This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI125X1150, 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 SI125X1150
The AirTAC SI125 Standard Cylinder SI125X1150 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 1150mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI125X1150, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke1150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAI125X1150
- 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 SI125X1150
The AirTAC SI125X1150 is a discontinued double-acting ISO 15552 profile cylinder with a 125 mm bore and 1150 mm stroke, delivering 6136 N push force at 0.5 MPa via a G1/2 port. AirTAC replaced this legacy unit with the SAI125X1150, a direct sharing the exact mounting interface, M27x2 rod thread, and 40 mm cushions.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. Note this non-magnet SKU cannot take a sensor, unlike CS1-B/DS1-B equipped units. SAIL lock or BSAI clamp variants also exist for holding needs.
Airtac SI125 Standard Cylinder SI125X1150 Technical Specifications
| Model | Airtac SI125 Standard Cylinder SI125X1150 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI125X1150 |
| Bore size | Ø125 mm |
| Stroke | 1150 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 SAI125X1150 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 SAI125X1150 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 SI125X1150
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×1150 | 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 SI125X1150 Is Used
Long-Stroke Material Transfer
Drives heavy pallets across 1150 mm automated conveying lines where 6136 N at 0.5 MPa easily overcomes rolling friction and payload inertia.
Heavy Assembly Press
Applies steady clamping pressure for large component seating, relying on the 40 mm adjustable air cushions to decelerate the substantial rod mass.
Replacing the Airtac SI125 Standard Cylinder SI125X1150 with the SAI125X1150
To replace the SI125X1150, order the SAI125X1150 and verify the ISO 15552 mounting interface, G1/2 port (PT/G/NPT), and 1150 mm stroke. This non-magnet SKU cannot accept a CS1-B/DS1-B sensor; order an SAI with the S suffix if position sensing is required. At 0.5 MPa it pushes 6136 N and pulls 5734 N; if undersized, the neighbouring 160 mm bore yields 10053 N. Because 1150 mm exceeds 300 mm, use external guides to prevent rod bending and side-load damage. The cushion only decelerates; it does not hold load on air loss—use SAIL or BSAI lock variants, or a pilot check valve for static holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI125X1150
- ✓ 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 SI125X1150 FAQ
Yes, the SI125X1150 is discontinued. The direct replacement is the SAI125X1150. It shares the identical ISO 15552 mounting interface, 125 mm bore, 1150 mm stroke, G1/2 port, and output force, fitting existing fixtures perfectly.
It features a G1/2 port and M27x2 rod thread. Force output is 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 max of 1251 kgf at 1.0 MPa. Speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI125X1150
Send us the quantity and destination. We confirm price, stock and lead time on the SAI125X1150 replacement — usually within 7-8 hours.