This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X262S, 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 SI125X262S
The AirTAC SI125 Standard Cylinder SI125X262S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 262mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X262S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke262 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X262S
- 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 SI125X262S
The AirTAC SI125X262S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 262 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. As a nonstandard stroke, it requires exact replication. The direct replacement is the SAI125X262S, matching the ISO 15552 mounting interface, bore, output force, and accessories exactly.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The original SI utilized CS1-B/DS1-B legacy sensors, while the SAI family supports current AirTAC switches.
Airtac SI125 Standard Cylinder SI125X262S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X262S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X262S |
| Bore size | Ø125 mm |
| Stroke | 262 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 SAI125X262S 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 SAI125X262S 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 SI125X262S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×262 | 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 SI125X262S Is Used
Heavy Pressing
Applies 6136 N of thrust at 0.5 MPa for seating heavy components and actuating large industrial presses.
Pallet Handling
Drives robust 262 mm stroke lifting mechanisms in automated palletizing lines and material transfer stations.
Mold Clamping
Secures large injection molds or heavy fixtures using the 125 mm bore class and M27x2 rod end threads.
Replacing the Airtac SI125 Standard Cylinder SI125X262S with the SAI125X262S
To replace the SI125X262S, order the SAI125X262S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 air port, and the M27x2 rod thread. The -S suffix indicates a piston magnet for CS1-B/DS1-B switches; the SAI equivalent accommodates current AirTAC sensors. When sizing, a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that 262 mm is a nonstandard stroke. Because the stroke exceeds 300 mm is not met here, but always ensure adequate guide support to prevent rod bending under side loads. A plain SAI does not hold load without live air; for load holding on air loss, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X262S
- ✓ 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 SI125X262S FAQ
Yes, the SI125X262S is discontinued. The direct replacement is the SAI125X262S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 262 mm stroke, G1/2 port, and mounting interface.
The cylinder features a G1/2 air port. Force ratings are 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N push at 0.9 MPa, and a theoretical maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X262S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X262S replacement — usually within 7-8 hours.