This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X180H, 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 SI40X180H
The AirTAC Airtac SI40 Standard Cylinder SI40X180H 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 SAI40X180H, 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 → SAI40X180H
- 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 SI40X180H
The AirTAC SI40X180H 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 SAI40X180H, matching the exact interface, force, and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. This -H variant uses Viton seals for 0-150C. Being a no-S SKU, it cannot take a sensor.
Airtac SI40 Standard Cylinder SI40X180H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X180H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X180H |
| 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 SAI40X180H 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 SAI40X180H 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 SI40X180H
| 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 SI40X180H Is Used
High-Temperature Ejection
Ideal for pushing parts out of hot molds using the Viton -H seal rated for 0-150C, leveraging the 628N push force at 0.5MPa.
Heat-Resistant Diversion
Diverts warm packages along a line, where the 180mm stroke and robust G1/4 port provide steady 30-800mm/s cycling.
Medium-Force Clamping
Clamps workpieces in heated welding cells, safely holding loads up to 377N without drift when paired with a check valve.
Replacing the Airtac SI40 Standard Cylinder SI40X180H with the SAI40X180H
To replace the SI40X180H, order the SAI40X180H. Confirm the ISO 15552 mounting fixture, 180mm stroke, G1/4 port, and Viton -H high-temperature seal. If you need more force, the adjacent 50mm bore yields 982N push at 0.5MPa; if less is acceptable, the 32mm bore gives 402N. For load holding, note that a plain cylinder drifts on air loss as the cushion only decelerates. Use an external pilot check valve or the SAIL/BSAI lock variants. Since the 180mm stroke is under 300mm, severe rod-bending side loads are minimal, but standard guide rules still apply.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X180H
- ✓ 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 SI40X180H FAQ
Yes, the SI40X180H is discontinued. The direct replacement is the SAI40X180H. It is dimensionally interchangeable per ISO 15552, keeping the same 40mm bore, 180mm stroke, 628N force, and G1/4 port.
The G1/4 port feeds a 40mm bore yielding 628N push and 528N pull at 0.5MPa, 879N push at 0.7MPa, and a theoretical max of 128kgf at 1.0MPa. The -H seal allows 0-150C operation.
Related AirTAC SAI Cylinders
Request a Quote for the SAI40X180H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X180H replacement — usually within 7-8 hours.