This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X330, 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 SI40X330
The AirTAC Airtac SI40 Standard Cylinder SI40X330 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 330mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X330, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke330 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X330
- 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 SI40X330
The AirTAC SI40X330 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 330 mm stroke, delivering 628 N push force at 0.5 MPa. AirTAC replaced it with the SAI40X330, a direct upgrade retaining the exact ISO 15552 mounting interface, G1/4 port, and M12x1.25 rod thread.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. For sensing, note this specific SKU lacks a magnet and cannot accept a switch.
Airtac SI40 Standard Cylinder SI40X330 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X330 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X330 |
| Bore size | Ø40 mm |
| Stroke | 330 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 SAI40X330 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 SAI40X330 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 SI40X330
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×330 | 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 SI40X330 Is Used
Package Diversion
Pushes medium-weight cartons off a main conveyor line using the 628 N push force and 330 mm travel distance.
Pallet Stopper Gate
Acts as a pneumatic stop gate for pallets entering a wrapping station, utilizing the 330 mm stroke to clear the path.
Component Ejection
Ejects machined aluminum parts from a fixture, relying on adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X330 with the SAI40X330
To replace the SI40X330, order the SAI40X330 and confirm your ISO 15552 mounting accessory (LB, FA, TC, etc.), G1/4 port, and 330 mm stroke. If you need position sensing, select an SAI40X330S with a magnet, as this legacy SKU cannot take a sensor. Sizing down, a 32 mm bore yields 402 N push; sizing up, a 50 mm bore yields 982 N. For load holding, note a standard cylinder drifts without live air—use an external pilot check valve or the SAIL/BSAI lock variant. Because 330 mm exceeds 300 mm, use an external guide to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X330
- ✓ 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 SI40X330 FAQ
Yes, the SI40X330 is discontinued. The direct replacement is the AirTAC SAI40X330. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 330 mm stroke, output force, G1/4 port, and mounting interface.
The G1/4 port feeds a 16 mm rod. Force ratings are 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Request a Quote for the SAI40X330
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X330 replacement — usually within 7-8 hours.