This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X180STC, 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 SI125X180STC
The AirTAC SI125 Standard Cylinder SI125X180STC 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 SAI125X180STC, 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 → SAI125X180STC
- 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 SI125X180STC
The AirTAC SI125X180STC 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. The direct replacement is the SAI125X180STC, retaining the identical TC trunnion mount, G1/2 port, and M27x2 rod thread.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X180STC Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X180STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X180STC |
| 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 SAI125X180STC 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 SAI125X180STC 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 SI125X180STC
| 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 SI125X180STC Is Used
Heavy Pressing
Applies 6136 N at 0.5 MPa for seating heavy components or forming operations on automated lines.
Pallet Handling
Drives robust 180 mm stroke lifts and pushes in high-capacity logistics conveyors with TC trunnion mounts.
Clamping Fixtures
Secures large workpieces in machining cells where the 125 mm bore provides stable, high-force clamping.
Replacing the Airtac SI125 Standard Cylinder SI125X180STC with the SAI125X180STC
To replace the SI125X180STC, order the SAI125X180STC. Confirm the ISO 15552 TC trunnion interface, 125 mm bore, 180 mm stroke, G1/2 port, and the -S magnet for CS1-B/DS1-B switches. Sizing both ways: a 100 mm bore yields 3927 N [email protected], while a 160 mm bore yields 10053 N. Note that 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. At 180 mm, side-load risk is low, but ensure alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X180STC
- ✓ 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 SI125X180STC FAQ
Yes, the SI125X180STC is discontinued. The direct replacement is the SAI125X180STC. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, force, G1/2 port, and TC mounting interface.
It features a G1/2 port. Force output is 6136 N push and 5734 N pull at 0.5 MPa, 8590 N push at 0.7 MPa, 11045 N 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 SAI125X180STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X180STC replacement — usually within 7-8 hours.