This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X30TC, 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 SI40X30TC
The AirTAC Airtac SI40 Standard Cylinder SI40X30TC 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 SAI40X30TC, 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 → SAI40X30TC
- 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 SI40X30TC
The AirTAC SI40X30TC 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. It is replaced by the SAI40X30TC.
The SAI direct keeps the exact ISO 15552 TC trunnion mounting, stroke and force. It adds an upgraded piston seal (two Y-shaped elements, low start-up pressure) and introduces SAIL, SAIF and BSAI variants. This no-magnet SKU cannot take a sensor.
Airtac SI40 Standard Cylinder SI40X30TC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X30TC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X30TC |
| 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 SAI40X30TC 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 SAI40X30TC 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 SI40X30TC
| 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 SI40X30TC Is Used
Package Diverting
Provides rapid 30mm actuation for diverting arms on packaging lines, utilising the 30-800mm/s speed range to push lightweight goods efficiently.
Ejector Mechanisms
Suitable for ejecting small finished components from press beds, offering 628N of push force at 0.5MPa within a tight ISO 15552 footprint.
Replacing the Airtac SI40 Standard Cylinder SI40X30TC with the SAI40X30TC
To replace this SI40X30TC with the SAI40X30TC, verify the 40mm bore, 30mm stroke, G1/4 port and TC trunnion mount. This non-magnet SKU lacks a sensor groove for CS1-B/DS1-B switches. For higher loads, the 50mm bore yields 982N push at 0.5MPa; for lighter duties, the 32mm bore gives 402N. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X30TC
- ✓ 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 SI40X30TC FAQ
Yes, the SI40X30TC is discontinued. The direct replacement is the SAI40X30TC, which shares the identical ISO 15552 interface, 40mm bore, 30mm stroke, 628N force and G1/4 port.
It features a G1/4 port and M12x1.25 rod thread. Forces are 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a 128kgf maximum at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X30TC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X30TC replacement — usually within 7-8 hours.