This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1050STC, 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 SI50X1050STC
The AirTAC SI50 Standard Cylinder SI50X1050STC 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 SAI50X1050STC, 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 → SAI50X1050STC
- 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 SI50X1050STC
The AirTAC SI50X1050STC is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 1050mm stroke, and a TC trunnion mount. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50X1050STC. This direct upgrade shares the exact ISO 15552 mounting interface, G1/4 port, and stroke.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure. For load holding, note that air cushions only decelerate; use the SAIL lock or BSAI clamp-lock variant.
Airtac SI50 Standard Cylinder SI50X1050STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1050STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1050STC |
| 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 SAI50X1050STC 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 SAI50X1050STC 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 SI50X1050STC
| 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 SI50X1050STC Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with a 982 N push force, using the 1050mm stroke to reach distant lanes.
Automated Press Clamping
Secures workpieces with 825 N pull force at 0.5 MPa, utilizing TC trunnion mounting for pivoting alignment.
Replacing the Airtac SI50 Standard Cylinder SI50X1050STC with the SAI50X1050STC
To replace the SI50X1050STC, order the SAI50X1050STC keeping the 50mm bore, 1050mm stroke, TC trunnion mount, G1/4 port, and -S magnet for CS1-B/DS1-B sensors. If downsizing, a 40mm bore yields 628 N; if upsizing, a 63mm bore provides 1559 N at 0.5 MPa. Because this is a 1050mm stroke, use external guides to prevent rod bending and side loads. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variants, as cushions only decelerate.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1050STC
- ✓ 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 SI50X1050STC FAQ
Yes, the SI50X1050STC is discontinued. The direct replacement is the SAI50X1050STC, which shares the same ISO 15552 mounting interface, 50mm bore, 1050mm stroke, and G1/4 port.
It has a G1/4 port. Force ratings are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1050STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1050STC replacement — usually within 7-8 hours.