This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X282S, 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 SI125X282S
The AirTAC SI125 Standard Cylinder SI125X282S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 282mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X282S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke282 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X282S
- 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 SI125X282S
The AirTAC SI125X282S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 282 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X282S, matching the interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The SAI family adds SAIL and BSAI lock variants the SI lacked. This -S model uses CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X282S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X282S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X282S |
| Bore size | Ø125 mm |
| Stroke | 282 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 SAI125X282S 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 SAI125X282S 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 SI125X282S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×282 | 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 SI125X282S Is Used
Heavy Press Clamping
Secures large metal castings during machining, utilizing the 6136 N push force to hold components rigidly against the cutting tool.
Automated Assembly Indexing
Drives substantial payload shifts between production cells, relying on the 282 mm stroke to transfer bulky sub-assemblies safely.
Replacing the Airtac SI125 Standard Cylinder SI125X282S with the SAI125X282S
To replace this SI125X282S, order the SAI125X282S. Verify the ISO 15552 mounting interface, 282 mm stroke, G1/2 port (PT/G/NPT), and mounting accessory. The -S suffix means a magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; dropping to an 80 mm bore gives 2513 N, while increasing pressure to 0.7 MPa yields 8590 N. Note: 282 mm is a nonstandard stroke. Since the stroke is over 300 mm, prevent rod bending by guiding the load to avoid side loads. A plain cylinder drifts without air; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X282S
- ✓ 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 SI125X282S FAQ
Yes, the SI125X282S is discontinued. The direct replacement is the SAI125X282S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 282 mm stroke, G1/2 port, and mounting interface to fit existing fixtures directly.
This double-acting cylinder uses a G1/2 port. The force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X282S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X282S replacement — usually within 7-8 hours.