This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X350SCB, 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 SI40X350SCB
The AirTAC Airtac SI40 Standard Cylinder SI40X350SCB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X350SCB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X350SCB
- 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 SI40X350SCB
The AirTAC SI40X350SCB is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 350 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. AirTAC replaced this legacy unit with the SAI40X350SCB, a direct replacement retaining the exact same ISO 15552 mounting interface, bore, stroke, output force, and CB clevis mount.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For applications needing load holding on air loss, the SAI family introduces SAIL and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X350SCB Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X350SCB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X350SCB |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAI40X350SCB 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 SAI40X350SCB 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 SI40X350SCB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SI40X350SCB Is Used
Package Diverting
Pushes medium-weight cartons across transfer belts using the 628 N push force at 0.5 MPa.
Pallet Stopper Gate
Acts as a pneumatic stop for pallets on roller conveyors, utilizing the CB clevis for pivot.
Component Ejection
Ejects machined parts from a fixture over the 350 mm stroke, requiring external guides.
Replacing the Airtac SI40 Standard Cylinder SI40X350SCB with the SAI40X350SCB
To replace the SI40X350SCB, order the SAI40X350SCB. Confirm the ISO 15552 CB clevis mounting, 40 mm bore, 350 mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). Sizing both ways: a 32 mm bore offers 402 N push, while a 50 mm bore yields 982 N. At 0.7 MPa this 40 mm cylinder outputs 879 N. A plain cylinder drifts on air loss; the cushion only decelerates, so use an external rod lock or pilot check valve for holding. Because the 350 mm stroke is long, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X350SCB
- ✓ 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 SI40X350SCB FAQ
Yes, the AirTAC SI40X350SCB is discontinued. The direct replacement is the SAI40X350SCB. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 350 mm stroke, G1/4 port, and CB clevis mounting.
The bore is 40 mm with a G1/4 air port. 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.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X350SCB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X350SCB replacement — usually within 7-8 hours.