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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
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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Standard models are processed and dispatched in 3-5 business days.
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