This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1500TC, 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 SI125X1500TC
The AirTAC SI125 Standard Cylinder SI125X1500TC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1500TC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1500TC
- 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 SI125X1500TC
The AirTAC SI125X1500TC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1500 mm stroke. Delivering 6136 N push force at 0.5 MPa via a G1/2 port, it is replaced by the SAI125X1500TC. This direct successor matches the TC trunnion mount, bore, stroke, force, and ISO 15552 interface exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants the SI lacked. Note this non-magnetic SKU cannot take a sensor.
Airtac SI125 Standard Cylinder SI125X1500TC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1500TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1500TC |
| Bore size | Ø125 mm |
| Stroke | 1500 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 SAI125X1500TC 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 SAI125X1500TC 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 SI125X1500TC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1500 | 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 SI125X1500TC Is Used
Long-Stroke Material Pusher
Transfers heavy workpieces across 1.5-meter conveyor gaps using 6136 N of thrust at 0.5 MPa, relying on external guides to prevent rod bending.
Pallet Positioning Actuator
Indexes large pallets into staging zones via the ISO 15552 TC trunnion mount, absorbing end-of-stroke kinetic energy with 40 mm adjustable cushions.
Replacing the Airtac SI125 Standard Cylinder SI125X1500TC with the SAI125X1500TC
To replace the SI125X1500TC, order the SAI125X1500TC to retain the exact 125 mm bore, 1500 mm stroke, G1/2 port, M27x2 thread, and TC trunnion mounting interface. When sizing, neighboring bores offer different force classes: a 100 mm bore yields 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. At 0.7 MPa this 125 mm bore outputs 8590 N. Because this is a non-magnetic SKU, it cannot accept CS1-B/DS1-B sensors. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Finally, at 1500 mm, prevent rod bending and side-load damage with external guide rails.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1500TC
- ✓ 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 SI125X1500TC FAQ
Yes, the SI125X1500TC is discontinued. The direct replacement is the SAI125X1500TC. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 1500 mm stroke, G1/2 port, TC mounting, and output force, but adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure.
The 125 mm bore features a G1/2 air port and a 32 mm rod. It generates 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 force of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1500TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1500TC replacement — usually within 7-8 hours.