This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X36, 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 SI125X36
The AirTAC SI125 Standard Cylinder SI125X36 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 36mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X36, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke36 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X36
- 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 SI125X36
The AirTAC SI125X36 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 36 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X36, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, and output force.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For load holding, note that a plain cylinder drifts without live air; the cushion only decelerates. Use the SAIL or BSAI lock variants if needed. This non-magnet SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X36 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X36 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X36 |
| Bore size | Ø125 mm |
| Stroke | 36 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 SAI125X36 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 SAI125X36 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 SI125X36
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×36 | 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 SI125X36 Is Used
Heavy Stamping Press
Provides the robust 6136 N push force needed to actuate heavy-duty stamping and forming presses.
Pallet Positioning
Short 36 mm stroke precisely indexes loaded pallets or heavy fixtures at conveyor transfer points.
Industrial Clamp
Secures large fabricated components during machining or welding operations requiring high clamping force.
Replacing the Airtac SI125 Standard Cylinder SI125X36 with the SAI125X36
To replace the SI125X36, order the SAI125X36. Verify your ISO 15552 mounting interface, M27x2 rod thread, and G1/2 port. Because this specific SKU lacks the -S magnet, it cannot accept position sensors; if you require sensing, select an SAI125X36S and use current AirTAC switches. Sizing both ways: this 125 mm bore yields 6136 N at 0.5 MPa, while a smaller 100 mm bore yields 3927 N. For load holding on air loss, the cushion only decelerates; add an external pilot check valve or choose the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X36
- ✓ 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 SI125X36 FAQ
Yes, the AirTAC SI125X36 is discontinued. The direct replacement is the SAI125X36. It is a true ISO 15552 profile cylinder that matches the original bore, stroke, force, G1/2 port, and mounting dimensions, fitting directly into existing fixtures.
The G1/2 port bore delivers a push force of 6136 N and pull of 5734 N at 0.5 MPa. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical max is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X36
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X36 replacement — usually within 7-8 hours.