This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X350SCA, 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 SI125X350SCA
The AirTAC SI125 Standard Cylinder SI125X350SCA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 350mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X350SCA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X350SCA
- 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 SI125X350SCA
The AirTAC SI125X350SCA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 350 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X350SCA, matching the exact CA clevis mounting, M27x2 rod thread, and output force.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. For load holding, note that a standard cylinder drifts on air loss—the cushion only decelerates; use the SAIL or BSAI lock variants if needed.
Airtac SI125 Standard Cylinder SI125X350SCA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X350SCA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X350SCA |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAI125X350SCA 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 SAI125X350SCA 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 SI125X350SCA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SI125X350SCA Is Used
Heavy Machinery Ejection
Provides the robust 6136 N thrust needed to eject heavy finished metal castings from press beds, utilizing the CA clevis for pivot articulation.
Pallet Positioning
Shifts loaded pallets along high-capacity conveyor lines, where the 350 mm stroke offers ample travel distance for sorting operations.
Automated Press Clamping
Secures large workpieces during heavy machining cycles, taking advantage of the 125 mm bore's high force output and stable profile barrel.
Replacing the Airtac SI125 Standard Cylinder SI125X350SCA with the SAI125X350SCA
To replace the SI125X350SCA, order the SAI125X350SCA. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the CA clevis mount, 125 mm bore, 350 mm stroke, G1/2 port, and -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). If sizing alternatives, neighboring bores shift force significantly: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Because this is a 350 mm stroke, external guides are recommended to prevent rod bending under side loads. Remember this double-acting cylinder will not hold a load without live air; for secure holding, select the SAIL (air-released lock) or BSAI (clamp-lock) variant, or add an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X350SCA
- ✓ 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 SI125X350SCA FAQ
Yes, the AirTAC SI125X350SCA is discontinued. The direct replacement is the SAI125X350SCA. It shares the identical ISO 15552 mounting interface, 125 mm bore, 350 mm stroke, G1/2 port, and CA clevis, fitting directly into existing fixtures.
This double-acting cylinder features a G1/2 air port and M27x2 rod thread. The force output is 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X350SCA
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