Airtac JSI Series Standard Cylinder JSI40X850S
The AirTAC Airtac JSI Series Standard Cylinder JSI40X850S is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 850mm 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.
- BoreØ40 mm
- Stroke850 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM14×1.5
- 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 JSI40X850S
Generating 628 N of push force at 0.5 MPa, this double-acting 40 mm bore cylinder is built for an 850 mm stroke. As a JIS-standard profile unit, it is noticeably shorter and more compact than an equivalent ISO 15552 cylinder of the same bore, saving valuable space on tight machinery. The extruded hard-anodized aluminum barrel eliminates external rods to resist wear, while the two-way piston seal retains grease for a long, low-friction service life.
Because this SKU includes the -S magnet, you can drop CMSE or DMSE reed and electronic switches directly into the side grooves for position sensing. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which translates to lifting roughly 32 kg vertically with a 2:1 safety margin. The unit features a G1/4 port, an M14x1.5 rod thread, and operates at speeds between 30-800 mm/s.
Airtac JSI Series Standard Cylinder JSI40X850S Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X850S |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M14×1.5 |
| 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 JSI40X850S
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×850 | 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 JSI40X850S Is Used
Carton Pusher
Uses the 628 N push force at 0.5 MPa to divert lightweight packaging cartons on a high-speed sorting conveyor.
Vertical Elevator
Lifts approximately 32 kg of tote bins between conveyor tiers using the 850 mm stroke, guided by external rails to prevent rod bending.
Part Transfer
Moves plastic injection molded parts out of a press cell, relying on the -S magnet and DMSE sensors to confirm full extension.
Is the Airtac JSI Series Standard Cylinder JSI40X850S the Right Cylinder?
When sizing this 40 mm bore, dropping down to a 32 mm JSI reduces the push force to 402 N at 0.5 MPa, whereas stepping up to a 50 mm bore increases it to 982 N. This model carries an 850 mm stroke, which demands careful attention to side loads; always use external guides to prevent rod bending and premature seal wear over such a long extension. The integrated -S magnet pairs perfectly with CMSE or DMSE sensors for end-of-stroke confirmation. Remember that a standard air cylinder drifts when air is lost or a valve is centered, as the adjustable cushions only decelerate the piston near the end caps. To hold a load securely in an emergency, install an external rod lock or a pilot-operated check valve.
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 JSI40X850S FAQ
This 40 mm bore cylinder features a G1/4 port and delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa. At 0.7 MPa, the push force is 879 N and the pull force is 739 N. The theoretical maximum force is 128 kgf at 1.0 MPa.
The JSI is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. It uses a hard-anodized aluminum extruded barrel with no external rods, and the -S variant includes a magnet for side-groove 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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