This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50AX145S, 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 SI50AX145S
The AirTAC Airtac SI50 Standard Cylinder SI50AX145S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 145mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50AX145S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50AX145S
- 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 SI50AX145S
The AirTAC SI50AX145S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 145mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50AX145S, matching the interface, force, and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. This -S variant includes a magnet for legacy CS1-B/DS1-B sensors, and the -A rod is SUS420J2 stainless.
Airtac SI50 Standard Cylinder SI50AX145S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50AX145S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50AX145S |
| Bore size | Ø50 mm |
| Stroke | 145 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 SAI50AX145S 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 SAI50AX145S 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 SI50AX145S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×145 | 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 SI50AX145S Is Used
Mid-Force Clamping
Ideal for holding medium workpieces during machining, utilizing the 982N push force at 0.5MPa with the SUS420J2 stainless rod.
Package Diversion
Drives 145mm stroke diverters or gates on packaging lines, safely handling a 589N working load with reliable double-acting motion.
Replacing the Airtac SI50 Standard Cylinder SI50AX145S with the SAI50AX145S
To replace the SI50AX145S, order the SAI50AX145S. Verify the ISO 15552 mounting interface, 145mm stroke, G1/4 port, and the -S magnet for CS1-B/DS1-B sensors. The -A code specifies the SUS420J2 stainless rod. If you need more force, the 63mm bore yields 1559N push at 0.5MPa; if less is required, the 40mm bore yields 628N. For load holding on air loss, note that a plain cylinder drifts and the air cushion only decelerates—use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. For this 145mm stroke, ensure guide alignment to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50AX145S
- ✓ 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 SI50AX145S FAQ
Yes, the AirTAC SI50AX145S is discontinued. The direct replacement is the SAI50AX145S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 145mm stroke, G1/4 port, and mounting interface.
This 50mm bore cylinder features a G1/4 air port and M16x1.5 rod thread. The thrust is 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50AX145S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50AX145S replacement — usually within 7-8 hours.