This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX1000S, 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 SI50AX1000S
The AirTAC Airtac SI50 Standard Cylinder SI50AX1000S 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 SAI50AX1000S, 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 → SAI50AX1000S
- 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 SI50AX1000S
The AirTAC SI50AX1000S is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 1000 mm stroke. It delivers 982 N push force at 0.5 MPa and features a G1/4 air port. AirTAC replaced this legacy unit with the SAI50AX1000S, a direct upgrade retaining the exact interface, bore, stroke, force and mounting dimensions.
The SAI successor introduces an upgraded piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. The original SI50AX1000S used a SUS420J2 stainless steel rod (A suffix) for corrosion resistance, and its S magnet supported CS1-B/DS1-B sensors.
Airtac SI50 Standard Cylinder SI50AX1000S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX1000S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX1000S |
| 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 SAI50AX1000S 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 SAI50AX1000S 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 SI50AX1000S
| 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 SI50AX1000S Is Used
Long-Stroke Material Transfer
Drives goods across wide conveyor gaps with a 1000 mm extension, utilizing the 982 N push force to index heavy pallets reliably between machining centers.
Vertical Lift Gates
Elevates lightweight access doors or safety barriers up to 50 kg, benefiting from the SUS420J2 stainless rod for corrosion resistance in humid warehouse environments.
Multi-Station Indexing
Shifts tooling carriages down long linear rails between processing stations, relying on adjustable end cushions to decelerate the mass smoothly over the full stroke.
Replacing the Airtac SI50 Standard Cylinder SI50AX1000S with the SAI50AX1000S
To replace the SI50AX1000S, order the SAI50AX1000S. Verify your ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port thread (PT/G/NPT) and the built-in magnet for current AirTAC switches. Because this is a 1000 mm stroke, external guides are strongly recommended to prevent rod bending and excessive side loads. 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 provides 628 N. Note that a standard cylinder drifts without live air—the cushion only decelerates. For load holding, use an external pilot check valve or explore the SAIL or BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX1000S
- ✓ 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 SI50AX1000S FAQ
Yes, the SI50AX1000S is discontinued. The direct replacement is the AirTAC SAI50AX1000S. It is dimensionally interchangeable per ISO 15552, matching the 50 mm bore, 1000 mm stroke, 982 N force, G1/4 port and mounting interface, so it fits existing fixtures perfectly.
This double-acting cylinder operates at 0.15-1.0 MPa (proof 1.5 MPa) with a speed of 30-800 mm/s. Force outputs are: 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, 1767 N push at 0.9 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. It uses a G1/4 port, an M16x1.5 rod thread, and a 30 mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX1000S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX1000S replacement — usually within 7-8 hours.