This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80H, 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 SI40X80H
The AirTAC SI40 Standard Cylinder SI40X80H 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 SAI40X80H, 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 → SAI40X80H
- 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 SI40X80H
The AirTAC SI40X80H is a discontinued double-acting ISO 15552 profile cylinder with a 40mm bore and 80mm stroke. It delivers 628N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI40X80H, matching the exact bore, stroke, force, port and ISO 15552 mounting interface for seamless fixture integration.
This specific SKU features a Viton H seal for high-temperature environments (0 to 150C) and lacks a magnet, meaning it cannot accept position sensors. The SAI upgrade introduces a two-piece Y-shaped piston seal for low start-up pressure.
Airtac SI40 Standard Cylinder SI40X80H Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80H |
| 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 SAI40X80H 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 SAI40X80H 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 SI40X80H
| 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 SI40X80H Is Used
Clamp Actuation
Provides reliable 628N clamping force for moderate-duty machining fixtures operating at 0.5 MPa.
Package Diverting
Drives short 80mm stroke diverting arms to route boxes on production lines without occupying excessive space.
Gate Pushing
Actuates lightweight access doors or material gates where a compact 40mm bore and high-temp Viton H seal are required.
Replacing the Airtac SI40 Standard Cylinder SI40X80H with the SAI40X80H
To replace the SI40X80H, order the SAI40X80H and confirm the ISO 15552 mounting interface, G1/4 port, and 80mm stroke. Because this is a no-S (non-magnet) SKU, it cannot support legacy CS1-B/DS1-B sensors; if sensing is required, specify an SAI with a magnet. For load holding, note that a plain cylinder drifts on air loss—the cushion only decelerates—so use an external pilot check valve or the SAIL/BSAI lock variant. If downsizing to a 32mm bore yields 402N push at 0.5MPa, while an 80mm bore offers 2513N; the 40mm strikes a balance for moderate loads. The 80mm stroke is short enough to avoid rod-bending side-load issues.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80H
- ✓ 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 SI40X80H FAQ
Yes, the SI40X80H is discontinued. The direct replacement is the SAI40X80H, which shares the same ISO 15552 mounting interface, 40mm bore, 80mm stroke, force, and G1/4 port, fitting directly into existing setups.
It features a G1/4 air port. The force ratings are: 628N push and 528N pull at 0.5 MPa, 879N push at 0.7 MPa, 1130N push at 0.9 MPa, and a theoretical maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X80H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80H replacement — usually within 7-8 hours.