This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X200, 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 SI125X200
The AirTAC SI125 Standard Cylinder SI125X200 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 200mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X200, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X200
- 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 SI125X200
The AirTAC SI125X200 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 200 mm stroke, delivering 6136 N push force at 0.5 MPa. The direct replacement is the SAI125X200, matching the G1/2 port, M27x2 rod thread, and 40 mm cushions. This SKU lacks a magnet, so it cannot accept a position switch.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. If higher heat is expected, Viton H seals raise the temperature limit to 150 C.
Airtac SI125 Standard Cylinder SI125X200 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X200 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X200 |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAI125X200 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 SAI125X200 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 SI125X200
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SI125X200 Is Used
Heavy-Duty Pressing
Generates 8590 N of thrust at 0.7 MPa, ideal for seating large bearings or forming heavy-gauge metal components in automated machinery.
Pallet Dispensing
Provides the robust push force needed to separate and feed empty pallets on high-throughput packaging and distribution conveyor lines.
Mold Clamping
Secures large industrial molds or heavy fixtures with a theoretical maximum output of 1251 kgf, ensuring stability during high-vibration operations.
Replacing the Airtac SI125 Standard Cylinder SI125X200 with the SAI125X200
To replace the SI125X200, order the SAI125X200. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/2 air port, and the 200 mm stroke. Because this specific SKU has no -S magnet, it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped version if sensing is required. Sizing both ways: this 125 mm bore yields 6136 N push at 0.5 MPa, while an 80 mm bore offers 2513 N. For load holding on air loss, note that a standard cylinder drifts; use an external pilot check valve or the SAIL/BSAI lock variants. At 200 mm stroke, side-load and rod-bending risks are minimal, but ensure guide alignment to protect the 32 mm rod.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X200
- ✓ 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 SI125X200 FAQ
Yes, the SI125X200 is discontinued. The direct replacement is the AirTAC SAI125X200. It is dimensionally interchangeable per the ISO 15552 mounting interface, retaining the exact same 125 mm bore, 200 mm stroke, output force, G1/2 port, and mounting accessories.
This double-acting cylinder features a G1/2 air port and a 32 mm rod. The thrust ratings are: 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 theoretical maximum force of 1251 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X200
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X200 replacement — usually within 7-8 hours.