This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX90, 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 SI40AX90
The AirTAC Airtac SI40 Standard Cylinder SI40AX90 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 90mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX90, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX90
- 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 SI40AX90
The AirTAC SI40AX90 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 90mm stroke. Delivering 628 N push force at 0.5 MPa through a G1/4 port, it is replaced by the SAI40AX90. This direct upgrade shares the exact ISO 15552 mounting interface, bore, stroke, force, port and accessories.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The -A suffix denotes a SUS420J2 stainless steel rod for corrosion resistance. Note this SKU lacks a magnet, so it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40AX90 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX90 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX90 |
| Bore size | Ø40 mm |
| Stroke | 90 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 SAI40AX90 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 SAI40AX90 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 SI40AX90
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SI40AX90 Is Used
Compact Part Ejection
Uses the 628 N push force at 0.5 MPa to reliably push machined components out of a fixture within a tight 90 mm stroke envelope.
Package Diverting
Actuates a routing gate on a packaging line, where the SUS420J2 stainless rod provides added resilience against occasional washdowns.
Replacing the Airtac SI40 Standard Cylinder SI40AX90 with the SAI40AX90
To replace the SI40AX90, order the SAI40AX90. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the 90mm stroke, and the G1/4 port (PT/G/NPT). Because this SKU has no -S magnet, it cannot accept a CS1-B/DS1-B switch; choose a magnet-equipped SAI if sensing is needed. Sizing both ways: this 40mm bore yields 628 N push at 0.5 MPa, whereas a 32mm bore gives 402 N and a 50mm bore gives 982 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve (or the SAIL/BSAI lock variant) to hold loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX90
- ✓ 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 SI40AX90 FAQ
Yes, the SI40AX90 is discontinued. The direct replacement is the SAI40AX90. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 90mm stroke, 628 N output force, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 air port. At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa push is 879 N, at 0.9 MPa it is 1130 N, and the theoretical maximum force is 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX90
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX90 replacement — usually within 7-8 hours.