This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40X80N, 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 SI40X80N
The AirTAC Airtac SI40 Standard Cylinder SI40X80N 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 SAI40X80N, 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 → SAI40X80N
- 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 SI40X80N
The AirTAC SI40X80N is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm stroke and 40 mm bore. It delivers 628 N push force at 0.5 MPa via a G1/4 port. The direct replacement is the SAI40X80N, matching the interface, stroke and force exactly.
Because this SKU lacks the -S magnet, it cannot accept a position sensor. The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure. The NBR seal suits -20 to +70 C; Viton H extends this to 150 C.
Airtac SI40 Standard Cylinder SI40X80N Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40X80N |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40X80N |
| 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 SAI40X80N 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 SAI40X80N 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 SI40X80N
| 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 SI40X80N Is Used
Small Part Ejection
Uses the 628 N push force at 0.5 MPa to reliably knock lightweight molded parts out of a fixture during an automated press cycle.
Package Diverting
Executes an 80 mm rapid stroke to push small cartons off a main packaging line onto a secondary sorting belt at speed.
Clamp Actuation
Secures workpieces in a light-duty machining jig, benefiting from the adjustable 27 mm air cushions to soften end-of-stroke impact.
Replacing the Airtac SI40 Standard Cylinder SI40X80N with the SAI40X80N
To replace the SI40X80N, order the SAI40X80N. Verify your ISO 15552 mounting accessory (LB, FA, TC) and the G1/4 port. This non-magnet SKU cannot fit a sensor; if switching is needed, specify the SAI with an S suffix for CS1-B/DS1-B compatibility. If undersized, the 50 mm bore offers 982 N. Note that a plain cylinder drifts on air loss; for load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The 80 mm stroke keeps rod bending risk low.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40X80N
- ✓ 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 SI40X80N FAQ
Yes, the SI40X80N is discontinued. The direct replacement is the SAI40X80N. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 80 mm stroke, output force, G1/4 port and mounting interface.
This double-acting cylinder uses a G1/4 air port. Force outputs are: 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 maximum of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40X80N
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40X80N replacement — usually within 7-8 hours.