Airtac JSI Series Standard Cylinder JSI40X850STC
The AirTAC Airtac JSI Series Standard Cylinder JSI40X850STC 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 JSI40X850STC
Delivering 628 N of push force at 0.5 MPa, the AirTAC JSI40X850STC is a double-acting JIS-standard profile cylinder built for tight machinery layouts. Its extruded hard-anodized aluminum barrel contains no external rods, making the unit significantly shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore. The G1/4 port and M14x1.5 rod thread handle the air supply and linkage, while a two-way piston seal retains grease for low-friction service over a long life.
Because the model code includes an S, a built-in magnet enables CMSE or DMSE sensors to drop directly into the side grooves for position detection. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa, which safely lifts roughly 32 kg vertically with a 2:1 margin. The adjustable air cushions at both ends decelerate the piston near stroke end, and the TC trunnion mount supplies the pivot interface for this 850 mm stroke.
Airtac JSI Series Standard Cylinder JSI40X850STC Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X850STC |
|---|---|
| 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 JSI40X850STC
| 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 JSI40X850STC Is Used
Package Diverting
Pushes cartons across sorting lanes using the 528 N pull force, with the TC trunnion allowing the body to pivot smoothly during the transfer arc.
Vertical Material Lift
Raises lightweight tote bins weighing up to 32 kg, relying on the built-in magnet to trigger DMSE sensors at the upper travel limit.
Long-Reach Clamping
Extends 850 mm to secure distant workpieces on a large welding fixture, where the hard-anodized barrel resists shop-floor abrasion.
Is the Airtac JSI Series Standard Cylinder JSI40X850STC the Right Cylinder?
When sizing this 40 mm bore, dropping down to a 32 mm JSI yields 402 N of push at 0.5 MPa, whereas stepping up to a 50 mm bore provides 982 N. Because this 850 mm stroke is long, external guide rails are strongly recommended to prevent rod bending and premature seal wear under side loads. A plain cylinder drifts when air is lost or the valve is centered, as the cushions only decelerate the piston and never act as a lock; use an external rod lock or pilot-operated check valve to hold a suspended load.
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 JSI40X850STC FAQ
This 40 mm bore cylinder features a G1/4 air port and an M14x1.5 rod thread. It generates 628 N push and 528 N pull at 0.5 MPa, 879 N push and 739 N pull at 0.7 MPa, with a theoretical maximum of 128 kgf at 1.0 MPa.
The JSI series is a JIS-standard profile cylinder that is shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable space on machinery. It uses an extruded aluminum barrel without external rods and includes the -S magnet for side-groove CMSE or DMSE sensors.
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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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