Airtac BSED Clamping Double Acting Cylinder BSED125X350S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X350S combines a double-rod ISO 15552 cylinder — a Ø32mm rod out BOTH ends for equal force both directions — with an integrated spring-applied, air-released ROD LOCK that holds up to 8600 N in either direction if air is lost. Ø125mm bore, 350mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke350 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X350S
The AirTAC BSED125X350S is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. A Ø32 mm rod exits both ends, yielding equal force in both directions—about 5734 N each way at 0.5 MPa. The fail-safe collet clamps the rod with 8600 N of static holding force, securing loads instantly if air pressure drops.
Because it is a double-rod design, the rear extension can mount a flag or cam for external limit sensing while resisting rotational torque. The lock engages only after the rod stops and releases via a dedicated G1/8 port when piston sides are pressure-balanced. This 125 mm bore includes a magnetic piston (-S) for CMSE or DMSE sensors, adjustable cushions at both ends, and operates at 30-500 mm/s within a 0.15-0.7 MPa pressure ceiling.
Double Rod + 8600 N Rod Lock (Ø125mm)
A rod exits both ends for symmetric force and back-rod tooling, and a spring clamps the collet so the Airtac BSED Clamping Double Acting Cylinder BSED125X350S holds its position in both directions on air loss or E-stop. Apply 0.15–0.7 MPa to the G1/8 release port to unlock. Engage only after the rod has stopped (not a dynamic brake), and release only when both piston sides are pressure-balanced; allow ≥0.5 s for full release.
Airtac BSED Clamping Double Acting Cylinder BSED125X350S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X350S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 mm |
| Static holding force | 8600 N |
| Cylinder port | PT1/2 |
| Lock-release port | G1/8 |
| Configuration | Double rod, double acting |
|---|---|
| Operating pressure | 0.15 – 0.7 MPa |
| Unlocking pressure | 0.15 – 0.7 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Max stroke | Up to 1000 mm |
Specifications follow the official AirTAC BSED datasheet. Rod thread M27×2 both ends. Mounting (BSED): Basic, LB, FA, TC. Port options: PT (standard) / G (BSPP); lock-release port is G1/8.
Theoretical Output Force (Ø125mm)
| Pressure | Force (both directions) |
|---|---|
| 0.5 MPa | 5734 N |
| 0.7 MPa (max) | 8027 N |
| Max drive (@0.7 MPa) | 819 kgf |
A rod exits both ends, so force is equal on extend and retract. Drive force is separate from the 8600 N static lock holding force. Size with a safety margin.
Model Code: Airtac BSED Clamping Double Acting Cylinder BSED125X350S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×350 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensor sensing. |
Thread: PT (blank) / G. Mounting (BSED): Basic, LB, FA, TC. Related: SED (double rod, no lock), BSE (single-rod rod lock). Sensors CMSE/DMSE fit magnetic BSED.
Where the Airtac BSED Clamping Double Acting Cylinder BSED125X350S Is Used
Heavy Press Ejection
Uses the equal 8028 N both-way drive to extend and retract heavy stamping blanks, while the 8600 N fail-safe lock holds the ejector pin rigidly during press cycling.
Large Vertical Lifts
Raises and lowers substantial machining fixtures with symmetric force, relying on the spring-applied collet to prevent gravity-driven drops if shop air is interrupted.
Guided Weldment Indexing
Shifts heavy automotive sub-assemblies back and forth, using the rear rod for a cam follower to maintain anti-rotation stability while the lock holds position during welding.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X350S the Right Cylinder?
Select this 125 mm bore when your application requires both-way symmetric drive (8028 N at 0.7 MPa) and high static holding. Verify your load stays under the 8600 N holding capacity. If you need less force, the adjacent 100 mm bore provides 3681 N at 0.5 MPa and 5500 N holding; as the largest standard size, stepping up requires a custom multi-cylinder configuration.
When replacing or ordering, match the 350 mm stroke, PT1/2 cylinder port, and mounting choice (Basic, LB, FA, or TC). At 350 mm stroke, use external guide rails to prevent side-load binding on the long 32 mm rod. Always allow at least 0.5 s for the lock to release after balancing pressure, and never use it as a dynamic brake. For overhead or man-rated loads, employ separate safety-rated controls.
Quick checklist
- ✓ Need both symmetric force AND fail-safe hold?
- ✓ Load to hold ≤ 8600 N?
- ✓ Back-rod space for tooling/flag
- ✓ Lock engaged only when stopped
- ✓ G1/8 release-air line available
Installation & Safety Notes
- check Engage the lock only after the rod has stopped — not a dynamic brake.
- check Release only when both piston sides are pressure-balanced.
- check Allow ≥0.5 s for full release before commanding motion.
- check Feed the G1/8 release port with 0.15–0.7 MPa clean air.
- check Support both rod ends; avoid side load.
- check Use BSED mounting (Basic/LB/FA/TC).
Airtac BSED Clamping Double Acting Cylinder BSED125X350S FAQ
This cylinder provides equal drive force in both directions: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The integrated fail-safe rod lock provides a separate static holding force of 8600 N with no live air required.
The lock is not a dynamic brake and must only be engaged after the rod stops. To release it, balance pressure on both piston sides, apply air to the dedicated G1/8 release port, and wait at least 0.5 seconds before commanding cylinder motion.
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