This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80STC, 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 SI40X80STC
The AirTAC Airtac SI40 Standard Cylinder SI40X80STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 80mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X80STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke80 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X80STC
- 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 SI40X80STC
The AirTAC SI40X80STC is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and a G1/4 port. It delivers a push force of 628 N at 0.5 MPa. AirTAC replaced this legacy unit with the SAI40X80STC, a direct replacement retaining the exact bore, stroke, force, port, and TC trunnion mounting interface.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and long life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
Airtac SI40 Standard Cylinder SI40X80STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80STC |
| Bore size | Ø40 mm |
| Stroke | 80 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 SAI40X80STC 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 SAI40X80STC 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 SI40X80STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 SI40X80STC Is Used
Package Diverting
Drives diverter arms on packaging lines using its 80 mm stroke and 628 N push force to redirect cartons at high speeds.
Clamp Actuation
Secures medium-duty workpieces during machining, utilizing the TC trunnion mount to accommodate angular alignment.
Replacing the Airtac SI40 Standard Cylinder SI40X80STC with the SAI40X80STC
To replace the SI40X80STC, order the SAI40X80STC. Verify the ISO 15552 TC trunnion mounting, 40 mm bore, 80 mm stroke, G1/4 port, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). For sizing, this bore yields 628 N push at 0.5 MPa; a neighboring 32 mm bore offers 402 N, while a 50 mm bore provides 982 N. Note that a plain cylinder drifts on air loss since the cushion only decelerates; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80STC
- ✓ 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 SI40X80STC FAQ
Yes, the SI40X80STC is discontinued. The direct replacement is the SAI40X80STC. It is dimensionally interchangeable per ISO 15552, matching the bore, stroke, force, G1/4 port, and TC mounting interface.
This double-acting cylinder has a G1/4 port. It generates a push force of 628 N and a pull force of 528 N at 0.5 MPa. At 0.7 MPa the push force is 879 N, and at 0.9 MPa it is 1130 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X80STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80STC replacement — usually within 7-8 hours.