This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX65S, 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 SI50AX65S
The AirTAC Airtac SI50 Standard Cylinder SI50AX65S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 65mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX65S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke65 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX65S
- 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 SI50AX65S
The AirTAC SI50AX65S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 65mm stroke. Generating 982 N push force at 0.5 MPa, it features a G1/4 port, M16x1.5 rod thread, and a built-in magnet for CS1-B/DS1-B sensors. The SUS420J2 stainless rod option provides corrosion resistance.
AirTAC replaced this legacy unit with the SAI50AX65S, a direct sharing the exact ISO 15552 mounting interface, force, and porting. The SAI upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure.
Airtac SI50 Standard Cylinder SI50AX65S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX65S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX65S |
| Bore size | Ø50 mm |
| Stroke | 65 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 SAI50AX65S 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 SAI50AX65S 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 SI50AX65S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×65 | 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 SI50AX65S Is Used
Stainless Rod Clamping
Ideal for mid-force clamping tasks where the SUS420J2 stainless piston rod resists moisture and coolant splashes during machining operations.
Package Diverting
Provides reliable 65mm actuation to push or divert packages on a line, utilizing the 982 N thrust at 0.5 MPa for consistent positioning.
Replacing the Airtac SI50 Standard Cylinder SI50AX65S with the SAI50AX65S
To replace the SI50AX65S, order the SAI50AX65S. Verify your ISO 15552 mounting fixtures, the G1/4 air port, and the M16x1.5 rod thread. The -S magnet enables current AirTAC switches, while the -A rod specifies SUS420J2 stainless steel. If you need more force, the 63mm bore yields 1559 N push at 0.5 MPa; if less is required, the 40mm bore provides 628 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX65S
- ✓ 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 SI50AX65S FAQ
Yes, the AirTAC SI50AX65S is discontinued. The direct replacement is the SAI50AX65S. It shares the identical ISO 15552 mounting interface, 50mm bore, 65mm stroke, G1/4 port, and output force, fitting directly into your existing fixtures.
The G1/4 port supplies a 20mm rod. Force output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and 1767 N push at 0.9 MPa. The theoretical maximum force is 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX65S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX65S replacement — usually within 7-8 hours.