This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X600N, 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 SI40X600N
The AirTAC Airtac SI40 Standard Cylinder SI40X600N is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 600mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X600N, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke600 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X600N
- 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 SI40X600N
The AirTAC SI40X600N is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 600mm stroke. Delivering 628 N push force at 0.5 MPa, it is replaced by the SAI40X600N. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and output force, fitting existing fixtures perfectly.
The SAI upgrade features a new piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This SKU uses an NBR (-N) seal for -20 to +70 C, and lacks a magnet (-S) so it cannot take a sensor. For load holding, note the air cushion only decelerates; use a pilot check valve.
Airtac SI40 Standard Cylinder SI40X600N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X600N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X600N |
| Bore size | Ø40 mm |
| Stroke | 600 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 SAI40X600N 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 SAI40X600N 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 SI40X600N
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×600 | 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 SI40X600N Is Used
Material Ejection
Cycles at 30-800 mm/s to eject machined parts from a fixture, relying on the NBR seals for standard -20 to +70 C operation.
Replacing the Airtac SI40 Standard Cylinder SI40X600N with the SAI40X600N
To replace this SI40X600N, order the SAI40X600N. Verify the ISO 15552 mounting interface, 40mm bore, 600mm stroke, G1/4 port, and NBR seals. Because this is a no-S SKU, it cannot accept a magnetic sensor; if sensing is needed, order an SAI40X600S. Sizing both ways: a 32mm bore yields 402 N push at 0.5 MPa, while a 50mm bore yields 982 N. For the 600mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for held loads, use an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X600N
- ✓ 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 SI40X600N FAQ
Yes, the SI40X600N is discontinued. The direct replacement is the SAI40X600N. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 600mm stroke, G1/4 port, and mounting interface.
This 40mm bore cylinder has a G1/4 air port. Theoretical forces 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 maximum of 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X600N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X600N replacement — usually within 7-8 hours.