This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X215, 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 SI125X215
The AirTAC SI125 Standard Cylinder SI125X215 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 215mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X215, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke215 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X215
- 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 SI125X215
The AirTAC SI125X215 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 215 mm stroke. It delivers 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X215 direct replacement, matching the exact mounting interface, output force, and dimensions.
The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. This SKU lacks a magnet (-S) so it cannot take a CS1-B/DS1-B sensor.
Airtac SI125 Standard Cylinder SI125X215 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X215 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X215 |
| Bore size | Ø125 mm |
| Stroke | 215 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 SAI125X215 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 SAI125X215 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 SI125X215
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×215 | 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 SI125X215 Is Used
Heavy Press Clamping
Secures large metal castings during machining, utilizing the 6136 N push force at 0.5 MPa to hold components rigidly against cutting loads.
Bulk Material Diversion
Actuates heavy-duty flow gates on aggregate lines, moving dense loads at 30-500 mm/s without requiring position feedback.
Replacing the Airtac SI125 Standard Cylinder SI125X215 with the SAI125X215
To replace the SI125X215, order the SAI125X215. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/2 port thread (PT, G, or NPT), and the M27x2 rod thread. Since this SKU lacks a magnet, it cannot accept position sensors; if sensing is needed, specify an SAI with the S suffix. The 215 mm stroke keeps the rod well within the 1500 mm standard limit, but always guide external loads to prevent rod bending. If you need to hold position on air loss, note that the cushion only decelerates; use an external pilot check valve or the SAIL/BSAI lock variants. For less force, the 100 mm bore gives 3927 N push at 0.5 MPa; for more, the 160 mm bore yields 10053 N.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X215
- ✓ 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 SI125X215 FAQ
Yes, the SI125X215 is discontinued. The direct replacement is the SAI125X215. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 215 mm stroke, G1/2 port, and mounting interface.
The G1/2 port feeds a 32 mm rod. At 0.5 MPa it provides 6136 N push and 5734 pull force. At 0.7 MPa push is 8590 N, and 11045 N at 0.9 MPa. The theoretical maximum force is 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X215
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X215 replacement — usually within 7-8 hours.