This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X1450S, 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 SI40X1450S
The AirTAC Airtac SI40 Standard Cylinder SI40X1450S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 1450mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X1450S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke1450 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X1450S
- 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 SI40X1450S
The AirTAC SI40X1450S is a discontinued double-acting ISO 15552 profile cylinder featuring a 40 mm bore, 1450 mm stroke, G1/4 port, and 628 N push force at 0.5 MPa. Because 1450 mm exceeds the 1200 mm standard maximum for this bore, it is a non-standard, made-to-order length. AirTAC replaced this legacy unit with the SAI40X1450S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces an advanced piston seal utilizing two Y-shaped one-way elements for extended lifespan and lower start-up pressure. For applications needing load holding on air loss, the new SAI family includes SAIL and BSAI lock variants absent in the SI line. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, though the SAI successor uses current AirTAC switches.
Airtac SI40 Standard Cylinder SI40X1450S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X1450S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X1450S |
| Bore size | Ø40 mm |
| Stroke | 1450 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 SAI40X1450S 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 SAI40X1450S 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 SI40X1450S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×1450 | 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 SI40X1450S Is Used
Long-Reach Diversion
Actuates routing gates on extended conveyor lines where a 1450 mm travel distance is required to span wide product flows.
High-Bay Pusher
Pushes storage totes into deep-lane racking, utilizing the 628 N thrust to handle packaged goods safely.
Material Descent Control
Lowers light fixtures or tooling heads over a tall 1.45 m descent, relying on adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI40 Standard Cylinder SI40X1450S with the SAI40X1450S
To replace the discontinued SI40X1450S, order the SAI40X1450S direct equivalent, verifying your ISO 15552 mounting interface, G1/4 port thread, and magnet requirement. The SAI retains identical dimensions and accessories. When sizing, a 32 mm bore offers 402 N push at 0.5 MPa, while a 50 mm bore provides 982 N; this 40 mm bore yields 628 N push and 528 N pull at 0.5 MPa, peaking at 128 kgf at 1.0 MPa. Because this is a 1450 mm non-standard stroke exceeding the 1200 mm standard maximum, ensure external guides are used to prevent rod bending and side-load damage. A plain cylinder will not hold a load on air loss—the cushion only decelerates—so utilize an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X1450S
- ✓ 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 SI40X1450S FAQ
Yes, the SI40X1450S is discontinued. The direct replacement is the AirTAC SAI40X1450S. It is dimensionally interchangeable per ISO 15552, matching the 40 mm bore, 1450 mm stroke, G1/4 port, and mounting fixtures perfectly.
This 40 mm bore double-acting cylinder features a G1/4 air port and M12x1.25 rod thread. It delivers 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 maximum theoretical force of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X1450S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X1450S replacement — usually within 7-8 hours.