This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X600SLB, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI125 Standard Cylinder SI125X600SLB
The AirTAC SI125 Standard Cylinder SI125X600SLB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 600mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X600SLB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke600 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X600SLB
- 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 SI125 Standard Cylinder SI125X600SLB
The AirTAC SI125X600SLB is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 600 mm stroke, delivering 6136 N push force at 0.5 MPa. It is directly replaced by the SAI125X600SLB, a direct sharing the same G1/2 port, M27x2 rod thread, and LB foot mounting interface.
The SAI upgrade features a revised piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. With a 600 mm stroke, use external guides to prevent rod bending under side loads. The S family adds variants the SI lacked, like the SAIL lock and BSAI clamp-lock.
Airtac SI125 Standard Cylinder SI125X600SLB Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X600SLB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X600SLB |
| Bore size | Ø125 mm |
| Stroke | 600 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI125X600SLB carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
The SAI125X600SLB produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI125 Standard Cylinder SI125X600SLB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×600 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI125 Standard Cylinder SI125X600SLB Is Used
Heavy Material Transfer
Drives large pallets or heavy fixtures over 600 mm cycles where 6136 N at 0.5 MPa provides ample push force for automated conveying.
Pallet Positioning
Shifts loaded pallets into wrapping or strapping stations using the LB foot mount to handle the 313 kg vertical lift capacity safely.
Large Press Ejection
Ejects formed parts from heavy machinery, utilizing the 40 mm adjustable air cushions to decelerate the 32 mm rod at stroke ends.
Replacing the Airtac SI125 Standard Cylinder SI125X600SLB with the SAI125X600SLB
To replace the SI125X600SLB, order the SAI125X600SLB. It drops into existing fixtures via the identical ISO 15552 LB foot mount, 125 mm bore, 600 mm stroke, G1/2 port, and M27x2 thread. The -S magnet works with legacy CS1-B/DS1-B sensors, though the SAI accepts current AirTAC switches. If you need more force, the neighboring 160 mm bore offers 10053 N at 0.5 MPa; if less is needed, the 100 mm bore provides 3927 N. For this 600 mm stroke, external guides are recommended to manage side-load and rod-bending risks. A plain cylinder drifts without air; for load holding on air loss, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X600SLB
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI125 Standard Cylinder SI125X600SLB FAQ
Yes, the SI125X600SLB is discontinued. The direct replacement is the SAI125X600SLB. It shares the same ISO 15552 mounting interface, 125 mm bore, 600 mm stroke, G1/2 port, and LB mount, fitting existing fixtures perfectly.
The 125 mm bore uses a G1/2 port. It generates 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X600SLB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X600SLB replacement — usually within 7-8 hours.