This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX700S, 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 SI50AX700S
The AirTAC Airtac SI50 Standard Cylinder SI50AX700S 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 SAI50AX700S, 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 → SAI50AX700S
- 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 SI50AX700S
The AirTAC SI50AX700S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore, 700mm stroke, and an SUS420J2 stainless steel rod. It delivers 982 N push and 825 N pull at 0.5 MPa via a G1/4 port. The direct replacement is the SAI50AX700S, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure. The -S magnet works with legacy CS1-B/DS1-B sensors, while Viton H seals allow 0-150 C operation.
Airtac SI50 Standard Cylinder SI50AX700S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX700S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX700S |
| 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 SAI50AX700S 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 SAI50AX700S 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 SI50AX700S
| 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 SI50AX700S Is Used
Long-Stroke Diversion
Pushes packages across transfer lines with 982 N force, requiring external guides to manage the 700mm stroke side-load.
Stainless Rod Washdown
Uses the SUS420J2 rod for corrosion resistance in damp sorting environments, easily swapped to the SAI equivalent.
Replacing the Airtac SI50 Standard Cylinder SI50AX700S with the SAI50AX700S
To replace the SI50AX700S, order the SAI50AX700S. Verify the ISO 15552 mounting interface, 50mm bore, 700mm stroke, G1/4 port, and M16x1.5 rod thread. The -A suffix denotes the SUS420J2 stainless rod, and -S indicates the magnet for CS1-B/DS1-B switches. If you need more force, the 63mm bore offers 1559 N push at 0.5 MPa; if less is needed, the 40mm bore provides 628 N. For the 700mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX700S
- ✓ 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 SI50AX700S FAQ
Yes, the SI50AX700S is discontinued. The direct replacement is the SAI50AX700S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 700mm stroke, force, G1/4 port, and mounting fixtures.
It features a G1/4 air port and provides 982 N push / 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical max of 200 kgf at 1.0 MPa. The SAI replacement upgrades the seal but keeps these exact ratings.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX700S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX700S replacement — usually within 7-8 hours.