This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1000STC, 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 SI50X1000STC
The AirTAC SI50 Standard Cylinder SI50X1000STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1000mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1000STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1000 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1000STC
- 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 SI50X1000STC
The AirTAC SI50X1000STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1000mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X1000STC, matching the interface, stroke, force, port and TC trunnion mount exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. The SAI family also adds SAIL, SAIF and BSAI lock variants the SI lacked. Your -S magnet works with legacy CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50X1000STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1000STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1000STC |
| Bore size | Ø50 mm |
| Stroke | 1000 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 SAI50X1000STC 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 SAI50X1000STC 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 SI50X1000STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1000 | 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 SI50X1000STC Is Used
Long-Stroke Diversion
Pushes packages across a 1-meter conveyor lane using the 982N @0.5MPa thrust and TC trunnion mount to pivot smoothly.
Material Transfer Arm
Shifts lightweight billets between stations, requiring external guides to manage side-load over the 1-meter travel.
Replacing the Airtac SI50 Standard Cylinder SI50X1000STC with the SAI50X1000STC
To replace the SI50X1000STC, order the SAI50X1000STC. Confirm the ISO 15552 TC trunnion interface, 50mm bore, 1000mm stroke, G1/4 port and -S magnet. Sizing both ways: a 63mm bore gives 1559N push at 0.5MPa, while dropping to 40mm yields 628N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Because the 1000mm stroke is long, use external guides to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1000STC
- ✓ 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 SI50X1000STC FAQ
Yes, the SI50X1000STC is discontinued. The direct replacement is the SAI50X1000STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 1000mm stroke, G1/4 port, TC mount and 982N force.
It has a G1/4 port, M16x1.5 rod thread and 30mm cushions. Forces are: 982N push / 825N pull @0.5MPa, 1374N push @0.7MPa, 1767N push @0.9MPa, and a 200kgf max @1.0MPa. Speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1000STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1000STC replacement — usually within 7-8 hours.