Airtac JSI Series Standard Cylinder JSI40X85
The AirTAC Airtac JSI Series Standard Cylinder JSI40X85 is a genuine double acting JIS-standard air cylinder with a Ø40mm bore and 85mm 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
- Stroke85 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 JSI40X85
Generating 628 N of push force at 0.5 MPa, this double-acting 40 mm bore cylinder handles an 85 mm stroke in a JIS-standard profile body. Because it uses an extruded hard-anodized aluminum barrel without external rods, the overall envelope is shorter and more compact than an ISO 15552 cylinder of the same bore, saving valuable space on tight machinery. The two-way piston seal retains grease for long, low-friction life.
This specific SKU lacks the -S magnet, so it cannot accept CMSE or DMSE position switches. For real-world sizing, plan for about 377 N of actual work at 0.5 MPa (roughly 60 percent of the rated push), which translates to lifting about 32 kg vertically with a 2:1 safety margin. It connects via a G1/4 port and features a 20.5 mm adjustable air cushion at both ends to decelerate the piston smoothly.
Airtac JSI Series Standard Cylinder JSI40X85 Technical Specifications
| Model | Airtac JSI Series Standard Cylinder JSI40X85 |
|---|---|
| Series | JSI JIS-standard profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 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 JSI40X85
| JSI | JIS-standard profile cylinder (double-acting type). |
|---|---|
| 40 | Bore size in mm (32 / 40 / 50 / 63 / 80 / 100 / 125). |
| ×85 | 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 JSI40X85 Is Used
Small Parts Ejection
Pushes lightweight plastic mouldings out of an injection press with 628 N at 0.5 MPa, safely within the 377 N safe working load for continuous cycling.
Package Diverting
Actuates a routing gate on a packaging line, using the 85 mm stroke to redirect small cartons without taking up the frame space an ISO 15552 cylinder would require.
Clamp Actuation
Secures aluminium extrusions in a machining fixture, lifting parts weighing up to 32 kg vertically with a 2:1 safety margin before milling operations begin.
Is the Airtac JSI Series Standard Cylinder JSI40X85 the Right Cylinder?
If 628 N of push at 0.5 MPa is too much, the smaller JSI32 bore offers 402 N; stepping up to the JSI50 provides 982 N. Note that an 85 mm stroke is a non-standard made-to-order length for this series, so expect a longer lead time. The M14x1.5 rod thread pairs with I, Y, F, or U knuckles, and mounting options include LB foot, FA/FB flange, CA/CB/CR clevis, and TC/TCM1/TCM2 trunnion styles.
Because this is a double-acting cylinder, air drives the piston in both directions. If the air supply drops or the valve is centered, the piston will drift and cannot hold a load; the end cushions only decelerate motion near stroke end and act as neither a brake nor a lock. To suspend a load safely, 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 JSI40X85 FAQ
At 0.5 MPa it provides 628 N push and 528 N pull; at 0.7 MPa it provides 879 N push and 739 N pull. The theoretical maximum force is 128 kgf at 1.0 MPa. The air port is G1/4, the rod thread is M14x1.5, and the adjustable air cushion stroke is 20.5 mm at each end.
No, this specific SKU does not include the -S magnet, so CMSE or DMSE magnetic switches cannot be used. You would need the JSI40X85-S variant to enable sensing. Additionally, this JIS-standard profile cylinder is shorter and more compact than an ISO 15552 cylinder of the same 40 mm bore.
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