This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX65, 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 SI40AX65
The AirTAC Airtac SI40 Standard Cylinder SI40AX65 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX65, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX65
- 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 SI40AX65
The AirTAC SI40AX65 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 65 mm stroke. It delivers 628 N push force at 0.5 MPa through its G1/4 port. The direct replacement is the SAI40AX65, which maintains the exact same interface, bore, stroke, force, and mounting dimensions for existing fixtures.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This specific SKU uses an SUS420J2 stainless steel rod (A suffix) for corrosion resistance, but lacks a magnet, meaning it cannot accept position sensors.
Airtac SI40 Standard Cylinder SI40AX65 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX65 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX65 |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAI40AX65 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 SAI40AX65 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 SI40AX65
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SI40AX65 Is Used
Stainless Rod Clamping
Ideal for moderate-duty clamping tasks where the SUS420J2 stainless rod offers better corrosion resistance than standard carbon steel.
Package Diverting
Provides reliable 65 mm stroke actuation to push or divert light-to-medium packages along a manufacturing line.
Replacing the Airtac SI40 Standard Cylinder SI40AX65 with the SAI40AX65
To replace the SI40AX65, order the SAI40AX65. Confirm the ISO 15552 mounting interface, the 65 mm stroke, the G1/4 port, and your mounting accessory. Because this SKU lacks a magnet (-S), it cannot support sensors; if sensing is needed, specify an SAI40X65S. The SUS420J2 stainless rod is retained. If you need more force, the neighboring 50 mm bore offers 982 N push at 0.5 MPa; if less is acceptable, the 32 mm bore provides 402 N. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, consider the SAIL or BSAI lock variants, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX65
- ✓ 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 SI40AX65 FAQ
Yes, the AirTAC SI40AX65 is discontinued. The direct replacement is the SAI40AX65. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 65 mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder features a G1/4 air port. It delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa. At 0.7 MPa the push force is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX65
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX65 replacement — usually within 7-8 hours.