This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X400SH, 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 SI50X400SH
The AirTAC SI50 Standard Cylinder SI50X400SH is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X400SH, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X400SH
- 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 SI50X400SH
The AirTAC SI50X400SH is a discontinued double-acting ISO 15552 profile cylinder with a 50mm bore and 400mm stroke. It delivers 982N push and 825N pull at 0.5MPa through a G1/4 port. The direct replacement is the SAI50X400SH, matching the interface, force, and stroke exactly.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. It retains the -S magnet for CS1-B/DS1-B switches and the -H Viton seal for 0-150C heat.
Airtac SI50 Standard Cylinder SI50X400SH Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X400SH |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X400SH |
| Bore size | Ø50 mm |
| Stroke | 400 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 SAI50X400SH 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 SAI50X400SH 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 SI50X400SH
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 SI50X400SH Is Used
Hot End Ejection
Uses the Viton H high-temperature seal to push parts out of 150C molding zones safely.
Long Transfer Divert
Executes 400mm strokes to shift products between parallel conveyor lines smoothly.
Vertical Lift Gate
Lifts approximately 50kg access gates using the 982N thrust at 0.5MPa supply pressure.
Replacing the Airtac SI50 Standard Cylinder SI50X400SH with the SAI50X400SH
To replace the SI50X400SH, order the SAI50X400SH. Confirm the ISO 15552 mounting interface, G1/4 port, M16x1.5 rod thread, and mounting accessory. The SAI family adds SAIL, SAIF, and BSAI lock variants the SI lacked. A plain cylinder drifts on air loss; use a pilot check valve for holding. At 400mm stroke, prevent rod bending by using external guides to manage side loads. Neighbouring bores: 40mm gives 628N push, 63mm gives 1559N push at 0.5MPa.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X400SH
- ✓ 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 SI50X400SH FAQ
Yes, the SI50X400SH is discontinued. The direct replacement is the SAI50X400SH. It is dimensionally interchangeable per ISO 15552, keeping the same 50mm bore, 400mm stroke, 982N force, G1/4 port, and mounting interface.
The G1/4 port bore delivers 982N push and 825N pull at 0.5MPa, 1374N push at 0.7MPa, 1767N push at 0.9MPa, and a theoretical max of 200kgf at 1.0MPa. The SAI upgrade uses a two Y-shaped one-way piston seal for low start-up pressure.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X400SH
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X400SH replacement — usually within 7-8 hours.