This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X330S, 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 SI40X330S
The AirTAC SI40 Standard Cylinder SI40X330S 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 SAI40X330S, 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 → SAI40X330S
- 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 SI40X330S
The AirTAC SI40X330S is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 330 mm stroke. It delivers 628 N push force at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI40X330S, a direct upgrade retaining the exact same interface, bore, stroke, force, and mounting dimensions.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors.
Airtac SI40 Standard Cylinder SI40X330S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X330S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X330S |
| 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 SAI40X330S 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 SAI40X330S 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 SI40X330S
| 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 SI40X330S Is Used
Package Diversion
Actuates routing gates on packaging lines, utilizing the 628 N push force at 0.5 MPa to deflect cartons reliably at operating speeds up to 800 mm/s.
Pallet Stopper
Deploys a 330 mm stroke stop arm to halt pallets at workstation checkpoints, requiring external guide support to handle rod bending stresses.
Replacing the Airtac SI40 Standard Cylinder SI40X330S with the SAI40X330S
To replace the discontinued SI40X330S, order the SAI40X330S. Verify your ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 air port, and the M12x1.25 rod thread. Because this is a 330 mm stroke, use an external guide to prevent rod bending and side-load wear. Sizing options: the 40 mm bore yields 628 N push at 0.5 MPa; a neighbouring 50 mm bore provides 982 N if more force is needed, while a 32 mm bore offers 402 N for lighter loads. Note that a plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, consider the SAIL lock variant or an external pilot check valve. The -S magnet works with legacy CS1-B/DS1-B switches; the SAI uses current AirTAC sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X330S
- ✓ 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 SI40X330S FAQ
Yes, the SI40X330S is discontinued. The direct replacement is the SAI40X330S. It is dimensionally interchangeable per ISO 15552, maintaining the same 40 mm bore, 330 mm stroke, G1/4 port, and mounting interface, but features an upgraded two Y-shaped element piston seal for longer life.
The 40 mm bore features a G1/4 air port and an M12x1.25 rod thread. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, and 1130 N push at 0.9 MPa. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X330S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X330S replacement — usually within 7-8 hours.