This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X840S, 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 SI80 Standard Air Cylinder SI80X840S
The AirTAC SI80 Standard Air Cylinder SI80X840S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 840mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X840S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke840 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X840S
- 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 SI80 Standard Air Cylinder SI80X840S
The AirTAC SI80X840S is a discontinued double-acting ISO 15552 profile cylinder featuring an 80 mm bore and 840 mm stroke. Delivering 2513 N push force at 0.5 MPa, it is directly replaced by the SAI80X840S direct equivalent. The SAI upgrade utilizes two Y-shaped one-way piston seal elements for lower start-up pressure and longer life, while keeping the G3/8 port, M20x1.5 rod thread, and 36 mm cushions unchanged.
This -S SKU includes a piston magnet for legacy CS1-B/DS1-B sensors. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the legacy line.
Airtac SI80 Standard Air Cylinder SI80X840S Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X840S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X840S |
| Bore size | Ø80 mm |
| Stroke | 840 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI80X840S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The SAI80X840S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI80 Standard Air Cylinder SI80X840S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×840 | 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 SI80 Standard Air Cylinder SI80X840S Is Used
Long-Stroke Diversion
Pushes heavy pallets across transfer lines using the 840 mm stroke and 2513 N force, requiring external guides to prevent rod bending.
Large Press Ejection
Cycles large formed parts out of machinery beds, utilizing the 36 mm adjustable air cushions to decelerate at stroke end.
Replacing the Airtac SI80 Standard Air Cylinder SI80X840S with the SAI80X840S
To replace the SI80X840S, order the SAI80X840S to retain the exact ISO 15552 mounting interface, 80 mm bore, 840 mm stroke, and G3/8 port. Confirm your thread standard (PT, G, or NPT) and mounting accessory (LB, FA, TC, etc.). The -S suffix means a magnet is present for CS1-B/DS1-B switches; the SAI replacement uses current AirTAC switches. You can size down to a 63 mm bore (1559 N push) or up to a 100 mm bore (3927 N push). Because the stroke is 840 mm, use an external guide to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use the SAIL or BSAI lock variant, or an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X840S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI80 Standard Air Cylinder SI80X840S FAQ
Yes, the SI80X840S is discontinued. The direct replacement is the SAI80X840S. It shares the same ISO 15552 mounting interface, 80 mm bore, 840 mm stroke, output force, and G3/8 port, fitting existing fixtures perfectly.
The 80 mm bore delivers 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, and a maximum theoretical force of 513 kgf at 1.0 MPa. Operating speed is 30-800 mm/s, with a G3/8 air port.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X840S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X840S replacement — usually within 7-8 hours.