This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1080S, 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 SI50 Standard Cylinder SI50X1080S
The AirTAC Airtac SI50 Standard Cylinder SI50X1080S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1080mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1080S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1080 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1080S
- 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 SI50 Standard Cylinder SI50X1080S
The AirTAC SI50X1080S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1080mm stroke, delivering 982N push force at 0.5MPa through a G1/4 port. AirTAC replaced it with the SAI50X1080S, a direct sharing the exact interface, bore, stroke, force and mounting.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. The SAI family adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B switches, though SAI uses current AirTAC sensors.
Airtac SI50 Standard Cylinder SI50X1080S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1080S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1080S |
| Bore size | Ø50 mm |
| Stroke | 1080 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X1080S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X1080S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X1080S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1080 | 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 SI50 Standard Cylinder SI50X1080S Is Used
Long-Stroke Diverting
Drives sorting gates across wide conveyor belts where the 1080mm travel and 982N force at 0.5MPa are required to push heavy parcels into outbound lanes.
Pallet Push-Off
Acts as a sweep arm in end-of-line palletizing, using the 50mm bore to shift packaged goods off accumulation rollers before stretch wrapping.
Replacing the Airtac SI50 Standard Cylinder SI50X1080S with the SAI50X1080S
To replace the SI50X1080S, order the SAI50X1080S keeping the exact 50mm bore, 1080mm stroke, G1/4 port, M16x1.5 rod thread and ISO 15552 mounting. Confirm your thread standard (PT/G/NPT) and mounting accessory (LB, FA, TC, etc.). The 1080mm stroke exceeds typical lengths, so use external guides to prevent rod bending and side-load wear. Sizing both ways: a 63mm bore yields 1559N push at 0.5MPa, while dropping to 40mm gives 628N. A plain cylinder drifts on air loss (cushions only decelerate), so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1080S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X1080S FAQ
Yes, the SI50X1080S is discontinued. The direct replacement is the SAI50X1080S. It shares the identical ISO 15552 mounting interface, 50mm bore, 1080mm stroke, output force, G1/4 port and accessories, fitting directly into existing fixtures.
The G1/4 port bore delivers a push force of 982N and pull of 825N at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. It operates at 30-800mm/s with a 30mm adjustable air cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1080S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1080S replacement — usually within 7-8 hours.