevent unintended actuation. The clamping arm opening angle can be set or limited at any position. End positions are detected by sensors integrated into the internal mechanism and require no adjustment. The entire mechanism is encapsulated in an aluminum housing to protect against dirt and water spray. Reinforced, weight-optimized housing design and high-quality needle bearings and joints provide long service life.

Specification

• Housing: Aluminum
• Square shaft: Steel, nitrided
• Air cylinder: Double-acting, operating pressure 2–8 bar
• Inductive sensor: Zinc die-cast housing
• Hand lever: removable; shaft steel zinc-plated, blue passivated; handle plastic, red
• Clamping arm (type S): Anodized aluminum; clamp piece steel zinc-plated

Accessories

• GN 330 Cables with connector coupling (4-pole, 5 or 10 m)
• DIN 6325 Dowel pins (steel)
• DIN 7979 Dowel pins (steel with internal thread)

Article options / Table
Type | Description
S | With clamping arm
O | Without clamping arm

Switch output | P = PNP

Identification no. | 1 = Without hand lever
2 = With straight hand lever
3 = With bent hand lever

Notes
RoHS compliant

Technical characteristics

• Typical applications: Automated welding, transfer and mounting mechanisms, part holding and positioning
• Movement: Quick swivel movement with pneumatic end-position damping
• Protection: Encapsulated mechanism in aluminum housing (protection against dirt and water spray)
• Internal components: High-quality needle bearings and joints for long service life
• Available piston diameters: 25, 40, 63
• Indicative values at 5 bar: Ø25 → max torque ≈ 50 Nm / F_S ≈ 530 N / F_H ≈ 800 N; Ø40 → 130 Nm / 1,110 N / 3,240 N; Ø63 → 390 Nm / 2,700 N / 10,410 N
• Example article no.: GN 8621-40-S-P-3
• Weight (example): 2.000 kg