This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X175, 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 SI125X175
The AirTAC SI125 Standard Cylinder SI125X175 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 175mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X175, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X175
- 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 SI125X175
The AirTAC SI125X175 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 175 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. Because this legacy SKU lacks a magnet (-S), it cannot accept position sensors. The direct is the current-production SAI125X175.
The SAI125X175 maintains the exact ISO 15552 mounting interface, bore, stroke, output force, port and accessories. It upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The SAI family also introduces SAIL and BSAI lock variants absent from the SI line.
Airtac SI125 Standard Cylinder SI125X175 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X175 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X175 |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAI125X175 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 SAI125X175 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 SI125X175
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SI125X175 Is Used
Heavy-Duty Pressing
Drives large stamping and forming dies requiring up to 8590 N of thrust at 0.7 MPa within a rigid ISO 15552 fixture.
Pallet Handling
Indexes heavy loaded pallets on transfer lines where the 125 mm bore and 175 mm stroke provide the necessary push force.
Automated Clamping
Secures large workpieces in machining cells, using the robust 32 mm rod and M27x2 thread to hold components firmly.
Replacing the Airtac SI125 Standard Cylinder SI125X175 with the SAI125X175
To replace the SI125X175, order the SAI125X175. Confirm the ISO 15552 mounting fixture, 125 mm bore, 175 mm stroke, G1/2 port (PT/G/NPT thread options) and mounting accessory (LB, FA, CA, TC). This non-magnetic SKU cannot take a sensor; if you need switches, select an SAI125X175S and use current AirTAC sensors instead of the legacy CS1-B/DS1-B. Sizing both ways: a 100 mm bore gives 3927 N push at 0.5 MPa, while a 160 mm bore yields 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, specify the SAIL or BSAI lock variant, or add an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X175
- ✓ 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 SI125X175 FAQ
Yes, the SI125X175 is discontinued. The direct replacement is the SAI125X175. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 175 mm stroke, output force, G1/2 port and mounting accessories.
The G1/2 port bore 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 max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X175
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X175 replacement — usually within 7-8 hours.