This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X300SH, 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 SI50X300SH
The AirTAC SI50 Standard Cylinder SI50X300SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 300mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X300SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X300SH
- 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 SI50X300SH
The AirTAC SI50X300SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 300mm stroke. Delivering 982N push force at 0.5MPa via a G1/4 port, it is replaced by the SAI50X300SH. This direct SAI upgrade shares identical mounting, bore, stroke, force, and port dimensions, fitting existing fixtures perfectly.
The SAI features an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. This -SH variant includes a Viton H seal for 0-150C high-temp environments, plus a magnet for CS1-B/DS1-B sensors. The SAI family also adds SAIL, SAIF, and BSAI lock variants.
Airtac SI50 Standard Cylinder SI50X300SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X300SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X300SH |
| Bore size | Ø50 mm |
| Stroke | 300 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 SAI50X300SH 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 SAI50X300SH 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 SI50X300SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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 SI50X300SH Is Used
Hot Product Diversion
Actuates diverter gates on high-temperature conveyor lines, utilizing the Viton H seal to withstand ambient heat up to 150C while routing goods.
Extended Reach Ejection
Pushes molded parts out of press zones using the 300mm stroke, requiring external guides to maintain alignment and absorb side loads over the long travel.
Vertical Pallet Lifting
Raises light palletized loads up to 50kg, safely operating within the 589N working load margin derived from the 982N push force at 0.5MPa.
Replacing the Airtac SI50 Standard Cylinder SI50X300SH with the SAI50X300SH
To replace the SI50X300SH, order the SAI50X300SH. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and the -S magnet for legacy CS1-B/DS1-B switches (the SAI uses current AirTAC switches). The -H Viton seal provides 0-150C heat resistance. For sizing, the 50mm bore yields 982N push at 0.5MPa; stepping down to 40mm drops force to 628N, while 63mm increases it to 1559N. At 300mm stroke, use external guides to prevent rod bending and side-load wear. A plain cylinder drifts on air loss—the cushion only decelerates—so for load holding use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X300SH
- ✓ 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 SI50X300SH FAQ
Yes, the SI50X300SH is discontinued. The direct replacement is the SAI50X300SH. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 300mm stroke, 982N force, G1/4 port, and mounting interface to fit existing fixtures.
This double-acting 50mm bore cylinder features a G1/4 air port. The thrust ratings are 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical maximum of 200kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X300SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X300SH replacement — usually within 7-8 hours.