This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X225N, 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 SI125X225N
The AirTAC SI125 Standard Cylinder SI125X225N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 225mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X225N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke225 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X225N
- 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 SI125X225N
The AirTAC SI125X225N is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 225 mm stroke. It delivers 6136 N push force at 0.5 MPa via a G1/2 port. The direct replacement is the SAI125X225N, which shares the exact same interface, force, and mounting. This NBR-sealed (-N) unit operates from -20 to +70 C and lacks a magnet, meaning it cannot accept magnetic switches.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. If high heat is expected, a Viton H seal raises the ceiling to 150 C.
Airtac SI125 Standard Cylinder SI125X225N Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X225N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X225N |
| Bore size | Ø125 mm |
| Stroke | 225 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 SAI125X225N 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 SAI125X225N 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 SI125X225N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×225 | 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 SI125X225N Is Used
Heavy Stamping Press
Drives large platens and heavy dies requiring 6136 N of thrust at 0.5 MPa, utilizing the adjustable 40 mm cushion to halt massive inertia smoothly.
Large Clamp Fixture
Secures bulky components during machining, relying on the 125 mm bore's 1251 kgf maximum theoretical force for rigid, deflection-free holding.
Replacing the Airtac SI125 Standard Cylinder SI125X225N with the SAI125X225N
To replace this SI125X225N, order the SAI125X225N, verifying the ISO 15552 mounting interface, 225 mm stroke, G1/2 port, and NBR seal. Because this specific SKU lacks a magnet (-S), it cannot support position sensing; if you require switches, select an SAI125X225NS and use current AirTAC sensors instead of the legacy CS1-B/DS1-B. If sizing up or down, adjacent bores offer different footprints: the 100 mm bore yields 3927 N push at 0.5 MPa, while the 160 mm bore yields 10053 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so for load holding, specify the SAIL or BSAI lock variant, or use an external pilot check valve. At 225 mm stroke, side-load risks are low, but always ensure rigid guidance to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X225N
- ✓ 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 SI125X225N FAQ
Yes, the SI125X225N is discontinued. The direct replacement is the AirTAC SAI125X225N. It is dimensionally interchangeable per ISO 15552, retaining the same 125 mm bore, 225 mm stroke, G1/2 port, and mounting fixtures.
This cylinder features a G1/2 air port. It generates 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, and a maximum theoretical force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X225N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X225N replacement — usually within 7-8 hours.