This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X75N, 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 SI125X75N
The AirTAC SI125 Standard Cylinder SI125X75N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X75N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X75N
- 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 SI125X75N
The AirTAC SI125X75N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 75 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X75N, which shares the exact ISO 15552 mounting interface, bore, stroke, and output force. This NBR-sealed unit lacks a magnet, meaning it cannot accept position switches.
Buyers gain an upgraded piston seal in the SAI (two Y-shaped one-way elements for low start-up pressure and long life). The SAI family also introduces lock and valve variants absent in the SI line, like the SAIL, SAIF, and BSAI models.
Airtac SI125 Standard Cylinder SI125X75N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X75N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X75N |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAI125X75N 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 SAI125X75N 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 SI125X75N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SI125X75N Is Used
Heavy-Duty Pressing
Ideal for applying high clamping forces in automated stamping and metal-forming fixtures where a 75 mm stroke is sufficient.
Pallet Stopper
Acts as a robust end-stop or positioning gate for heavy-loaded pallets on roller conveyors in distribution centers.
Mold Ejection
Provides the substantial push-out force needed to eject dense molded parts or heavy castings from stationary production tooling.
Replacing the Airtac SI125 Standard Cylinder SI125X75N with the SAI125X75N
To replace the SI125X75N, order the SAI125X75N. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 75 mm stroke, and the G1/2 port. Because this SKU has no -S magnet, it cannot support sensors; if sensing is needed, select an SAI model with the magnet option and use current AirTAC switches. If sizing up or down, note the 100 mm bore offers 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. A plain cylinder drifts on air loss; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X75N
- ✓ 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 SI125X75N FAQ
Yes, the SI125X75N is discontinued. The direct replacement is the AirTAC SAI125X75N. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 75 mm stroke, output force, G1/2 port, and mounting accessories.
At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. It operates at 30-500 mm/s, uses a G1/2 port, and the NBR seals support temperatures from -20 to +70 C.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X75N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X75N replacement — usually within 7-8 hours.