This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1700STC, 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 SI125X1700STC
The AirTAC SI125 Standard Cylinder SI125X1700STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1700mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1700STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1700 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1700STC
- 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 SI125X1700STC
The AirTAC SI125X1700STC is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1700 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. Because 1700 mm exceeds the 1500 mm standard maximum, this is a non-standard, made-to-order unit requiring external guides to prevent rod bending under side loads.
AirTAC replaced the SI line with the SAI125X1700STC. This direct upgrade matches the ISO 15552 mounting interface, TC trunnion, stroke, and force, but adds an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure. The -S magnet supports legacy CS1-B/DS1-B sensors, while the SAI family introduces SAIL and BSAI lock variants absent in the SI series.
Airtac SI125 Standard Cylinder SI125X1700STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1700STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1700STC |
| Bore size | Ø125 mm |
| Stroke | 1700 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 SAI125X1700STC 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 SAI125X1700STC 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 SI125X1700STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1700 | 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 SI125X1700STC Is Used
Long-Stroke Material Transfer
Drives heavy workpieces over 1700 mm distances in automated lines, utilizing the 6136 N thrust at 0.5 MPa to push loads reliably between stations.
Large Press Ejection
Ejects formed parts from heavy presses using the 125 mm bore's robust 8590 N output at 0.7 MPa, requiring external guides to handle the long rod extension.
Pallet Positioning
Shifts loaded pallets laterally on conveyors where the 313 kg vertical lift capacity and TC trunnion mount handle substantial weight and pivot stresses.
Replacing the Airtac SI125 Standard Cylinder SI125X1700STC with the SAI125X1700STC
To replace the discontinued SI125X1700STC, order the SAI125X1700STC. Verify the ISO 15552 TC trunnion mounting, G1/2 port, M27x2 rod thread, and the -S magnet for current AirTAC switches. When sizing, neighboring bores offer different forces: the 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. Note that a plain cylinder drifts without live air; the 40 mm adjustable cushions only decelerate. For load holding, use an external rod lock, pilot check valve, or the SAI-only SAIL/BSAI lock variants. Finally, this 1700 mm stroke exceeds the 1500 mm standard, so external guides are mandatory to manage rod-bending side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1700STC
- ✓ 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 SI125X1700STC FAQ
Yes, the SI125X1700STC is discontinued. The direct replacement is the SAI125X1700STC. It shares the same ISO 15552 mounting interface, 125 mm bore, 1700 mm stroke, G1/2 port, and TC trunnion, but features an upgraded two Y-shaped element piston seal for longer life.
This double-acting cylinder operates at 0.15-1.0 MPa with a speed of 30-500 mm/s. Force outputs 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 max of 1251 kgf at 1.0 MPa. It features a 32 mm rod, M27x2 thread, and 40 mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1700STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1700STC replacement — usually within 7-8 hours.