This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X30, 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 SI40X30
The AirTAC Airtac SI40 Standard Cylinder SI40X30 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 SAI40X30, 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 → SAI40X30
- 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 SI40X30
The AirTAC SI40X30 is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 30mm stroke, delivering 628N push force at 0.5MPa via a G1/4 port. As an end-of-line component, it is superseded by the SAI40X30 direct replacement, which maintains the exact same interface, output and mounting dimensions.
The SAI upgrade introduces a refined piston seal utilizing two Y-shaped one-way elements for low start-up pressure and extended life. This SKU lacks a magnet and cannot accept a sensor. If high temperatures up to 150C are required, a Viton H seal option is available.
Airtac SI40 Standard Cylinder SI40X30 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X30 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X30 |
| 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 SAI40X30 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 SAI40X30 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 SI40X30
| 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 SI40X30 Is Used
Short-Stroke Clamping
Ideal for holding light metal or composite parts in machining fixtures using its 628N push force over a compact 30mm travel.
Package Diverting
Provides rapid actuation for sorting small to medium packages on packaging lines, operating efficiently at 30-800 mm/s.
Ejector Mechanisms
Delivers reliable ejection of finished components from automated machinery where a brief 30mm stroke is sufficient.
Replacing the Airtac SI40 Standard Cylinder SI40X30 with the SAI40X30
To replace the obsolete SI40X30, order the SAI40X30. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. Because this specific SKU has no -S magnet, it cannot support position sensing; if switches are needed, select an SAI40X30S and use current AirTAC sensors. For sizing alternatives, a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore provides 982N. Note that a plain cylinder drifts without live air; for load holding, consider the SAIL lock, BSAI clamp-lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X30
- ✓ 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 SI40X30 FAQ
Yes, the AirTAC SI40X30 is discontinued. The direct replacement is the SAI40X30, which offers identical ISO 15552 mounting dimensions, 40mm bore, 30mm stroke, and G1/4 port.
The bore is 40mm with a G1/4 air port. Force output is 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X30
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X30 replacement — usually within 7-8 hours.