This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X25CA, 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 SI125X25CA
The AirTAC SI125 Standard Cylinder SI125X25CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 25mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X25CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke25 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X25CA
- 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 SI125X25CA
The AirTAC SI125X25CA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 25 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X25CA, which matches the original CA clevis mounting, M27x2 rod thread, and 40 mm cushions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. Note this SKU lacks a magnet (-S) and cannot take a sensor; legacy CS1-B/DS1-B switches only fit magnetized variants. For load holding, explore the SAIL or BSAI lock variants.
Airtac SI125 Standard Cylinder SI125X25CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X25CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X25CA |
| Bore size | Ø125 mm |
| Stroke | 25 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 SAI125X25CA 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 SAI125X25CA 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 SI125X25CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×25 | 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 SI125X25CA Is Used
Heavy Stamping Press
Drives high-tonnage stamping actuators where the 6136 N push force at 0.5 MPa is required to form thick plate metal.
Mold Clamping Station
Secures heavy injection molds using the CA clevis mount, utilizing the short 25 mm stroke for rapid, rigid locking.
Replacing the Airtac SI125 Standard Cylinder SI125X25CA with the SAI125X25CA
To replace the SI125X25CA, order the SAI125X25CA. Confirm the ISO 15552 interface, 125 mm bore, 25 mm stroke, G1/2 port (PT/G/NPT thread options), and CA clevis mounting. Since this SKU lacks a magnet, it cannot accept position sensors; if sensing is needed, specify an SAI model with the S suffix. The 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa). If sizing down, an 80 mm bore gives 2513 N at 0.5 MPa. The air cushion only decelerates the load; it does not hold position. For secure load holding without live air, use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X25CA
- ✓ 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 SI125X25CA FAQ
Yes, the SI125X25CA is discontinued. The direct replacement is the AirTAC SAI125X25CA. It features the same ISO 15552 mounting interface, 125 mm bore, 25 mm stroke, output force, G1/2 port, and CA clevis mounting, fitting directly into existing fixtures.
The 125 mm bore uses a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 N pull force. 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 SAI125X25CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X25CA replacement — usually within 7-8 hours.