This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X40CA, 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 SI125X40CA
The AirTAC Airtac SI125 Standard Cylinder SI125X40CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 40mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X40CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X40CA
- 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 SI125X40CA
The AirTAC SI125X40CA is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 40 mm stroke, delivering 6136 N push force at 0.5 MPa. It features a CA clevis mount and a G1/2 port. Because this legacy SI unit is end-of-life, you should order the SAI125X40CA direct replacement.
The SAI125X40CA shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories, fitting existing fixtures perfectly. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. Note this SKU lacks a magnet, so it cannot accept a CS1-B or DS1-B sensor.
Airtac SI125 Standard Cylinder SI125X40CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X40CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X40CA |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAI125X40CA 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 SAI125X40CA 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 SI125X40CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SI125X40CA Is Used
Heavy Stamping
Drives heavy-duty stamping presses requiring 6136 N push force at 0.5 MPa with robust CA clevis mounting.
Automotive Welding
Actuates large welding fixtures, utilizing the 125 mm bore and G1/2 port for high-throughput lines.
Replacing the Airtac SI125 Standard Cylinder SI125X40CA with the SAI125X40CA
To replace the SI125X40CA, order the SAI125X40CA and confirm the ISO 15552 CA clevis mounting, 125 mm bore, 40 mm stroke, and G1/2 port. This SKU has no -S magnet, so it cannot support position sensing; if sensing is needed, select an SAI variant with a magnet. If sizing down, the 100 mm bore yields 3927 N push at 0.5 MPa; sizing up to 160 mm provides 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X40CA
- ✓ 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 SI125X40CA FAQ
Yes, the AirTAC SI125X40CA is discontinued. The direct replacement is the SAI125X40CA, which shares the same ISO 15552 mounting interface, 125 mm bore, 40 mm stroke, force, G1/2 port and CA clevis mount.
The 125 mm bore uses a G1/2 port. It delivers 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 max of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X40CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X40CA replacement — usually within 7-8 hours.