This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X140SN, 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 SI125X140SN
The AirTAC SI125 Standard Cylinder SI125X140SN is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 140mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X140SN, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke140 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X140SN
- 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 SI125X140SN
The AirTAC SI125X140SN is a discontinued double-acting ISO 15552 profile cylinder featuring a 125 mm bore and 140 mm stroke. It delivers a push force of 6136 N and pull force of 5734 N at 0.5 MPa, with a G1/2 air port and M27x2 rod thread. AirTAC replaced this legacy unit with the SAI125X140SN, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, port size and accessories.
The SAI upgrade introduces an advanced piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family adds the SAIL air-released lock and BSAI clamp-lock variants absent in the SI line. This -S magnet version supports CS1-B/DS1-B switches, and the -N NBR seal operates from -20 to +70 C.
Airtac SI125 Standard Cylinder SI125X140SN Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X140SN |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X140SN |
| Bore size | Ø125 mm |
| Stroke | 140 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 SAI125X140SN 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 SAI125X140SN 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 SI125X140SN
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×140 | 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 SI125X140SN Is Used
Heavy Stamping Press
Drives heavy-duty stamping and forming dies requiring high thrust, utilising the 6136 N push force at 0.5 MPa to shape thick metal components reliably.
Bulk Material Diversion
Actuates large diverter gates on high-capacity conveyor lines, moving heavy aggregate or packaged goods with positive 140 mm stroke action.
Replacing the Airtac SI125 Standard Cylinder SI125X140SN with the SAI125X140SN
To replace the discontinued SI125X140SN, order the SAI125X140SN direct equivalent, verifying the ISO 15552 mounting interface, 140 mm stroke, G1/2 port (PT/G/NPT thread options) and your specific mounting accessory (LB, FA, TC, etc.). The -S magnet allows use of CS1-B/DS1-B legacy sensors, while the SAI uses current AirTAC switches. Sizing both ways: neighbouring bores are 100 mm (3927 N push @0.5 MPa) and 160 mm (10053 N push @0.5 MPa); this 125 mm bore yields 8590 N at 0.7 MPa. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant for held loads. For any stroke >=300 mm, add external guide rails to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X140SN
- ✓ 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 SI125X140SN FAQ
Yes, the SI125X140SN is discontinued. The direct replacement is the SAI125X140SN. It features the same ISO 15552 mounting interface, 125 mm bore, 140 mm stroke, output force, G1/2 port and mounting accessories, fitting directly into existing fixtures.
The 125 mm bore cylinder provides a push force of 6136 N and pull force of 5734 N at 0.5 MPa. At 0.7 MPa push force is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical max force is 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s, with a 40 mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X140SN
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X140SN replacement — usually within 7-8 hours.