This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X112, 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 SI125X112
The AirTAC SI125 Standard Cylinder SI125X112 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 112mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X112, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke112 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X112
- 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 SI125X112
The AirTAC SI125X112 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 112 mm stroke, delivering 6136 N push force at 0.5 MPa through its G1/2 port. AirTAC replaced this legacy unit with the SAI125X112, a direct upgrade retaining the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI125X112 features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S) and cannot accept a CS1-B/DS1-B sensor; for load holding on air loss, explore the SAIL or BSAI lock variants instead of relying on the 40 mm air cushions.
Airtac SI125 Standard Cylinder SI125X112 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X112 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X112 |
| Bore size | Ø125 mm |
| Stroke | 112 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 SAI125X112 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 SAI125X112 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 SI125X112
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×112 | 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 SI125X112 Is Used
Heavy-Duty Pressing
Drives large stamping or forming fixtures requiring up to 8590 N of thrust at 0.7 MPa, utilizing the 32 mm rod for rigidity.
Large Clamp Actuation
Secures heavy workpieces in machining cells, providing 5734 N of pull force at 0.5 MPa to hold components firmly in place.
Replacing the Airtac SI125 Standard Cylinder SI125X112 with the SAI125X112
To replace the SI125X112, order the SAI125X112 direct equivalent, confirming the ISO 15552 mounting interface, 112 mm stroke, G1/2 port (PT/G/NPT thread), and M27x2 rod thread. Because this legacy SKU has no -S magnet, it cannot support position sensing; if switches are needed, specify a magnet on the new SAI order for current AirTAC sensors. Sizing both ways: the 125 mm bore yields 6136 N push at 0.5 MPa (8590 N at 0.7 MPa), while the neighbouring 100 mm bore offers 3927 N at 0.5 MPa. For any load holding during air loss, remember the 40 mm adjustable cushions only decelerate near stroke end; add an external pilot check valve, rod lock, or specify the SAIL or BSAI lock variant. The operating speed is 30-500 mm/s.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X112
- ✓ 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 SI125X112 FAQ
Yes, the SI125X112 is discontinued. The direct replacement is the AirTAC SAI125X112. It is a true ISO 15552 dimensionally interchangeable upgrade, maintaining the same 125 mm bore, 112 mm stroke, output force, G1/2 port, and mounting interface, so it fits existing fixtures perfectly.
This double-acting cylinder features a G1/2 air port and an M27x2 rod thread. The 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 maximum of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X112
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X112 replacement — usually within 7-8 hours.