This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX240S, 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 SI50AX240S
The AirTAC Airtac SI50 Standard Cylinder SI50AX240S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 240mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX240S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX240S
- 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 SI50AX240S
The AirTAC SI50AX240S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 240mm stroke, and a SUS420J2 stainless steel rod. It delivers 982 N push and 825 N pull at 0.5 MPa. The direct replacement is the SAI50AX240S, matching the bore, stroke, G1/4 port, and ISO 15552 mounting interface for seamless fixture integration.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and extended life. The original -S magnet supports CS1-B/DS1-B sensors, while the SAI family expands options with SAIL lock, SAIF valve, and BSAI clamp variants.
Airtac SI50 Standard Cylinder SI50AX240S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX240S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX240S |
| Bore size | Ø50 mm |
| Stroke | 240 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 SAI50AX240S 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 SAI50AX240S 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 SI50AX240S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×240 | 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 SI50AX240S Is Used
Diverting Mechanisms
Actuates routing gates on packaging lines, utilizing the 982 N push force to reliably pivot heavy product flow.
Stainless Rod Handling
The SUS420J2 rod excels in humid washdown environments, pushing carts or dampers without surface corrosion.
Replacing the Airtac SI50 Standard Cylinder SI50AX240S with the SAI50AX240S
To replace the SI50AX240S, order the SAI50AX240S and verify the ISO 15552 mounting interface, 50mm bore, 240mm stroke, G1/4 port (PT/G/NPT), and your specific mounting accessory. The -S magnet enables position sensing, using legacy CS1-B/DS1-B switches on the SI or current AirTAC switches on the SAI. The -A rod denotes the SUS420J2 stainless material, ideal for corrosive environments compared to the standard carbon steel rod. If sizing alternatives, neighbouring bores (40mm or 63mm) shift the 0.5 MPa push force to 628 N or 1559 N respectively. Note that a plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For load holding, specify an external pilot check valve, rod lock, or the SAIL/BSAI lock variant. At 240mm stroke, standard guide rails should be used to prevent rod bending and side-load wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX240S
- ✓ 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 SI50AX240S FAQ
Yes, the SI50AX240S is discontinued. The direct replacement is the SAI50AX240S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 240mm stroke, G1/4 port, and mounting interface. You simply order the SAI equivalent.
This double-acting cylinder features a G1/4 air port. The thrust ratings are: 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 maximum force of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX240S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX240S replacement — usually within 7-8 hours.