This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX700, 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 SI50AX700
The AirTAC Airtac SI50 Standard Cylinder SI50AX700 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 700mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX700, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX700
- 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 SI50AX700
The AirTAC SI50AX700 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 700 mm stroke. It delivers 982 N push and 825 N pull at 0.5 MPa, utilizing a G1/4 port and an M16x1.5 rod thread. AirTAC replaced this EOL unit with the SAI50AX700, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade features a revised piston seal using two Y-shaped one-way elements for low start-up pressure and extended life. Because this specific SKU lacks a magnet (-S), it cannot accept position sensors like the legacy CS1-B/DS1-B switches. The -A suffix denotes a SUS420J2 stainless steel piston rod for corrosion resistance.
Airtac SI50 Standard Cylinder SI50AX700 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX700 |
| Bore size | Ø50 mm |
| Stroke | 700 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 SAI50AX700 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 SAI50AX700 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 SI50AX700
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×700 | 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 SI50AX700 Is Used
Long-Stroke Diversion
Pushes packages or pallets across a 700 mm gap on material handling lines using the 982 N push force at 0.5 MPa.
Corrosive Environment Actuation
Leverages the SUS420J2 stainless rod option for reliable component shifting in humid or mildly corrosive industrial settings.
Replacing the Airtac SI50 Standard Cylinder SI50AX700 with the SAI50AX700
To replace the discontinued SI50AX700, order the SAI50AX700. Verify your ISO 15552 mounting accessory (LB foot, FA/FB flange, CA/CB clevis, or TC trunnion), the G1/4 air port, and the 700 mm stroke. Because this SKU has no -S suffix, it cannot support magnetic sensing; if position detection is needed, switch to an SAI50X700S model and use current AirTAC switches. When sizing, the 50 mm bore yields 982 N push at 0.5 MPa; neighboring bores offer 628 N (40 mm) or 1559 N (63 mm) at the same pressure. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve, rod lock, or the SAIL/BSAI lock variants. Finally, at 700 mm stroke, prevent rod bending by guiding the load externally to avoid side-load stress.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX700
- ✓ 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 SI50AX700 FAQ
Yes, the SI50AX700 is discontinued. The direct replacement is the SAI50AX700. It shares the exact ISO 15552 mounting interface, 50 mm bore, 700 mm stroke, G1/4 port, and output force, fitting existing fixtures directly.
This double-acting cylinder has a G1/4 port. It generates 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX700 replacement — usually within 7-8 hours.