This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X30S, 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 SI125X30S
The AirTAC SI125 Standard Cylinder SI125X30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 30mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke30 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X30S
- 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 SI125X30S
The AirTAC SI125X30S is a discontinued double-acting ISO 15552 profile cylinder with a 125mm bore and 30mm stroke. Delivering 6136N push force at 0.5MPa via a G1/2 port, it is replaced by the SAI125X30S. This direct successor matches the exact mounting, thread, and force specs.
The SAI125X30S upgrades the piston seal with two Y-shaped one-way elements for low start-up pressure. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. Your -S magnet works with CS1-B/DS1-B sensors.
Airtac SI125 Standard Cylinder SI125X30S Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X30S |
| Bore size | Ø125 mm |
| Stroke | 30 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 SAI125X30S 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 SAI125X30S 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 SI125X30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×30 | 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 SI125X30S Is Used
Heavy-Duty Pressing
Applies the 6136N push force at 0.5MPa to seat bearings or stake metal components securely in automated machinery.
Pallet Diversion
Uses the short 30mm stroke to rapidly pop up diverters or stops for heavy product handling lines.
Clamp Actuation
Drives robust clamping jaws to secure large workpieces or pallets during transfer operations.
Replacing the Airtac SI125 Standard Cylinder SI125X30S with the SAI125X30S
To replace the SI125X30S, order the SAI125X30S. It drops into existing fixtures per ISO 15552 interface dimensions, keeping the 125mm bore, 30mm stroke, G1/2 port, and M27x2 thread. If downsizing, a 100mm bore yields 3927N at 0.5MPa; if uprating, a 160mm bore gives 10053N. The 30mm stroke is short, so side-load risks are minimal, but always verify guide alignment. A plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. The -S magnet supports CS1-B/DS1-B switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X30S
- ✓ 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 SI125X30S FAQ
Yes, the SI125X30S is discontinued. The direct replacement is the SAI125X30S. It is dimensionally interchangeable per ISO 15552, matching the 125mm bore, 30mm stroke, G1/2 port, and mounting hardware.
It delivers 6136N push and 5734N pull at 0.5MPa, 8590N push at 0.7MPa, 11045N at 0.9MPa, and a max force of 1251kgf at 1.0MPa. Operating speed is 30-500mm/s. The G1/2 port and M27x2 thread are fixed by the 125mm bore.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X30S replacement — usually within 7-8 hours.