This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X570S, 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 SI125X570S
The AirTAC SI125 Standard Cylinder SI125X570S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 570mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X570S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke570 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X570S
- 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 SI125X570S
The AirTAC SI125X570S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore, 570 mm stroke, G1/2 port, and M27x2 rod thread. Delivering 6136 N push force at 0.5 MPa, it includes a piston magnet for CS1-B/DS1-B sensors.
The direct replacement is the SAI125X570S, matching the ISO 15552 mounting interface, bore, stroke, force, and port. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure. For load holding, use the SAIL lock or BSAI clamp-lock variants, as cushions only decelerate.
Airtac SI125 Standard Cylinder SI125X570S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X570S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X570S |
| Bore size | Ø125 mm |
| Stroke | 570 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 SAI125X570S 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 SAI125X570S 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 SI125X570S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×570 | 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 SI125X570S Is Used
Heavy Material Lifts
Drives large platform elevators and heavy pallet lifts using its 6136 N push force at 0.5 MPa, safely moving loads around 3682 N.
Large Press Ejection
Ejects formed metal or composite parts from heavy industrial presses, utilizing the 570 mm stroke to clear the die area completely.
Automated Storage Retrieval
Actuates multi-level automated storage and retrieval systems, where the integrated magnet enables precise position feedback.
Replacing the Airtac SI125 Standard Cylinder SI125X570S with the SAI125X570S
To replace the SI125X570S, order the SAI125X570S. Verify the ISO 15552 mounting interface, 125 mm bore, 570 mm stroke, G1/2 port, and the -S magnet for current AirTAC switches. Operating speed is 30-500 mm/s. At 0.5 MPa it yields 6136 N push and 5734 N pull; neighboring bores offer 3927 N (100mm) or 10053 N (160mm). For this 570 mm stroke, use external guides to prevent rod bending and side loads. The air cushion (40 mm) only decelerates; for load holding on air loss, select the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X570S
- ✓ 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 SI125X570S FAQ
Yes, the SI125X570S is discontinued. The direct replacement is the SAI125X570S. It matches the ISO 15552 mounting interface, 125 mm bore, 570 mm stroke, output force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port bore provides 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 maximum theoretical force of 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X570S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X570S replacement — usually within 7-8 hours.