This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X65S, 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 SI40X65S
The AirTAC Airtac SI40 Standard Cylinder SI40X65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X65S
- 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 SI40X65S
The AirTAC SI40X65S is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 65mm stroke. Delivering 628N push force at 0.5MPa, it features a G1/4 port and a built-in piston magnet for CS1-B/DS1-B switches. AirTAC replaced this with the SAI40X65S, a direct sharing the same interface, force, and mounting.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The SAI family also adds SAIL, SAIF, and BSAI variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40X65S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X65S |
| Bore size | Ø40 mm |
| Stroke | 65 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 SAI40X65S 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 SAI40X65S 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 SI40X65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 SI40X65S Is Used
Small Parts Clamping
Ideal for holding light machined components during drilling or milling, utilizing the 628N push force within compact machining centers.
Package Diverting
Executes 65mm strokes to push small cartons off a main conveyor line, relying on the 32kg safe vertical lift margin for reliable transfer.
Stopper Gate Actuation
Deploys a pneumatic stop gate to regulate product flow on roller conveyors, benefiting from the adjustable 27mm air cushions at both ends.
Replacing the Airtac SI40 Standard Cylinder SI40X65S with the SAI40X65S
To replace this SI40X65S, order the SAI40X65S and confirm the ISO 15552 mounting interface, 65mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. The -S magnet equates to legacy CS1-B/DS1-B sensors, which swap to current AirTAC switches on the SAI. If you need more force, the neighbouring 50mm bore offers 982N push at 0.5MPa; if less is required, the 32mm bore provides 402N. Remember, a standard cylinder drifts without live air—the cushion only decelerates. For load holding, specify an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X65S
- ✓ 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 SI40X65S FAQ
Yes, the AirTAC SI40X65S is discontinued. The direct replacement is the SAI40X65S. It is dimensionally interchangeable per ISO 15552, retaining the exact same 40mm bore, 65mm stroke, output force, G1/4 port, and mounting fixtures.
The 40mm bore provides 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N push at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. Operating speed is 30-800 mm/s. It uses a G1/4 port and a M12x1.25 rod thread.
Request a Quote for the SAI40X65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X65S replacement — usually within 7-8 hours.