Airtac BSED Clamping Double Acting Cylinder BSED125X75S
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X75S 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, 75mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke75 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X75S
The AirTAC BSED125X75S is a double-acting, double-rod ISO 15552 profile cylinder featuring an integrated spring-applied, air-released rod lock. A rod exits both ends, delivering equal force in both directions—specifically 5734 N each way at 0.5 MPa and 8028 N at 0.7 MPa. The rear rod is ideal for mounting cams or flags and naturally resists rotation.
This fail-safe collet lock provides a massive 8600 N static holding force with no live air required. If air pressure drops or an E-stop trips, the rod is securely clamped at position. The lock engages only after the rod stops and releases via a dedicated G1/8 port when piston sides are pressure-balanced, requiring at least 0.5 seconds. The -S suffix indicates a built-in magnet for CMSE reed or DMSE electronic sensors.
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 BSED125X75S 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 BSED125X75S Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X75S |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 75 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 BSED125X75S
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×75 | 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 BSED125X75S Is Used
Heavy Machining Fixtures
Clamps large castings with 8028 N of equal both-way force while the 8600 N rod lock holds the heavy workpiece securely during machining cycles with zero air consumption.
Overhead Z-Axis Lifts
Raises and lowers heavy platens symmetrically; the fail-safe collet locks instantly on air loss to prevent gravity-driven drops up to 8600 N, protecting operators and tooling.
Large Press Ejection
Ejects heavy parts using equal push and pull force via both extending rods, engaging the 8600 N static lock to hold the ejection arm rigidly during press reloading.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X75S the Right Cylinder?
Select this 125 mm bore cylinder when your application demands both-way symmetric thrust up to 819 kgf and heavy fail-safe holding up to 8600 N. If your load requires less force, stepping down to the 100 mm bore provides 3681 N at 0.5 MPa and a 5500 N holding capacity. As the largest standard size, there is no larger neighbour, so exceeding 8600 N requires a custom solution. Always verify your load is strictly within the 8600 N static limit and use safety-rated controls for man-rated or overhead loads.
For exact replacement matching, confirm the 75 mm stroke, PT1/2 cylinder port, M27x2 rod thread, and your preferred mounting from the reduced set (Basic, LB, FA, TC). Because the lock is a static clamp, not a dynamic brake, ensure the rod has fully stopped before engaging it. At 75 mm stroke, side-load risks are minimal, but always guide the tooling to prevent binding.
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 BSED125X75S FAQ
The double-rod drive force is equal both ways: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa (max 819 kgf). The integrated spring-applied rod lock provides a separate bidirectional static holding force of 8600 N with no live air.
The lock is a static clamp, not a dynamic brake. Engage it only after the rod stops moving. To release, apply air to the dedicated G1/8 release port only after both piston sides are pressure-balanced, allowing at least 0.5 seconds for the collet to open.
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