This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80S, 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 SI40X80S
The AirTAC Airtac SI40 Standard Cylinder SI40X80S 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 SAI40X80S, 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 → SAI40X80S
- 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 SI40X80S
The AirTAC SI40X80S is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke. Delivering 628 N push force at 0.5 MPa, it features a G1/4 air port, a Ø16 mm rod, and M12x1.25 rod threading. The direct replacement is the SAI40X80S, matching the exact bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. For applications needing load holding, the SAI family adds SAIL and BSAI lock variants the SI lacked.
Airtac SI40 Standard Cylinder SI40X80S Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80S |
| 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 SAI40X80S 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 SAI40X80S 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 SI40X80S
| 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 SI40X80S Is Used
Component Clamping
Secures mid-weight machined parts during milling or drilling, utilizing the 628 N push force to hold firm against cutting vibration.
Package Diverting
Actuates a 80 mm stroke diverting arm to push cartons off a main production line onto a secondary packing belt.
Pallet Stopper
Deploys a pneumatic stop gate to halt incoming pallets at a specific workstation, retracting to release them on command.
Replacing the Airtac SI40 Standard Cylinder SI40X80S with the SAI40X80S
To replace the SI40X80S, order the SAI40X80S. Confirm the ISO 15552 mounting interface, the G1/4 port, your PT/G/NPT thread standard, and the -S magnet for CS1-B/DS1-B legacy switches (the SAI uses current AirTAC switches). For sizing, a neighbouring 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore provides 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For held loads, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80S
- ✓ 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 SI40X80S FAQ
Yes, the SI40X80S is discontinued. The direct replacement is the SAI40X80S. It is dimensionally interchangeable per ISO 15552, keeping the same 40 mm bore, 80 mm stroke, 628 N force, G1/4 port, and mounting fixtures.
The G1/4 port bore delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X80S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80S replacement — usually within 7-8 hours.