This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1050S, 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 SI125X1050S
The AirTAC SI125 Standard Cylinder SI125X1050S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1050mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1050S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1050 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1050S
- 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 SI125X1050S
The AirTAC SI125X1050S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1050 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X1050S, retaining the exact ISO 15552 mounting interface, bore, stroke, force, and port size for existing fixtures.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S suffix means a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. SAIL lock and BSAI clamp-lock variants are available if needed.
Airtac SI125 Standard Cylinder SI125X1050S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1050S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1050S |
| Bore size | Ø125 mm |
| Stroke | 1050 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 SAI125X1050S 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 SAI125X1050S 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 SI125X1050S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1050 | 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 SI125X1050S Is Used
Heavy Stamping Press
Drives large platens and heavy tooling where the 6136 N push force at 0.5 MPa is required for deep draw or forming operations.
Pallet Lift Gate
Raises and lowers loaded pallets over the 1050 mm travel; external guides are essential here to prevent rod bending under the 313 kg vertical load margin.
Bulk Material Diverter
Actuates large heavy-duty flow gates on aggregate or grain conveyors, utilizing the 30-500 mm/s speed range for reliable shifting.
Replacing the Airtac SI125 Standard Cylinder SI125X1050S with the SAI125X1050S
To replace the SI125X1050S, order the SAI125X1050S. Confirm the ISO 15552 mounting interface (LB, FA, CA, TC, etc.), the G1/2 port thread (PT/G/NPT), and the -S magnet. A plain cylinder drifts on air loss because cushions only decelerate; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For this 1050 mm stroke, add external guides to prevent rod bending and side-load damage. Sizing both ways: the 125 mm bore gives 6136 N push @0.5 MPa; if less force is needed, an 80 mm bore provides 2513 N, while a 160 mm bore offers 10053 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1050S
- ✓ 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 SI125X1050S FAQ
Yes, the SI125X1050S is discontinued. The direct replacement is the SAI125X1050S. It is dimensionally interchangeable per ISO 15552, matching the 125 mm bore, 1050 mm stroke, 6136 N force, G1/2 port, and mounting accessories.
The G1/2 port bore delivers a push of 6136 N and pull of 5734 N at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1050S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1050S replacement — usually within 7-8 hours.