This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X270, 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 SI125X270
The AirTAC SI125 Standard Cylinder SI125X270 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 270mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X270, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke270 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X270
- 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 SI125X270
The AirTAC SI125X200 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 270 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X200, which matches the exact bore, stroke, output force, G1/2 port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. Note that this specific SKU lacks a magnet and cannot accept position sensors.
Airtac SI125 Standard Cylinder SI125X270 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X270 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X270 |
| Bore size | Ø125 mm |
| Stroke | 270 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 SAI125X270 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 SAI125X270 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 SI125X270
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×270 | 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 SI125X270 Is Used
Heavy Stamping Press
Drives large platens in automated metal forming lines, utilizing the 6136 N push force at 0.5 MPa to shape thick gauge materials reliably.
Pallet Positioning
Shifts loaded pallets along roller conveyors in distribution hubs, where the 313 kg vertical lift capacity handles substantial weight transitions safely.
Mold Actuation
Opens and closes heavy industrial molds in plastics manufacturing, relying on the robust 32 mm piston rod and adjustable 40 mm air cushions for smooth deceleration.
Replacing the Airtac SI125 Standard Cylinder SI125X270 with the SAI125X270
To replace the SI125X200, order the SAI125X270 equivalent, confirming the ISO 15552 mounting interface, 125 mm bore, 270 mm stroke, G1/2 port, and accessory type (such as LB foot or TC trunnion). Because this SKU lacks the -S magnet suffix, it cannot support CS1-B/DS1-B sensors; order a magnet-equipped version if position detection is needed. For sizing alternatives, the neighboring 100 mm bore provides 3927 N push at 0.5 MPa, while the 160 mm bore offers 10053 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve. Since the stroke exceeds 300 mm, ensure adequate guide support to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X270
- ✓ 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 SI125X270 FAQ
Yes, the AirTAC SI125X200 is discontinued. The direct replacement is the SAI125X200, a current-production ISO 15552 cylinder. It matches the original bore, stroke, port, and mounting dimensions exactly, dropping into existing fixtures without modification.
This 125 mm bore cylinder features a G1/2 air port and an M27x2 rod thread. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and at 0.9 MPa it is 11045 N. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X270
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X270 replacement — usually within 7-8 hours.