This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X180SH, 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 SI125X180SH
The AirTAC SI125 Standard Cylinder SI125X180SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 180mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X180SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X180SH
- 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 SI125X180SH
The AirTAC SI125X180SH is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 180 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X180SH, matching the bore, stroke, force, and ISO 15552 mounting interface exactly.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This unit includes the -S magnet for CS1-B/DS1-B sensors and the -H Viton seal for 0-150 C heat.
Airtac SI125 Standard Cylinder SI125X180SH Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X180SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X180SH |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAI125X180SH 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 SAI125X180SH 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 SI125X180SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SI125X180SH Is Used
Heavy Stamping Press
Drives large heavy-duty stamping dies requiring 6136 N push force at 0.5 MPa with robust 125 mm bore stability.
High-Temperature Ejection
Ejects molded parts in hot zones using the -H Viton seal rated for 0 to 150 C continuous operation.
Replacing the Airtac SI125 Standard Cylinder SI125X180SH with the SAI125X180SH
To replace the SI125X180SH, order the SAI125X180SH. Verify the ISO 15552 mounting interface, G1/2 port, M27x2 rod thread, and 180 mm stroke. The -S magnet enables CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. The -H Viton seal handles 0-150 C. If you need more force than the 6136 N at 0.5 MPa, step up to a 160 mm bore; if less, a 100 mm bore gives 3927 N. Air cushions only decelerate; they do not hold loads. For dead-load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X180SH
- ✓ 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 SI125X180SH FAQ
Yes, the SI125X180SH is discontinued. The direct replacement is the SAI125X180SH. It shares the identical ISO 15552 mounting interface, 125 mm bore, 180 mm stroke, 6136 N force, and G1/2 port, fitting existing fixtures perfectly.
The G1/2 port feeds a 32 mm rod. Forces 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; with 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 SAI125X180SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X180SH replacement — usually within 7-8 hours.