This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1050S, 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 SI40X1050S
The AirTAC Airtac SI40 Standard Cylinder SI40X1050S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1050mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1050S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1050 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1050S
- 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 SI40X1050S
The AirTAC SI40X1050S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40 mm bore, 1050 mm stroke, G1/4 port, and a piston magnet for CS1-B/DS1-B sensors. Delivering 628 N push force at 0.5 MPa, it is directly replaced by the SAI40X1050S direct.
The SAI upgrade retains identical ISO 15552 mounting dimensions but introduces a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also adds SAIL and BSAI lock variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X1050S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1050S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1050S |
| Bore size | Ø40 mm |
| Stroke | 1050 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 SAI40X1050S 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 SAI40X1050S 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 SI40X1050S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1050 | 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 SI40X1050S Is Used
Long-Stroke Diversion
Pushes packages across a 1-meter transfer gap using the 1050 mm stroke and 628 N force.
Pneumatic Slide Gate
Actuates 1-meter wide hopper gates, relying on the G1/4 port and 528 N pull force for closure.
Replacing the Airtac SI40 Standard Cylinder SI40X1050S with the SAI40X1050S
To replace the SI40X1050S, order the SAI40X1050S ensuring the ISO 15552 mounting, 40 mm bore, 1050 mm stroke, G1/4 port, and magnet are retained. At 0.5 MPa it yields 628 N push and 528 N pull; if undersized, the neighbouring 50 mm bore provides 982 N push. Because the 1050 mm stroke invites rod bending, use an external guide to prevent side loads. Note that plain cylinders drift without air; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1050S
- ✓ 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 SI40X1050S FAQ
Yes, the SI40X1050S is discontinued. The direct replacement is the SAI40X1050S, which shares the same ISO 15552 mounting interface, 40 mm bore, 1050 mm stroke, G1/4 port, and output force.
This 40 mm bore cylinder has a G1/4 port and provides 628 N push / 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 SAI40X1050S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1050S replacement — usually within 7-8 hours.