This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1000, 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 SI50X1000
The AirTAC Airtac SI50 Standard Cylinder SI50X1000 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 SAI50X1000, 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 → SAI50X1000
- 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 SI50X1000
The AirTAC SI50X1000 is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1000mm stroke. It delivers a push force of 982 N at 0.5 MPa via a G1/4 port. AirTAC replaced this legacy unit with the SAI50X1000, a direct upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force, port and mounting accessories.
The SAI replacement features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Note this specific SKU lacks a magnet (-S), so it cannot accept CS1-B/DS1-B sensors. The SAI family also introduces SAIL, SAIF and BSAI lock variants absent in the SI line.
Airtac SI50 Standard Cylinder SI50X1000 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1000 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1000 |
| 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 SAI50X1000 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 SAI50X1000 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 SI50X1000
| 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 SI50X1000 Is Used
Long-Stroke Material Push
Ideal for diverting larger items across a 1000mm conveyor belt where the 982 N push force at 0.5 MPa easily overcomes carton friction.
Automated Door Actuation
Drives 1-meter sliding machinery doors or heavy blast gates, utilizing the adjustable 30mm air cushions at both ends to prevent end-cap slamming.
Replacing the Airtac SI50 Standard Cylinder SI50X1000 with the SAI50X1000
To replace the SI50X1000, order the SAI50X1000. Confirm the ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port, and the M16x1.5 rod thread. Because this SKU has no magnet, it cannot support position sensing; if you need switches, select an SAI50X1000S and use current AirTAC switches. For sizing, neighbouring bores are 40mm (628 N push @0.5 MPa) and 63mm (1559 N push @0.5 MPa). 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. Finally, at 1000mm stroke, prevent rod bending by guiding the load externally to avoid side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1000
- ✓ 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 SI50X1000 FAQ
Yes, the SI50X1000 is discontinued. The direct replacement is the AirTAC SAI50X1000. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 1000mm stroke, G1/4 port, and mounting interface, so it drops directly into existing fixtures.
This 50mm bore double-acting cylinder uses a G1/4 air port and an M16x1.5 rod thread. It generates a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa push is 1374 N, at 0.9 MPa it is 1767 N, and the theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1000
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1000 replacement — usually within 7-8 hours.