This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX30, 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 SI40AX30
The AirTAC Airtac SI40 Standard Cylinder SI40AX30 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX30, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX30
- 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 SI40AX30
The AirTAC SI40AX30 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 30mm stroke. It delivers 628 N push and 528 N pull at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX30, which shares the exact same interface, force, and mounting.
This SKU features a SUS420J2 stainless steel rod (option A) but lacks a magnet, so it cannot accept a CS1-B/DS1-B sensor. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure.
Airtac SI40 Standard Cylinder SI40AX30 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX30 |
| Bore size | Ø40 mm |
| Stroke | 30 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 SAI40AX30 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 SAI40AX30 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 SI40AX30
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 SI40AX30 Is Used
Short-Stroke Clamping
Ideal for holding light aluminium extrusions in a machining fixture, using the 628 N push force at 0.5 MPa to secure parts without deformation.
Ejector Mechanism
Provides a fast 30mm ejection stroke for small plastic moulded components out of a sub-assembly jig, operating reliably at speeds of 30-800 mm/s.
Gate Diversion
Drives a short diverter arm on a packaging line to route small cartons, with the SUS420J2 stainless rod offering corrosion resistance in humid environments.
Replacing the Airtac SI40 Standard Cylinder SI40AX30 with the SAI40AX30
To replace the SI40AX30, order the SAI40AX30 and verify your ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread. Because this specific SKU has no magnet (-S), it cannot support legacy CS1-B/DS1-B switches; order a magnet-equipped SAI variant if position sensing is required. For sizing alternatives, a neighbouring 32mm bore provides 402 N push @0.5 MPa, while a 50mm bore offers 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant for load holding. The 30mm stroke is well within the 1200mm maximum, so no side-load guide concerns apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX30
- ✓ 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 SI40AX30 FAQ
Yes, the SI40AX30 is discontinued. The direct replacement is the SAI40AX30. It is dimensionally interchangeable per ISO 15552, maintaining the same 40mm bore, 30mm stroke, 628 N force, G1/4 port, and mounting accessories.
This double-acting cylinder uses a G1/4 air port and generates 628 N push / 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX30 replacement — usually within 7-8 hours.