This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X150STC, 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 SI40X150STC
The AirTAC Airtac SI40 Standard Cylinder SI40X150STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X150STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X150STC
- 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 SI40X150STC
The AirTAC SI40X150STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 150mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X150STC, which shares the exact ISO 15552 mounting interface, TC trunnion mount, and output force.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SI -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Viton H seals raise the temperature range to 0-150C.
Airtac SI40 Standard Cylinder SI40X150STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X150STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X150STC |
| Bore size | Ø40 mm |
| Stroke | 150 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 SAI40X150STC 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 SAI40X150STC 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 SI40X150STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 SI40X150STC Is Used
Package Diversion
Pushes lightweight cartons at 30-800 mm/s onto adjacent conveyor lanes using the 628N push force.
Pallet Stopper
Acts as a pneumatic stop for inbound pallets, utilizing the TC trunnion mount to absorb offset stresses.
Clamp Actuation
Secures medium workpieces during machining, where the 528N pull force safely holds the load.
Replacing the Airtac SI40 Standard Cylinder SI40X150STC with the SAI40X150STC
To replace the SI40X150STC, order the SAI40X150STC. Verify the ISO 15552 TC trunnion mounting, 40mm bore, 150mm stroke, G1/4 port (PT/G/NPT thread), and the -S magnet. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is needed, the 32mm bore provides 402N. Note that a plain cylinder drifts without live air, as the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. At 150mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X150STC
- ✓ 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 SI40X150STC FAQ
Yes, the SI40X150STC is discontinued. The direct replacement is the SAI40X150STC. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 150mm stroke, G1/4 port, TC mount, and 628N force.
The 40mm bore uses a G1/4 port. At 0.5MPa it provides 628N push and 528N pull. At 0.7MPa push is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X150STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X150STC replacement — usually within 7-8 hours.