This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X145S, 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 SI50X145S
The AirTAC Airtac SI50 Standard Cylinder SI50X145S 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 SAI50X145S, 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 → SAI50X145S
- 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 SI50X145S
The AirTAC SI50X145S is a discontinued double-acting ISO 15552 profile cylinder featuring a 50mm bore, 145mm stroke, and a G1/4 air port. It delivers 982 N push force at 0.5 MPa. AirTAC replaced this legacy unit with the SAI50X145S, a direct replacement retaining the exact ISO 15552 mounting interface, bore, stroke, output force, and port size.
The SAI upgrade introduces a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. This -S model includes a piston magnet for CS1-B/DS1-B legacy sensors, and the SAI family expands capabilities with SAIL, SAIF, and BSAI variants.
Airtac SI50 Standard Cylinder SI50X145S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X145S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X145S |
| 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 SAI50X145S 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 SAI50X145S 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 SI50X145S
| 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 SI50X145S Is Used
Package Diverting
Actuates routing gates on packaging lines where the 982 N push force at 0.5 MPa easily handles standard parcel weights.
Clamp Actuation
Secures medium-duty workpieces in machining fixtures, utilizing the 145mm stroke to clear the workspace during part loading.
Replacing the Airtac SI50 Standard Cylinder SI50X145S with the SAI50X145S
To replace the SI50X145S, order the SAI50X145S. Verify your existing fixture's ISO 15552 mounting interface (LB, FA, TC, etc.), the G1/4 port thread (PT, G, or NPT), and the M16x1.5 rod-end thread. Because this SKU includes the -S magnet, it supports CS1-B/DS1-B switches; the SAI replacement uses current AirTAC sensors. If you need to size both ways, a neighbouring 63mm bore offers 1559 N push at 0.5 MPa, while dropping to a 40mm bore yields 628 N. Note that a standard cylinder drifts on air loss since the cushion only decelerates; for load holding, consider an external pilot check valve or the SAIL/BSAI lock variants. With a 145mm stroke, side-load and rod-bending stresses are minimal, but always ensure proper guide alignment.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X145S
- ✓ 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 SI50X145S FAQ
Yes, the AirTAC SI50X145S is discontinued. The direct replacement is the SAI50X145S. It features the same ISO 15552 mounting interface, 50mm bore, 145mm stroke, output force, and G1/4 port, so it fits existing fixtures perfectly.
This 50mm bore double-acting cylinder has a G1/4 air port and M16x1.5 rod thread. The thrust is 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 of 200 kgf at 1.0 MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X145S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X145S replacement — usually within 7-8 hours.