This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X580, 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 SI40X580
The AirTAC Airtac SI40 Standard Cylinder SI40X580 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 580mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X580, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke580 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X580
- 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 SI40X580
The AirTAC SI40X580 is a discontinued double-acting ISO 15552 profile cylinder with a 580 mm stroke. It delivers a push force of 628 N at 0.5 MPa, utilizing a G1/4 air port and an M12x1.25 rod thread. Because this exact SKU lacks the -S magnet suffix, it cannot accept a magnetic position switch. AirTAC replaced the SI line with the SAI family, making SAI40X580 the direct replacement. It shares the identical ISO 15552 mounting interface, bore, stroke, output force, port size, and accessories, dropping directly into existing fixtures.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also expands functionality with SAIL air-released lock, SAIF integrated 4M valve, and BSAI clamp-lock variants that the legacy SI range lacked.
Airtac SI40 Standard Cylinder SI40X580 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X580 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X580 |
| Bore size | Ø40 mm |
| Stroke | 580 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 SAI40X580 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 SAI40X580 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 SI40X580
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×580 | 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 SI40X580 Is Used
Material Diversion
Actuates routing gates on packaging lines, using the 580 mm stroke to shift products between parallel belts with 628 N of push force.
Long-Reach Ejection
Pushes machined parts out of an enclosed CNC workspace, requiring external guide rails to prevent rod bending over the 580 mm extension.
Replacing the Airtac SI40 Standard Cylinder SI40X580 with the SAI40X580
To replace the discontinued SI40X580, order the SAI40X580. Confirm your ISO 15552 mounting accessory (LB foot, FA flange, or TC trunnion), the G1/4 port thread (PT, G, or NPT), and the 580 mm stroke. This non-magnetic SKU cannot support sensors; if position detection is needed, order an SAI40X580S and use current AirTAC switches. Sizing both ways: the 40 mm bore gives 628 N push at 0.5 MPa, while the neighboring 50 mm bore offers 982 N if your system needs more force. Because the 580 mm stroke exceeds 300 mm, use an external guide to prevent rod bending and side-load damage. A plain cylinder does not hold load on air loss—the cushion only decelerates. For load holding, specify the SAIL lock variant, BSAI clamp-lock, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X580
- ✓ 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 SI40X580 FAQ
Yes, the SI40X580 is discontinued. The direct replacement is the AirTAC SAI40X580. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 580 mm stroke, 628 N force, G1/4 port, and mounting interface.
At 0.5 MPa it provides 628 N push and 528 N pull. At 0.7 MPa push is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, speed is 30-800 mm/s, and it uses a G1/4 port.
Request a Quote for the SAI40X580
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X580 replacement — usually within 7-8 hours.