This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X110STC, 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 SI40X110STC
The AirTAC Airtac SI40 Standard Cylinder SI40X110STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 110mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X110STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke110 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X110STC
- 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 SI40X110STC
The AirTAC SI40X110STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 110mm stroke, delivering 628N push force at 0.5MPa. The direct replacement is the SAI40X110STC, which matches the original G1/4 port, M12x1.25 rod thread, and TC trunnion mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF, and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X110STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X110STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X110STC |
| Bore size | Ø40 mm |
| Stroke | 110 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 SAI40X110STC 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 SAI40X110STC 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 SI40X110STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×110 | 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 SI40X110STC Is Used
Package Diversion
Drives sorting gates on packaging lines where 628N push force at 0.5MPa easily redirects lightweight cartons at speeds up to 800mm/s.
Replacing the Airtac SI40 Standard Cylinder SI40X110STC with the SAI40X110STC
To replace the SI40X110STC, order the SAI40X110STC keeping the 40mm bore, 110mm stroke, TC trunnion mount, and -S magnet for CS1-B/DS1-B switches. The SAI uses current AirTAC switches. If you need more force, the 50mm bore offers 982N push at 0.5MPa; if less is needed, the 32mm bore gives 402N. A plain cylinder drifts on air loss—the cushion only decelerates—so use an external rod lock or pilot check valve for holding, or specify the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X110STC
- ✓ 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 SI40X110STC FAQ
Yes, the SI40X110STC is discontinued. The direct replacement is the SAI40X110STC. It is dimensionally interchangeable per ISO 15552, matching the 40mm bore, 110mm stroke, G1/4 port, and TC mounting interface.
The G1/4 port bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, 1130N at 0.9MPa, and a theoretical max of 128kgf at 1.0MPa. It operates at 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X110STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X110STC replacement — usually within 7-8 hours.