This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X170S, 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 SI125X170S
The AirTAC SI125 Standard Cylinder SI125X170S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 170mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X170S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke170 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X170S
- 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 SI125X170S
The AirTAC SI125X170S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 170 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X170S, matching the exact bore, stroke, force, port and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The original SI line lacked lock variants, but the SAI family adds SAIL and BSAI clamp options. The -S suffix means a piston magnet for CS1-B/DS1-B sensors; the SAI uses current switches.
Airtac SI125 Standard Cylinder SI125X170S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X170S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X170S |
| Bore size | Ø125 mm |
| Stroke | 170 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 SAI125X170S 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 SAI125X170S 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 SI125X170S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×170 | 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 SI125X170S Is Used
Heavy Stamping Press
Drives large platens and heavy dies requiring high thrust, using the 125 mm bore to deliver robust actuation under demanding industrial loads.
Pallet Handling
Indexes loaded pallets along conveyor lines, utilizing the 170 mm stroke to push heavy goods smoothly into staging areas.
Automated Clamping
Secures large fabricated components during machining or welding operations, providing reliable holding force throughout the cycle.
Replacing the Airtac SI125 Standard Cylinder SI125X170S with the SAI125X170S
To replace the SI125X170S, order the SAI125X170S. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the 170 mm stroke, G1/2 port, and the -S magnet requirement. Sizing checks: the 125 mm bore yields 6136 N push at 0.5 MPa; dropping to an 80 mm bore gives 2513 N, while a 160 mm bore provides 10053 N. For strokes over 300 mm, guide side-loads to prevent rod bending. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X170S
- ✓ 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 SI125X170S FAQ
Yes, the AirTAC SI125X170S is discontinued. The direct replacement is the SAI125X170S. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 170 mm stroke, output force, G1/2 port and mounting accessories.
This double-acting cylinder features a G1/2 port. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X170S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X170S replacement — usually within 7-8 hours.