This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X35CA, 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 SI125X35CA
The AirTAC Airtac SI125 Standard Cylinder SI125X35CA is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 35mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X35CA, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X35CA
- 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 SI125X35CA
The AirTAC SI125X35CA is a discontinued double-acting ISO 15552 profile cylinder delivering 6136 N push force at 0.5 MPa. It features a 125mm bore, 35mm stroke, G1/2 port, and CA clevis mount. AirTAC replaced this legacy unit with the SAI125X35CA.
The SAI direct maintains identical ISO 15552 mounting, stroke, and force, but upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure. Since this SKU lacks a magnet (-S), it cannot accept CS1-B/DS1-B sensors. For high heat, Viton H seals raise limits to 150 C.
Airtac SI125 Standard Cylinder SI125X35CA Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X35CA |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X35CA |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAI125X35CA 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 SAI125X35CA 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 SI125X35CA
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SI125X35CA Is Used
Heavy Stamp Pressing
Drives large stamping dies requiring substantial thrust, utilizing the 6136 N push force at 0.5 MPa to form thick metal blanks securely.
Automotive Body Clamping
Actuates heavy-duty clamps on automotive welding lines, where the robust 32mm rod and CA clevis mount handle substantial mechanical side loads.
Pallet Lift Gates
Controls heavy material lift gates, providing reliable vertical movement for industrial logistics and loading dock operations.
Replacing the Airtac SI125 Standard Cylinder SI125X35CA with the SAI125X35CA
To replace the SI125X35CA, order the SAI125X35CA. Verify the CA clevis mount, 125mm bore, 35mm stroke, G1/2 port, and PT/G/NPT thread. This non-magnetic SKU cannot take a sensor; order an -S variant if CS1-B/DS1-B switches are needed. At 0.5 MPa it yields 6136 N push and 5734 N pull; if undersized, the 160mm bore offers 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X35CA
- ✓ 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 SI125X35CA FAQ
Yes, the SI125X35CA is discontinued. The direct replacement is the AirTAC SAI125X35CA. It shares the identical ISO 15552 mounting interface, 125mm bore, 35mm stroke, G1/2 port, and CA clevis, fitting existing fixtures perfectly while upgrading the piston seal.
This double-acting cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed of 30-500 mm/s. 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 max of 1251 kgf at 1.0 MPa. It uses a G1/2 port and 40mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X35CA
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X35CA replacement — usually within 7-8 hours.