This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X125SH, 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 SI40 Standard Cylinder SI40X125SH
The AirTAC SI40 Standard Cylinder SI40X125SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X125SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X125SH
- 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 SI40 Standard Cylinder SI40X125SH
The AirTAC SI40X125SH is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 125mm stroke. Delivering 628N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI40X125SH. This direct SAI upgrade matches the exact mounting interface, force, and dimensions, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -S/-H configured unit includes a piston magnet for CS1-B/DS1-B switches and a Viton H seal extending temperatures to 150C.
Airtac SI40 Standard Cylinder SI40X125SH Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X125SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X125SH |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40X125SH carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40X125SH produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40X125SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 SI40 Standard Cylinder SI40X125SH Is Used
Mid-Tonnage Clamping
Ideal for holding workpieces in CNC machining fixtures, utilizing the 628N push force at 0.5MPa with the high-temp Viton H seal.
Package Diverting
Drives 125mm stroke diverting arms on packaging lines, with the -S magnet triggering CS1-B/DS1-B switches for position confirmation.
Replacing the Airtac SI40 Standard Cylinder SI40X125SH with the SAI40X125SH
To replace the SI40X125SH, order the SAI40X125SH. Confirm the ISO 15552 mounting interface, 125mm stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. The -S magnet enables CS1-B/DS1-B sensors (the SAI uses current AirTAC switches), while the -H option provides the Viton H high-temp seal. For sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss; the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. The SAIF variant adds a built-in valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X125SH
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40X125SH FAQ
Yes, the SI40X125SH is discontinued. The direct replacement is the SAI40X125SH. It is dimensionally interchangeable per the ISO 15552 mounting interface, matching the 40mm bore, 125mm stroke, G1/4 port, and output force for a seamless fixture swap.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. It operates at 30-800mm/s with a 16mm rod and M12x1.25 thread.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X125SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X125SH replacement — usually within 7-8 hours.