This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI80X250LB, 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 SI80X250LB
The AirTAC SI80 Standard Air Cylinder SI80X250LB is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 250mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI80X250LB, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke250 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → SAI80X250LB
- 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 SI80X250LB
The AirTAC SI80X250LB is a discontinued double-acting ISO 15552 profile cylinder with an 80 mm bore and 250 mm stroke. It delivers 2513 N push and 2268 N pull at 0.5 MPa, operating via a G3/8 port. The direct replacement is the SAI80X250LB, which retains the identical LB foot mounting, M20x1.5 rod thread, and 36 mm cushions.
Because this specific SKU lacks the -S magnet, it cannot accept a position sensor. The SAI upgrade introduces a two Y-shaped one-way piston seal for lower start-up pressure and longer life. For high heat, Viton H seals extend operation to 150 C.
Airtac SI80 Standard Air Cylinder SI80X250LB Technical Specifications
| Model | Airtac SI80 Standard Air Cylinder SI80X250LB |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI80X250LB |
| Bore size | Ø80 mm |
| Stroke | 250 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 SAI80X250LB 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 SAI80X250LB 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 SI80X250LB
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×250 | 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 SI80X250LB Is Used
Pallet Diversion
Pushes heavy pallets sideways off a main conveyor line using the 2513 N thrust at 0.5 MPa, absorbing end-of-stroke impact via the 36 mm adjustable cushion.
Press Ejection
Ejects formed metal parts from a press bed, using the LB foot mount to secure the body against the 2268 N pull force during rapid 30-800 mm/s retraction.
Replacing the Airtac SI80 Standard Air Cylinder SI80X250LB with the SAI80X250LB
To replace the SI80X250LB, order the SAI80X250LB and confirm the ISO 15552 LB foot mount, 250 mm stroke, and G3/8 port. This SKU has no magnet (-S), so it cannot support legacy CS1-B/DS1-B sensors; order a magnet-equipped SAI if sensing is needed. At 0.5 MPa it yields 2513 N push; sizing down, a 63 mm bore gives 1559 N, while an 100 mm bore provides 3927 N. Since the stroke is 250 mm, guide external rods to prevent side-loading and rod bending. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve, or select the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI80X250LB
- ✓ 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 SI80X250LB FAQ
Yes, the SI80X250LB is discontinued. The direct replacement is the SAI80X250LB. It is dimensionally interchangeable per ISO 15552, matching the 80 mm bore, 250 mm stroke, G3/8 port, LB foot mount, and output force.
The 80 mm bore features a G3/8 port and M20x1.5 rod. It generates 2513 N push and 2268 N pull at 0.5 MPa, 3518 N push at 0.7 MPa, 4523 N push at 0.9 MPa, and a theoretical max of 513 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI80X250LB
Send us the quantity and destination. We confirm price, stock and lead time on the SAI80X250LB replacement — usually within 7-8 hours.