This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1500S, 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 SI50X1500S
The AirTAC SI50 Standard Cylinder SI50X1500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1500S
- 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 SI50X1500S
The AirTAC SI50X1500S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 1500mm stroke, and a G1/4 port. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50X1500S. This direct successor matches the exact bore, stroke, force, port, and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and longevity. The original SI-SKU includes a magnet for CS1-B/DS1-B switches, while the SAI uses current AirTAC switches. Note this 1500mm stroke exceeds the 1200mm standard, requiring made-to-order production and external guides to prevent rod bending.
Airtac SI50 Standard Cylinder SI50X1500S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1500S |
| Bore size | Ø50 mm |
| Stroke | 1500 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 SAI50X1500S 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 SAI50X1500S 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 SI50X1500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1500 | 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 SI50X1500S Is Used
Long-Stroke Material Transfer
Pushes workpieces between processing stations over extended 1500mm distances, utilizing the 982 N thrust class effectively when paired with external linear guides.
Automated Assembly Ejection
Ejects completed assemblies from fixtures, relying on the 1374 N push force at 0.7 MPa to reliably clear the workspace before the next cycle.
Replacing the Airtac SI50 Standard Cylinder SI50X1500S with the SAI50X1500S
To replace the SI50X1500S, order the SAI50X1500S, confirming the ISO 15552 mounting interface, 50mm bore, 1500mm non-standard stroke, G1/4 port (PT/G/NPT thread), and mounting accessory. Because 1500mm exceeds the 1200mm max standard stroke, this is made-to-order; always use an external guide to prevent rod bending and side-load damage over this long distance. Sizing both ways: a neighbouring 63mm bore offers 1559 N push at 0.5 MPa, while a 40mm bore yields 628 N. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. The SAI family also adds the SAIF valve variant (bores 32-100).
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1500S
- ✓ 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 SI50X1500S FAQ
Yes, the SI50X1500S is discontinued. The direct replacement is the SAI50X1500S. It is dimensionally interchangeable per ISO 15552, matching the 50mm bore, 1500mm stroke, 982 N force, G1/4 port, and mounting interface for a seamless fixture swap.
The 50mm bore features a G1/4 air port and a 20mm rod. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa, with a theoretical max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1500S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1500S replacement — usually within 7-8 hours.