This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X500CA, 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 SI125X500CA
The AirTAC Airtac SI125 Standard Cylinder SI125X500CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X500CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X500CA
- 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 SI125X500CA
The AirTAC SI125X500CA is a discontinued double-acting ISO 15552 profile cylinder with a CA clevis mount, delivering 6136 N push force at 0.5 MPa. Because this legacy unit lacks the -S magnet, it cannot accept a position sensor. AirTAC replaced it with the SAI125X500CA, a direct sharing the exact 125 mm bore, 500 mm stroke, G1/2 port, and CA mounting interface.
The SAI upgrade introduces 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 the SI lacked. If high heat is involved, specify the Viton H seal option (0-150 C).
Airtac SI125 Standard Cylinder SI125X500CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X500CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X500CA |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAI125X500CA 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 SAI125X500CA 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 SI125X500CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SI125X500CA Is Used
Heavy Press Clamping
Secures large metal castings during machining, using the 6136 N push force to hold components firmly under the tool head.
Mold Ejection Systems
Drives the ejection of dense industrial molds from hydraulic presses, relying on the robust 32 mm rod and CA clevis for articulation.
Replacing the Airtac SI125 Standard Cylinder SI125X500CA with the SAI125X500CA
To replace the SI125X500CA, order the SAI125X500CA and verify the ISO 15552 CA clevis mount, G1/2 port, and 500 mm stroke. Since this SKU has no -S magnet, it cannot support sensing; if switches are needed, select an SAI125X500CA-S and use current AirTAC sensors. For sizing, the 125 mm bore yields 6136 N push at 0.5 MPa; if less force is acceptable, a 100 mm bore provides 3927 N. Because the 500 mm stroke is long, use an external guide to prevent rod bending and side-load damage. Note that 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 variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X500CA
- ✓ 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 SI125X500CA FAQ
Yes, the SI125X500CA is discontinued. The direct replacement is the SAI125X500CA. It shares the identical ISO 15552 mounting interface, 125 mm bore, 500 mm stroke, output force, G1/2 port, and CA clevis mount, fitting directly into existing fixtures.
This double-acting cylinder features a G1/2 air 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 maximum of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X500CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X500CA replacement — usually within 7-8 hours.