Airtac BSED Clamping Double Acting Cylinder BSED125X300
The AirTAC Airtac BSED Clamping Double Acting Cylinder BSED125X300 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, 300mm stroke, PT1/2 ports, G1/8 lock-release.
- BoreØ125 mm
- Stroke300 mm
- Static holding force8600 N
- ConfigurationDouble rod + lock
- Cylinder portPT1/2
- Lock-release portG1/8
About the Airtac BSED Clamping Double Acting Cylinder BSED125X300
The AirTAC BSED125X300 is a double-acting, double-rod ISO 15552 profile cylinder with an integrated spring-applied, air-released rod lock. Because the annulus area is identical on both sides, it delivers an equal drive force of 5734 N each way at 0.5 MPa. A rod exits both ends, allowing rear-side tooling or a flag while resisting rotation.
The fail-safe collet clamps the 32 mm rod bidirectionally, providing an 8600 N static holding force with zero live air. Operating pressure is capped at 0.7 MPa, and the lock uses a separate G1/8 release port. This unit lacks a magnet, so position sensing is not supported on this specific SKU.
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 BSED125X300 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 BSED125X300 Technical Specifications
| Model | Airtac BSED Clamping Double Acting Cylinder BSED125X300 |
|---|---|
| Series | BSED ISO 15552 double-rod rod-lock cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 BSED125X300
| B | Rod-lock cylinder prefix. |
|---|---|
| SED | ISO 15552 double-rod double-acting body. |
| 125 | Bore size in mm. |
| ×300 | 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 BSED125X300 Is Used
Heavy Machining Fixtures
Holds heavy machining fixtures securely with 8600 N of fail-safe clamping force during air loss, while providing 8028 N of equal both-way thrust for precise tool positioning.
Overhead Z-Axis Lifts
Prevents heavy vertical loads from dropping via the spring-applied collet, utilizing the double-rod design for stable up and down movement without rotational drift.
Large Press Ejection
Manages large press ejection cycles using symmetric 5734 N drive force at 0.5 MPa, locking instantly in place when the E-stop is tripped to halt mid-stroke.
Is the Airtac BSED Clamping Double Acting Cylinder BSED125X300 the Right Cylinder?
Select this 125 mm bore when you need both-way symmetric thrust up to 8028 N at 0.7 MPa and a robust 8600 N fail-safe hold. If your load requires less force, the adjacent 100 mm bore provides 3681 N at 0.5 MPa with a 5500 N holding force. If you need more holding capacity, this 125 mm bore is the largest available in the range. Ensure your actual load does not exceed the 8600 N static limit.
Always engage the lock only after the rod completely stops, and release it only when both piston sides are pressure-balanced, allowing at least 0.5 seconds for the transition. At 300 mm stroke, use external guide rails to prevent side-load wear on the seals. Replacement requires matching the 125 mm bore, 300 mm stroke, PT1/2 port, and mounting option.
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 BSED125X300 FAQ
The integrated spring-applied collet engages automatically, clamping the 32 mm rod with an 8600 N static holding force to keep the load in place. It is a fail-safe static lock, not a dynamic brake, so it must only be engaged after the rod stops moving.
The double-rod design provides equal force both directions: 5734 N at 0.5 MPa and 8028 N at 0.7 MPa, with a maximum drive of 819 kgf. The static holding force of the lock is 8600 N. The operating speed range is 30-500 mm/s, and operating pressure is capped at 0.7 MPa.
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