This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X1400S, 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 SI50X1400S
The AirTAC SI50 Standard Cylinder SI50X1400S 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 SAI50X1400S, 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 → SAI50X1400S
- 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 SI50X1400S
The AirTAC SI50X1400S is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 1400mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X1400S, matching the exact interface, force, and mounting. Note that 1400mm exceeds the 1200mm standard maximum, making this a non-standard made-to-order stroke.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. It also introduces SAIL, SAIF, and BSAI lock variants absent in the SI line. The -S suffix means a piston magnet for CS1-B/DS1-B sensors; the SAI uses current AirTAC switches.
Airtac SI50 Standard Cylinder SI50X1400S Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X1400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X1400S |
| 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 SAI50X1400S 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 SAI50X1400S 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 SI50X1400S
| 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 SI50X1400S Is Used
Long-Reach Diversion
Actuates diverter arms across wide conveyor belts, utilizing the full 1400mm travel to route large packages smoothly.
High-Bay Pusher
Pushes pallets or totes deep into storage racking, where the 982N push force at 0.5MPa handles substantial inertial loads.
Material Lowering
Lowers heavy fixtures over a long descent, requiring external guides to manage side loads on the extended 20mm rod.
Replacing the Airtac SI50 Standard Cylinder SI50X1400S with the SAI50X1400S
To replace the SI50X1400S, order the SAI50X1400S direct, confirming the ISO 15552 mounting interface, 50mm bore, 1400mm stroke, G1/4 port, and magnet. Since 1400mm exceeds the 1200mm standard stroke, expect a made-to-order item. At 0.5MPa, push is 982N; if sizing down, a 40mm bore yields 628N, while a 63mm bore yields 1559N. For a 1400mm stroke, use external guides to prevent rod bending and side-load damage. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variant. Rod material options include carbon steel, SUS420J2 (A), or SUS304 (B); seals include Viton H for high temp.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X1400S
- ✓ 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 SI50X1400S FAQ
Yes, the SI50X1400S is discontinued. The direct replacement is the SAI50X1400S. It is dimensionally interchangeable per ISO 15552, retaining the same 50mm bore, 1400mm stroke, force, G1/4 port, and mounting fixtures.
This double-acting cylinder uses a G1/4 air port. At 0.5MPa it provides 982N push and 825N pull. At 0.7MPa push is 1374N, and at 0.9MPa it is 1767N. The theoretical maximum force is 200kgf at 1.0MPa.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X1400S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X1400S replacement — usually within 7-8 hours.