This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1050, 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 SI50X1050
The AirTAC Airtac SI50 Standard Cylinder SI50X1050 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1050mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1050, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1050 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1050
- 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 SI50X1050
The AirTAC SI50X1050 is a discontinued double-acting ISO 15552 profile cylinder with an extruded aluminum barrel and adjustable air cushions at both ends. It delivers a thrust of 982 N at 0.5 MPa through a 50 mm bore and 1050 mm stroke. Because this legacy unit is end-of-life, you should order the direct replacement: the SAI50X1050. It preserves the same ISO 15552 mounting interface, bore, stroke, output force, G1/4 port, and accessories, fitting directly into existing fixtures.
The SAI upgrade introduces a refined piston seal featuring two Y-shaped one-way elements for extended life and lower start-up pressure. For this non-magnet SKU, a position sensor cannot be fitted. The SAI family also adds SAIL, SAIF, and BSAI lock variants absent from the SI line.
Airtac SI50 Standard Cylinder SI50X1050 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1050 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1050 |
| Bore size | Ø50 mm |
| Stroke | 1050 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 SAI50X1050 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 SAI50X1050 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 SI50X1050
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1050 | 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 SI50X1050 Is Used
Long-Stroke Diversion
Pushes packages across transfer lines using the 1050 mm travel, relying on external guides to prevent rod bending during the extended reach.
Pallet Handling
Actuates stops and lifts within packaging zones, operating at speeds between 30-800 mm/s with a 50 mm bore generating 982 N thrust.
Replacing the Airtac SI50 Standard Cylinder SI50X1050 with the SAI50X1050
To replace the discontinued SI50X1050, order the SAI50X1050, verifying the ISO 15552 mounting interface, 50 mm bore, 1050 mm stroke, G1/4 port (PT/G/NPT thread options), and mounting accessory. Because this SKU lacks the -S magnet, it cannot accept a CS1-B or DS1-B sensor; if position detection is needed, select a magnet-equipped SAI. When sizing, note the 50 mm bore yields 982 N push and 825 N pull at 0.5 MPa, while the neighboring 63 mm bore offers 1559 N push at the same pressure. A plain cylinder does not hold load on air loss—the cushion only decelerates—so for load holding consider an external rod lock, a pilot check valve, or the SAIL/BSAI lock variant. Finally, at 1050 mm, this long stroke demands external guides to prevent rod bending and manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1050
- ✓ 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 SI50X1050 FAQ
Yes, the SI50X1050 is discontinued. The direct replacement is the SAI50X1050. It shares the identical ISO 15552 mounting interface, 50 mm bore, 1050 mm stroke, output force, G1/4 port, and mounting accessories, fitting seamlessly into existing machinery.
The 50 mm bore features a G1/4 air port and a 20 mm rod. It generates a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, and at 0.9 MPa it is 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1050
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1050 replacement — usually within 7-8 hours.