This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1120STC, 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 SI50X1120STC
The AirTAC SI50 Standard Cylinder SI50X1120STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1120mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1120STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1120 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1120STC
- 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 SI50X1120STC
The AirTAC SI50X1120STC is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore and 1120mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X1120STC, matching the exact bore, stroke, force, and TC trunnion mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL lock, SAIF valve, and BSAI clamp-lock variants the SI lacked. The built-in magnet supports CS1-B/DS1-B switches, while a Viton H seal option raises heat resistance to 150C.
Airtac SI50 Standard Cylinder SI50X1120STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1120STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1120STC |
| Bore size | Ø50 mm |
| Stroke | 1120 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 SAI50X1120STC 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 SAI50X1120STC 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 SI50X1120STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1120 | 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 SI50X1120STC Is Used
Long-Stroke Material Transfer
Drives 1120mm strokes to push heavy workpieces between conveyor stations, utilizing the 982N push force at 0.5MPa for reliable horizontal transit.
High-Reach Pallet Dispensing
Extends pallets or containers to elevated storage tiers, where the TC trunnion mount accommodates the pivotal movements required over long distances.
Automated Assembly Line Indexing
Shifts large subassemblies down a 1120mm production bed, relying on the 825N pull force at 0.5MPa to retract the tooling safely.
Replacing the Airtac SI50 Standard Cylinder SI50X1120STC with the SAI50X1120STC
To replace the SI50X1120STC, order the SAI50X1120STC. Confirm the ISO 15552 TC trunnion mount, 50mm bore, 1120mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors. Because this is a 1120mm stroke, external guides are recommended to prevent rod bending and side-load damage. For sizing, the 40mm neighbor bore offers 628N [email protected], while the 63mm bore yields 1559N. Note that a plain cylinder drifts without live air; the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1120STC
- ✓ 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 SI50X1120STC FAQ
Yes, the SI50X1120STC is discontinued. The direct replacement is the SAI50X1120STC. It shares the identical ISO 15552 mounting interface, 50mm bore, 1120mm stroke, output force, G1/4 port, and TC trunnion mount, fitting existing fixtures perfectly.
This double-acting cylinder uses a G1/4 air port. The thrust ratings are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1120STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1120STC replacement — usually within 7-8 hours.