This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X145S, 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 SI40X145S
The AirTAC SI40 Standard Cylinder SI40X145S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X145S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X145S
- 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 SI40X145S
The AirTAC SI40X145S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 145 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X145S, a direct upgrade retaining the exact interface, force, and mounting dimensions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X145S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X145S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X145S |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAI40X145S 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 SAI40X145S 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 SI40X145S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SI40X145S Is Used
Clamp Actuation
Drives mid-force clamping arms holding 32 kg workpieces securely in CNC machining centers.
Package Diverting
Pushes cartons across sorting lanes with a 145 mm travel and 628 N thrust at 0.5 MPa.
Pallet Stops
Acts as a pneumatic stop gate for lightweight pallets, retracting 145 mm to release flow.
Replacing the Airtac SI40 Standard Cylinder SI40X145S with the SAI40X145S
To replace the SI40X145S, order the SAI40X145S. Confirm the ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, G1/4 port, and your specific mounting accessory (LB, FA, TC, etc.). The -S suffix indicates a piston magnet for CS1-B/DS1-B legacy sensors; the SAI replacement uses current AirTAC switches. If sizing up or down, the 32 mm bore yields 402 N push, while the 50 mm bore yields 982 N at 0.5 MPa. A plain cylinder drifts on air loss, so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the stroke is under 300 mm, side-load rod-bending risks are minimal, but always verify guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X145S
- ✓ 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 SI40X145S FAQ
Yes, the SI40X145S is discontinued. The direct replacement is the AirTAC SAI40X145S. It shares the identical ISO 15552 mounting interface, 40 mm bore, 145 mm stroke, output force, and G1/4 port, fitting existing fixtures perfectly.
The 40 mm bore features a G1/4 air port and M12x1.25 rod thread. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X145S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X145S replacement — usually within 7-8 hours.