This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X45, 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 SI125X45
The AirTAC Airtac SI125 Standard Cylinder SI125X45 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 45mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X45, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X45
- 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 SI125X45
The AirTAC SI125X45 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 45 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X45, matching the bore, stroke, force, port and mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This no-magnet SKU cannot take a sensor, though legacy SI -S versions used CS1-B/DS1-B switches. For high heat, Viton H seals raise the range to 150 C.
Airtac SI125 Standard Cylinder SI125X45 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X45 |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAI125X45 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 SAI125X45 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 SI125X45
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×45 | 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 SI125X45 Is Used
Heavy Press Operations
Ideal for applying high clamping forces in metal forming and press setups where a short, powerful 6136 N stroke is required.
Pallet Stopper Arms
Acts as a robust stopper block in high-mass conveyor lines, easily halting loaded pallets using its substantial 125 mm bore capacity.
Industrial Mold Clamping
Secures heavy injection molds or industrial fixtures firmly in place during manufacturing cycles using its 5734 N pull force.
Replacing the Airtac SI125 Standard Cylinder SI125X45 with the SAI125X45
To replace this SI125X45, order the SAI125X45. Confirm the ISO 15552 mounting interface, 45 mm stroke, M27x2 rod thread and G1/2 port (PT/G/NPT). Because this SKU lacks a magnet, it cannot accept a sensor; order a -S SAI variant if position feedback is needed. At 0.5 MPa it yields 6136 N push and 5734 N pull. If undersizing, a 100 mm bore gives 3927 N push; if oversizing, a 160 mm bore offers 10053 N. The cushion only decelerates; it does not hold load on air loss. For secure holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X45
- ✓ 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 SI125X45 FAQ
Yes, the AirTAC SI125X45 is discontinued. The direct replacement is the SAI125X45. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the same 125 mm bore, 45 mm stroke, output force, G1/2 port and mounting accessories.
The SI125X45 (and its SAI125X45 replacement) operates at 30-500 mm/s. At 0.5 MPa it provides 6136 N push and 5734 N pull. At 0.7 MPa push is 8590 N, at 0.9 MPa it is 11045 N, and the theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X45 replacement — usually within 7-8 hours.