Airtac JSI Series Standard Cylinder JSI50X400SFA
The AirTAC Airtac JSI Series Standard Cylinder JSI50X400SFA is a genuine double acting JIS-standard air cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. Its no-tie-rod, hard-anodized profile barrel is more compact than an ISO 15552 cylinder of the same bore — a space-saver on tight machines.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM18×1.5
- CushionAdjustable, 20.5 mm
- 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 JSI Series Standard Cylinder JSI50X400SFA
Delivering 982 N of push force at 0.5 MPa, this double-acting JIS-standard profile cylinder saves valuable machine space by being noticeably shorter than an ISO 15552 unit of the same 50 mm bore. The extruded hard-anodized aluminum barrel eliminates external rods to resist wear, while the heterogeneous two-way piston seal retains grease for a long, low-friction service life. Air connects via a G1/4 port, and the M18x1.5 rod thread mates securely with standard knuckles.
Because the code includes an S, a built-in piston magnet lets you drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing. In real-world use, plan for about 589 N of actual work at 0.5 MPa, which translates to lifting roughly 50 kg vertically with a 2:1 safety margin. The FA flange accessory provides a robust front-mounting interface for your fixture.
Airtac JSI Series Standard Cylinder JSI50X400SFA Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X400SFA |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M18×1.5 |
| 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, 20.5 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC JSI (JIS standard) datasheet. Confirm against the product label before installation. Thread options: PT (blank) / G. Barrel: hard-anodized aluminum profile (no tie rods).
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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac JSI Series Standard Cylinder JSI50X400SFA
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 50 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×400 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSE / DMSE sensors. |
JSI-family variants: JSI (double acting), JSID (double rod), JSIJ (adjustable stroke). Mounting: LB / FA / FB / CA / CB / CR / TC / TCM1 / TCM2. Thread PT (blank) / G.
Where the Airtac JSI Series Standard Cylinder JSI50X400SFA Is Used
Packaging Line Diverter
Uses the 982 N push force at 0.5 MPa to push cartons between lanes on a high-speed packaging conveyor, relying on the 400 mm stroke to clear the belt entirely.
Palletizing Push-Off
Mounts via the FA flange to eject stacked goods from a palletizer platform, moving approximately 50 kg loads vertically with a safe 2:1 margin.
Component Ejection Press
Fits into a tight machine cell where its JIS profile saves length compared to an ISO 15552 cylinder, safely knocking molded parts out of a press tool.
Is the Airtac JSI Series Standard Cylinder JSI50X400SFA the Right Cylinder?
When sizing this 50 mm bore, dropping down to a 40 mm bore reduces the push force to 628 N at 0.5 MPa, while stepping up to a 63 mm bore increases it to 1559 N. The included FA flange secures the front face, but you can also swap to LB foot, TC trunnion, or CA clevis mounts. Because this model features the S magnet, it is fully ready for CMSE and DMSE sensors.
At a 400 mm stroke, the extended M18x1.5 rod is susceptible to bending under lateral stress. Always guide the load externally to prevent side loads and ensure the piston travels true. Remember that a standard cylinder drifts if air pressure drops or the valve is centered; the adjustable 20.5 mm cushions only decelerate the piston near the end caps. Install a pilot-operated check valve or external rod lock if the load must be held securely in place.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Set cushions to minimum, then release gradually.
- check Use correct mounting accessory (LB/FA/FB/CA/CB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac JSI Series Standard Cylinder JSI50X400SFA FAQ
This 50 mm bore cylinder features a G1/4 air port and an M18x1.5 rod thread. The thrust output is 982 N push and 825 N pull at 0.5 MPa, 1374 N push and 1154 N pull at 0.7 MPa, with a theoretical maximum of 200 kgf at 1.0 MPa.
It is a JIS-standard profile cylinder that is physically shorter and more compact than an ISO 15552 cylinder of the same bore. It does not hold position if air is lost, as the cushions only decelerate the piston; use an external rod lock for holding. The built-in magnet allows CMSE and DMSE sensors to track position.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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