This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X55SCA, 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 SI125X55SCA
The AirTAC SI125 Standard Cylinder SI125X55SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 55mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X55SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X55SCA
- 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 SI125X55SCA
The AirTAC SI125X55SCA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore, 55 mm stroke, and CA clevis mount. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X55SCA, a direct sharing the same interface, force, and stroke.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants absent in the SI line.
Airtac SI125 Standard Cylinder SI125X55SCA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X55SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X55SCA |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAI125X55SCA 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 SAI125X55SCA 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 SI125X55SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SI125X55SCA Is Used
Heavy Stamping Press
Drives heavy tooling blanks in automated stamping lines, utilizing the 6136 N push force to form thick gauge materials reliably.
Automated Clamp Station
Secures large fabricated steel frames during robotic welding, using the CA clevis mount to accommodate angular alignment shifts.
Pallet Dispenser
Pushes empty pallets into high-speed packaging conveyors, where the 30-500 mm/s speed range ensures smooth, controlled actuation.
Replacing the Airtac SI125 Standard Cylinder SI125X55SCA with the SAI125X55SCA
To replace the SI125X55SCA, order the SAI125X55SCA. It drops into existing fixtures via the ISO 15552 mounting interface, keeping the 125 mm bore, 55 mm stroke, G1/2 port, M27x2 rod thread, and CA clevis. Retain your CS1-B/DS1-B sensors using the -S magnet. If you need more force, the 160 mm bore yields 10053 N push at 0.5 MPa; if less is required, the 100 mm bore provides 3927 N. Note that a plain cylinder drifts without live air—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or use an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X55SCA
- ✓ 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 SI125X55SCA FAQ
Yes, the SI125X55SCA is discontinued. The direct replacement is the SAI125X55SCA. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 55 mm stroke, G1/2 port, and CA mounting interface.
The bore is 125 mm with a G1/2 air port. At 0.5 MPa it pushes 6136 N and pulls 5734 N. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X55SCA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X55SCA replacement — usually within 7-8 hours.