Airtac JSI Series Standard Cylinder JSI50X400S
The AirTAC Airtac JSI Series Standard Cylinder JSI50X400S 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 JSI50X400S
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 cylinder of the same 50 mm bore. The extruded hard-anodized aluminum barrel omits external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life. Because the -S suffix denotes a built-in magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing. Plan for roughly 589 N of actual work at 0.5 MPa, which translates to lifting about 50 kg vertically with a 2:1 safety margin. The unit features a G1/4 port, an M18x1.5 rod thread, and adjustable air cushions at both ends.
With a 400 mm stroke, the 20 mm piston rod extends significantly, so external guide rails should be used to prevent side-load bending and preserve bearing life. The NBR piston seal and TPU buffer gasket operate reliably across a -20 to +70 C temperature range at pressures from 0.15 to 1.0 MPa.
Airtac JSI Series Standard Cylinder JSI50X400S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI50X400S |
|---|---|
| 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 JSI50X400S
| 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 JSI50X400S Is Used
Carton Pusher
Uses the 982 N push force at 0.5 MPa to divert heavy packaged goods from a main conveyor belt to a secondary packaging line.
Vertical Material Lift
Lifts approximately 50 kg of raw material from a lower hopper to an elevated processing chute using the 400 mm stroke.
Pallet Stopper Gate
Acts as a 50 kg capacity holding gate on a gravity roller conveyor, raising 400 mm to release loaded pallets downstream.
Is the Airtac JSI Series Standard Cylinder JSI50X400S the Right Cylinder?
When sizing this 50 mm bore, stepping down to a 40 mm bore drops the 0.5 MPa push force to 628 N, whereas stepping up to a 63 mm bore raises it to 1559 N. If your machine experiences air loss or a centered valve, be aware that the piston will drift, as the adjustable cushion only decelerates the stroke near the end caps rather than locking the load. For suspended or vertical loads that must hold position, integrate an external rod lock or a pilot-operated check valve. The included -S magnet pairs seamlessly with CMSE or DMSE sensors for end-of-stroke confirmation. Given the 400 mm extension, always mount external guides to absorb lateral forces and protect the rod from bending.
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 JSI50X400S FAQ
The 50 mm bore provides a push force of 982 N and a pull force of 825 N at 0.5 MPa. At 0.7 MPa, push is 1374 N and pull is 1154 N. The theoretical maximum force is 200 kgf at 1.0 MPa. It uses a G1/4 air port, an M18x1.5 rod thread, and operates at speeds between 30 and 800 mm/s.
It is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 50 mm bore. This space-saving design uses an extruded aluminum barrel without external rods. Additionally, the -S suffix means it has a built-in magnet for CMSE or DMSE sensors.
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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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