This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX30S, 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 SI50AX30S
The AirTAC Airtac SI50 Standard Cylinder SI50AX30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 30mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX30S
- 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 SI50AX30S
The AirTAC SI50AX30S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 30mm stroke. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50AX30S, matching the bore, stroke, force, port and ISO 15552 mounting interface.
The SAI upgrade features two Y-shaped one-way piston seals for low start-up pressure and long life. This SI50AX30S variant uses a SUS420J2 stainless rod (-A) and a piston magnet (-S) for CS1-B/DS1-B switches.
Airtac SI50 Standard Cylinder SI50AX30S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX30S |
| Bore size | Ø50 mm |
| Stroke | 30 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 SAI50AX30S 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 SAI50AX30S 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 SI50AX30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×30 | 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 SI50AX30S Is Used
Short-Stroke Clamping
Ideal for compact 30mm clamping tasks in machining fixtures, utilizing the 982N push force at 0.5MPa to secure components firmly.
Package Diverting
Provides rapid 30mm actuation for diverting small to medium packages on conveyor lines, operating efficiently at 30-800mm/s.
Ejector Mechanisms
Suited for short-stroke part ejection in automated assembly, where the SUS420J2 stainless rod offers corrosion resistance.
Replacing the Airtac SI50 Standard Cylinder SI50AX30S with the SAI50AX30S
To replace the SI50AX30S, order the SAI50AX30S. Confirm the ISO 15552 mounting interface, 50mm bore, 30mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Keep the -S magnet for current AirTAC switches and the -A SUS420J2 stainless rod. If you need more force, the 63mm bore yields 1559N at 0.5MPa; if less is needed, the 40mm bore yields 628N. A plain cylinder drifts without air and the cushion only decelerates; for load holding use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX30S
- ✓ 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 SI50AX30S FAQ
Yes, the SI50AX30S is discontinued. The direct replacement is the SAI50AX30S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 30mm stroke, 982N force, G1/4 port and mounting interface.
The 50mm bore features a G1/4 air port and M16x1.5 rod thread. Forces are: 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX30S replacement — usually within 7-8 hours.