This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X700, 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 SI50X700
The AirTAC Airtac SI50 Standard Cylinder SI50X700 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 SAI50X700, 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 → SAI50X700
- 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 SI50X700
The AirTAC SI50X700 is a discontinued double-acting ISO 15552 profile cylinder with a 50 mm bore and 700 mm stroke. Delivering 982 N push force at 0.5 MPa, it is replaced by the SAI50X700. This direct successor shares the exact ISO 15552 mounting interface, G1/4 port, and M16x1.5 rod thread, fitting existing fixtures perfectly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike the CS1-B/DS1-B used on -S versions. For load holding, note that cushions only decelerate; use SAIL or BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X700 Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X700 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X700 |
| 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 SAI50X700 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 SAI50X700 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 SI50X700
| 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 SI50X700 Is Used
Long-Stroke Diversion
Pushes packages across a 700 mm conveyor lane using 982 N of thrust at 0.5 MPa, requiring external guides to prevent rod bending.
Automated Door Actuation
Opens large industrial machine guard doors over a 700 mm travel distance, relying on the 30 mm adjustable air cushions for smooth stops.
Replacing the Airtac SI50 Standard Cylinder SI50X700 with the SAI50X700
To replace the SI50X700, order the SAI50X700. Confirm the ISO 15552 mounting accessory (LB, FA, TC, etc.), the G1/4 port, and that this non-magnet model lacks sensing. Sizing both ways: a 63 mm bore offers 1559 N push at 0.5 MPa, while a 40 mm bore yields 628 N. For the 700 mm stroke, add external guides to prevent rod bending and side-load wear. The cushion only decelerates; for held loads, use an external pilot check valve or the SAIL/BSAI lock variants. The SAI family also adds the SAIF self-valve option.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X700
- ✓ 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 SI50X700 FAQ
Yes, the SI50X700 is discontinued. The direct replacement is the SAI50X700. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 700 mm stroke, G1/4 port, and mounting interface, but adds an upgraded piston seal.
The G1/4 port bore delivers 982 N push and 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. It operates at 30-800 mm/s with a 30 mm adjustable cushion at both ends.
Request a Quote for the SAI50X700
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X700 replacement — usually within 7-8 hours.