This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX45, 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 SI40AX45
The AirTAC Airtac SI40 Standard Cylinder SI40AX45 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 45mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX45, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX45
- 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 SI40AX45
The AirTAC SI40AX45 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 45mm stroke, delivering 628N push force at 0.5MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40AX45, a direct upgrade retaining the exact interface, M12x1.25 rod thread and 27mm cushions. The SAI features an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. This specific SKU uses a SUS420J2 stainless steel rod for corrosion resistance, but lacks a magnet, meaning it cannot accept position switches.
Airtac SI40 Standard Cylinder SI40AX45 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX45 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX45 |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAI40AX45 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 SAI40AX45 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 SI40AX45
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SI40AX45 Is Used
Clamp Actuation
Uses the 628N push force at 0.5MPa to secure medium-duty aluminum or steel workpieces during CNC milling operations.
Package Diverting
Executes short 45mm strokes to push light-to-medium cartons off a main packaging line onto a secondary routing belt.
Component Insertion
Presses bearings or pins into housings on an assembly line, utilizing the SUS420J2 stainless rod in mildly humid environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX45 with the SAI40AX45
To replace the SI40AX45, order the SAI40AX45 to guarantee the ISO 15552 mounting interface, 40mm bore, 45mm stroke, G1/4 port, and SUS420J2 rod are identical. If downsizing, a 32mm bore yields 402N at 0.5MPa; if upsizing, a 50mm bore provides 982N. Because this SKU lacks the -S magnet, it cannot support legacy CS1-B/DS1-B sensors, so order an -S variant if position detection is needed. Note that a plain cylinder drifts on air loss since cushions only decelerate; for load holding, specify an external pilot check valve or the SAIL/BSAI lock variant. The 45mm stroke is well under the 1200mm standard maximum, so rod-bending side loads are negligible.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX45
- ✓ 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 SI40AX45 FAQ
Yes, the SI40AX45 is discontinued. The direct replacement is the AirTAC SAI40AX45. It shares the same ISO 15552 mounting interface, 40mm bore, 45mm stroke, output force, G1/4 port, and M12x1.25 rod thread, fitting existing fixtures perfectly while adding an upgraded piston seal.
The 40mm bore uses a G1/4 air port. At 0.5MPa it provides 628N push and 528N pull force. At 0.7MPa the push force is 879N, and at 0.9MPa it is 1130N. The theoretical maximum force is 128kgf at 1.0MPa.
Request a Quote for the SAI40AX45
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX45 replacement — usually within 7-8 hours.