This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1150S, 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 SI50X1150S
The AirTAC SI50 Standard Cylinder SI50X1150S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1150mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1150S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1150 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1150S
- 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 SI50X1150S
The AirTAC SI50X1150S is a discontinued double-acting ISO 15552 profile cylinder featuring an extruded aluminum barrel, a built-in piston magnet, and a 1150 mm stroke. Delivering 982 N of push force at 0.5 MPa, it is replaced by the SAI50X1150S. This direct successor shares the exact G1/4 port, M16x1.5 rod thread, and mounting interface, fitting existing fixtures perfectly.
The SAI upgrade introduces a two-piece Y-shaped piston seal for low start-up pressure and extended life. The SAI family also adds the SAIL air-released lock and BSAI clamp-lock variants absent from the SI line, while retaining the CS1-B/DS1-B legacy sensor groove compatibility.
Airtac SI50 Standard Cylinder SI50X1150S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1150S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1150S |
| Bore size | Ø50 mm |
| Stroke | 1150 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 SAI50X1150S 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 SAI50X1150S 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 SI50X1150S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1150 | 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 SI50X1150S Is Used
Long-Stroke Material Transfer
Pushes workpieces between machining stations over a 1150 mm span, utilizing the 982 N push force at 0.5 MPa to move moderate payloads smoothly along an assembly line.
Ejector Mechanism Control
Drives long-travel ejection arms to clear finished parts from press beds, relying on the 30 mm adjustable air cushions at both ends to decelerate the rod gently.
Replacing the Airtac SI50 Standard Cylinder SI50X1150S with the SAI50X1150S
To replace the SI50X1150S, order the SAI50X1150S direct, verifying your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and the -S magnet for CS1-B/DS1-B switches. Sizing both ways: a 40 mm bore yields 628 N push @0.5 MPa, while a 63 mm bore yields 1559 N. A plain cylinder drifts on air loss—the cushion only decelerates—so use a pilot check valve or SAIL/BSAI lock variant for load holding. At 1150 mm, prevent rod bending by adding external guides to manage side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1150S
- ✓ 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 SI50X1150S FAQ
Yes, the SI50X1150S is discontinued. The direct replacement is the AirTAC SAI50X1150S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 1150 mm stroke, G1/4 port, and mounting interface, so it fits existing fixtures without modification.
This double-acting cylinder uses a G1/4 air port. At 0.5 MPa it provides 982 N push and 825 N pull force. 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 SAI50X1150S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1150S replacement — usually within 7-8 hours.