This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X360S, 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 SI125X360S
The AirTAC SI125 Standard Cylinder SI125X360S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 360mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X360S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke360 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X360S
- 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 SI125X360S
The AirTAC SI125X360S is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 360 mm stroke. It delivers a 6136 N push force at 0.5 MPa through a G1/2 port. AirTAC replaced this legacy unit with the SAI125X360S, a direct sharing the exact ISO 15552 mounting interface, M27x2 thread, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces lock and clamp variants (SAIL, BSAI) absent in the SI line. Your -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X360S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X360S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X360S |
| Bore size | Ø125 mm |
| Stroke | 360 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 SAI125X360S 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 SAI125X360S 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 SI125X360S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×360 | 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 SI125X360S Is Used
Heavy Press Clamping
Secures large steel plates in machining centers, utilizing the 6136 N push force at 0.5 MPa to hold components rigidly against cutting vibrations.
Automated Assembly Line
Indexing heavy automotive subassemblies along a 360 mm travel path, requiring external guide rails to prevent rod bending during transit.
Replacing the Airtac SI125 Standard Cylinder SI125X360S with the SAI125X360S
To replace the SI125X360S, order the SAI125X360S. Verify your ISO 15552 mounting fixtures, the G1/2 air port, and the M27x2 rod-end thread. The -S magnet means it accepts CS1-B/DS1-B switches (the SAI uses current AirTAC sensors). If sizing up or down, note the 100 mm bore offers 3927 N push at 0.5 MPa, while the 160 mm bore provides 10053 N. Because this is a 360 mm stroke, prevent rod bending by using external guides to manage side loads. A plain cylinder drifts on air loss; the cushion only decelerates. For load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X360S
- ✓ 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 SI125X360S FAQ
Yes, the SI125X360S is discontinued. The direct replacement is the SAI125X360S. It shares the identical ISO 15552 mounting interface, 125 mm bore, 360 mm stroke, output force, and G1/2 port, fitting directly into your existing fixtures.
This double-acting cylinder features a G1/2 air port and M27x2 rod thread. It generates a push force of 6136 N and a pull force of 5734 N at 0.5 MPa. At 0.7 MPa the push force is 8590 N, reaching 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 SAI125X360S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X360S replacement — usually within 7-8 hours.