This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X180STC, 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 SI40X180STC
The AirTAC Airtac SI40 Standard Cylinder SI40X180STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 180mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40X180STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke180 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40X180STC
- 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 SI40X180STC
The AirTAC SI40X180STC is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 180mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X180STC, matching the exact TC trunnion mounting interface, output force, and dimensions.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The -S magnet works with legacy CS1-B/DS1-B sensors, while the SAI family adds SAIL lock and SAIF valve variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X180STC Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X180STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X180STC |
| Bore size | Ø40 mm |
| Stroke | 180 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 SAI40X180STC 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 SAI40X180STC 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 SI40X180STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×180 | 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 SI40X180STC Is Used
Package Diverting
Actuates routing gates on 40mm belt conveyors, providing reliable 628N push force to redirect parcels at sorting hubs.
Pallet Stopping
Controls gravity roller lane stops for mid-weight pallets, using the TC trunnion mount to handle side loads during deceleration.
Clamp Actuation
Drives medium-duty clamping fixtures on CNC machining lines, utilizing the 180mm stroke to clear the work zone for robotic loading.
Replacing the Airtac SI40 Standard Cylinder SI40X180STC with the SAI40X180STC
To replace the SI40X180STC, order the SAI40X180STC. Verify the ISO 15552 TC trunnion mount, 40mm bore, 180mm stroke, G1/4 port (PT/G/NPT thread), and the -S magnet for CS1-B/DS1-B switches. Sizing both ways: a 32mm bore yields 402N push at 0.5MPa, while a 50mm bore yields 982N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variant. At 180mm stroke, side-load and rod-bending risks are low, but ensure proper guide alignment to prevent seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X180STC
- ✓ 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 SI40X180STC FAQ
Yes, the SI40X180STC is discontinued. The direct replacement is the SAI40X180STC. It is dimensionally interchangeable per ISO 15552, retaining the same 40mm bore, 180mm stroke, G1/4 port, TC mounting, and output force.
The 40mm bore delivers 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and a theoretical max of 128kgf at 1.0MPa. Operating speed is 30-800mm/s. It features a 16mm rod, M12x1.25 thread, and 27mm adjustable cushions.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X180STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X180STC replacement — usually within 7-8 hours.