This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX1000SH, 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 SI50AX1000SH
The AirTAC SI50 Standard Cylinder SI50AX1000SH 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 SAI50AX1000SH, 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 → SAI50AX1000SH
- 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 SI50AX1000SH
The AirTAC SI50AX1000SH is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, SUS420J2 stainless rod, and Viton H high-temperature seals. Generating 982 N push at 0.5 MPa, it is replaced by the SAI50AX1000SH direct. This upgrade retains the G1/4 port and M16x1.5 thread but adds a two Y-shaped one-way piston seal for low start-up pressure. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line.
The -S magnet works with legacy CS1-B/DS1-B sensors, while the -H Viton seal extends operation to 0-150 C. Note that plain cylinders drift without live air; use an external rod lock or SAIL/BSAI variant for holding.
Airtac SI50 Standard Cylinder SI50AX1000SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX1000SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX1000SH |
| 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 SAI50AX1000SH 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 SAI50AX1000SH 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 SI50AX1000SH
| 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 SI50AX1000SH Is Used
High-Temp Ejection
Ejects molded parts on a 1000mm cycle using the SUS420J2 rod and Viton H seals to survive 0-150 C ambient heat near the press.
Long-Stroke Transfer
Pushes heavy workpieces between conveyor stations, relying on the 982 N thrust at 0.5 MPa and adjustable end cushions.
Replacing the Airtac SI50 Standard Cylinder SI50AX1000SH with the SAI50AX1000SH
To replace the discontinued SI50AX1000SH, order the SAI50AX1000SH, matching the 50mm bore, 1000mm stroke, G1/4 port, M16x1.5 thread, and ISO 15552 mounting interface. Confirm the -S magnet for current AirTAC switches, the -A SUS420J2 rod, and -H Viton seals. If you need more force, the 63mm bore offers 1559 N push at 0.5 MPa; if less, the 40mm bore provides 628 N. Because this is a 1000mm stroke, prevent rod bending by using an external guide to absorb side loads. The air cushion only decelerates; it does not hold position. For load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX1000SH
- ✓ 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 SI50AX1000SH FAQ
Yes, the SI50AX1000SH is discontinued. The direct replacement is the SAI50AX1000SH. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 1000mm stroke, G1/4 port, and mounting interface.
The 50mm bore features a G1/4 port. It delivers 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 max of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX1000SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX1000SH replacement — usually within 7-8 hours.