This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1400STC, 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 SI50X1400STC
The AirTAC Airtac SI50 Standard Cylinder SI50X1400STC is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 1400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X1400STC, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke1400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X1400STC
- 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 SI50X1400STC
The AirTAC SI50X1400STC is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1400mm stroke. Because 1400mm exceeds the 1200mm standard maximum for this bore, it is a non-standard, made-to-order configuration. It delivers 982N push force at 0.5MPa via a G1/4 port. The direct replacement is the SAI50X1400STC, sharing the exact ISO 15552 mounting interface, TC trunnion mount, stroke, and force.
The SAI upgrade features a refined piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. The SAI family also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. This -S model includes a piston magnet for legacy CS1-B/DS1-B sensors, while the SAI uses current AirTAC switches. Rod material options include carbon steel, SUS420J2, or SUS304.
Airtac SI50 Standard Cylinder SI50X1400STC Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1400STC |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1400STC |
| Bore size | Ø50 mm |
| Stroke | 1400 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 SAI50X1400STC 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 SAI50X1400STC 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 SI50X1400STC
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×1400 | 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 SI50X1400STC Is Used
Long-Reach Diversion
Actuates diverter arms across wide conveyor belts where the 1400mm stroke is required to push packages cleanly out of the flow.
Pallet Push-Off
Provides the 982N push force at 0.5MPa needed to eject empty pallets from a handling zone using the TC trunnion mount.
Replacing the Airtac SI50 Standard Cylinder SI50X1400STC with the SAI50X1400STC
To replace the SI50X1400STC, order the SAI50X1400STC. Verify the ISO 15552 TC trunnion interface, 50mm bore, 1400mm non-standard stroke, G1/4 port, and the -S magnet. When sizing, neighboring bores offer different forces: the 40mm bore yields 628N push, while the 63mm bore yields 1559N push at 0.5MPa. Note that a 1400mm stroke requires external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; the air cushion only decelerates near stroke end. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1400STC
- ✓ 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 SI50X1400STC FAQ
Yes, the SI50X1400STC is discontinued. The direct replacement is the SAI50X1400STC. It is dimensionally interchangeable per ISO 15552, maintaining the same 50mm bore, 1400mm stroke, G1/4 port, TC mount, and output force.
This double-acting cylinder has 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. The 1400mm stroke is non-standard and made-to-order.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1400STC
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1400STC replacement — usually within 7-8 hours.