This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X190STC, 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 SI125X190STC
The AirTAC SI125 Standard Cylinder SI125X190STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 190mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X190STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke190 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X190STC
- 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 SI125X190STC
The AirTAC SI125X190STC is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel, a 125 mm bore, and a 190 mm stroke. Designed for heavy-duty thrust, it delivers 6136 N push force at 0.5 MPa through a G1/2 port. The direct replacement is the SAI125X190STC, which preserves the original TC trunnion mount, M27x2 rod thread, and 40 mm adjustable air cushions.
Upgrading to the SAI125X190STC introduces an advanced piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent in the SI line, and your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X190STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X190STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X190STC |
| Bore size | Ø125 mm |
| Stroke | 190 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 SAI125X190STC 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 SAI125X190STC 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 SI125X190STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×190 | 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 SI125X190STC Is Used
Heavy Press Clamping
Secures large metal castings in machining centers, utilizing the 6136 N push force to maintain rigid fixturing during high-torque milling operations.
Pallet Redirector
Handles robust load redirection on heavy-duty conveyor lines, using the TC trunnion mount to absorb high lateral moments during pallet transfers.
Mold Ejection System
Drives large injection mold ejection plates, where the 40 mm adjustable air cushions ensure smooth deceleration of substantial moving masses.
Replacing the Airtac SI125 Standard Cylinder SI125X190STC with the SAI125X190STC
To replace the SI125X190STC, order the SAI125X190STC with the identical ISO 15552 TC trunnion mounting interface, 125 mm bore, 190 mm stroke, G1/2 port, and -S magnet. When sizing, note the 6136 N push at 0.5 MPa; if you need less force, the neighboring 100 mm bore yields 3927 N, while the 160 mm bore provides 10053 N for heavier demands. Because this is a plain cylinder, it will not hold a load without live air—the cushion only decelerates. For secure holding, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. The 190 mm stroke avoids severe rod-bending side loads, but always guide the load for smooth operation.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X190STC
- ✓ 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 SI125X190STC FAQ
Yes, the SI125X190STC is discontinued. The direct replacement is the SAI125X190STC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 190 mm stroke, G1/2 port, TC mount, and output force.
This 125 mm bore cylinder features a G1/2 air port and M27x2 rod thread. The thrust ratings are 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 SAI125X190STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X190STC replacement — usually within 7-8 hours.