This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X530S, 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 SI125X530S
The AirTAC SI125 Standard Cylinder SI125X530S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 530mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X530S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke530 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X530S
- 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 SI125X530S
The AirTAC SI125X530S is a discontinued double-acting ISO 15552 profile cylinder featuring a 125mm bore and 530mm stroke. Delivering 6136 N push force at 0.5 MPa, it is replaced directly by the SAI125X530S. This direct successor retains the exact G1/2 port, M27x2 rod thread, and mounting interface, fitting existing fixtures seamlessly.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S suffix indicates a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X530S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X530S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X530S |
| Bore size | Ø125 mm |
| Stroke | 530 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 SAI125X530S 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 SAI125X530S 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 SI125X530S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×530 | 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 SI125X530S Is Used
Heavy Stamping Press
Drives large platens in metal forming with 6136 N push at 0.5 MPa, relying on the 40mm adjustable air cushions to absorb impact at stroke ends.
Automated Clamping Fixture
Secures heavy workpieces during machining, using the G1/2 port for high flow rates to maintain rapid 30-500 mm/s cycling.
Replacing the Airtac SI125 Standard Cylinder SI125X530S with the SAI125X530S
To replace the SI125X530S, order the SAI125X530S. Confirm the ISO 15552 mounting interface, 125mm bore, 530mm stroke, G1/2 port (PT/G/NPT thread options), and your mounting accessory. The -S magnet equates to current AirTAC switches on the SAI (legacy used CS1-B/DS1-B). Sizing both ways: a 100mm bore yields 3927 N push at 0.5 MPa, while a 160mm bore yields 10053 N. For a 530mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts without live air; for load holding, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X530S
- ✓ 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 SI125X530S FAQ
Yes, the SI125X530S is discontinued. The direct replacement is the SAI125X530S. It is dimensionally interchangeable per ISO 15552, retaining the same 125mm bore, 530mm stroke, output force, G1/2 port, and mounting interface, but features an upgraded two Y-shaped one-way piston seal.
The bore is 125mm with a G1/2 air port and M27x2 rod thread. Force ratings are: push 6136 N and pull 5734 N at 0.5 MPa, push 8590 N at 0.7 MPa, push 11045 N at 0.9 MPa, and a theoretical max of 1251 kgf at 1.0 MPa. Operating speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X530S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X530S replacement — usually within 7-8 hours.