This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1500STC, 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 SI50X1500STC
The AirTAC SI50 Standard Cylinder SI50X1500STC 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 SAI50X1500STC, 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 → SAI50X1500STC
- 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 SI50X1500STC
The AirTAC SI50X1500STC is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore, delivering 982 N push force at 0.5 MPa via a G1/4 port. Because this 1500 mm stroke exceeds the 1200 mm standard maximum for this bore, it was produced as a non-standard, made-to-order unit with a TC trunnion mount and a built-in magnet for CS1-B/DS1-B sensors.
You can replace it directly with the SAI50X1500STC. This current-production direct maintains the exact ISO 15552 mounting interface, bore, stroke, force and port. The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. If you need load holding on air loss, explore the SAIL or BSAI lock variants, as standard cushions only decelerate.
Airtac SI50 Standard Cylinder SI50X1500STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1500STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1500STC |
| 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 SAI50X1500STC 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 SAI50X1500STC 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 SI50X1500STC
| 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 SI50X1500STC Is Used
Long-Stroke Material Transfer
Drives goods across wide conveyor gaps with a 1500 mm reach, yielding a safe 589 N working load for automated transit lines.
High-Bay Pusher Arm
Actuates storage pushers using a 50 kg vertical lift capacity, requiring external guides to manage rod bending over the long stroke.
Pallet Positioning Gate
Shifts pallet routing gates with 982 N of thrust at 0.5 MPa, utilizing the TC trunnion mount for pivoting alignment.
Replacing the Airtac SI50 Standard Cylinder SI50X1500STC with the SAI50X1500STC
To replace the SI50X1500STC, order the SAI50X1500STC and confirm the ISO 15552 TC trunnion interface, 50 mm bore, 1500 mm non-standard stroke, G1/4 port, and the -S magnet for current AirTAC switches. If you need more force, the neighbouring 63 mm bore yields 1559 N at 0.5 MPa; if less is required, the 40 mm bore gives 628 N. Because this is a 1500 mm stroke, external guides are strongly recommended to prevent rod bending and side-load damage. A plain cylinder will not hold a load without live air—the cushion only decelerates—so use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding. The SAI family also adds the SAIF self-valve option the SI lacked.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1500STC
- ✓ 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 SI50X1500STC FAQ
Yes, the SI50X1500STC is discontinued. The direct replacement is the SAI50X1500STC. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 1500 mm stroke, G1/4 port, TC mount, and 982 N force for existing fixtures.
This double-acting cylinder uses a G1/4 air port and provides 982 N push and 825 N pull at 0.5 MPa. At 0.7 MPa it pushes 1374 N, and at 0.9 MPa it pushes 1767 N. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1500STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1500STC replacement — usually within 7-8 hours.