This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X170, 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 SI125X170
The AirTAC SI125 Standard Cylinder SI125X170 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 SAI125X170, 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 → SAI125X170
- 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 SI125X170
The AirTAC SI125X170 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 170 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X170, which shares the exact same G1/2 port, M27x2 rod thread, and ISO 15552 mounting interface for a seamless fixture swap.
This SKU lacks a magnet (-S) and cannot accept a position sensor. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and adds SAIL or BSAI lock variants the SI lacked.
Airtac SI125 Standard Cylinder SI125X170 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X170 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X170 |
| 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 SAI125X170 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 SAI125X170 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 SI125X170
| 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 SI125X170 Is Used
Heavy Pressing
Drives large stamping or forming presses requiring substantial thrust, utilizing the 6136 N output at 0.5 MPa.
Pallet Handling
Actuates heavy-duty lift gates and diverters in automated storage systems where high force and rigidity are mandatory.
Mold Clamping
Secures large injection molds or heavy industrial fixtures, relying on the 32 mm rod to resist deflection.
Replacing the Airtac SI125 Standard Cylinder SI125X170 with the SAI125X170
To replace the SI125X170, order the SAI125X170 and verify your ISO 15552 mounting interface, 170 mm stroke, and G1/2 port. This non-magnetic SKU cannot take a sensor; if you need position feedback, select an SAI equivalent with a magnet. For sizing, the 125 mm bore yields 6136 N at 0.5 MPa, while the neighboring 100 mm bore offers 3927 N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. With a 170 mm stroke, side-load is minimal, but always ensure rigid guidance to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X170
- ✓ 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 SI125X170 FAQ
Yes, the SI125X170 is discontinued. The direct replacement is the SAI125X170. 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. It delivers 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. It operates at 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X170
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X170 replacement — usually within 7-8 hours.