Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20
The AirTAC MICJ Adjustable Mini Cylinder MICJ40X30-20 is a genuine double acting, double rod, adjustable stroke + cushion round-body mini air cylinder with a Ø40mm bore and 30mm stroke, 1/4" air ports and a stainless-steel barrel and rod for mildly corrosive environments.
- BoreØ40 mm
- Stroke30 mm
- Port size1/4"
- Acting typeDouble acting, double rod, adjustable stroke + cushion
- Rod threadM12×1.25
- CushionVariable air cushion, both ends
- 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 MICJ Adjustable Mini Cylinder MICJ40X30-20
Dial in the exact forward stop on-site with the AirTAC MICJ40X30-20, a round-body stainless-steel mini cylinder featuring a 20 mm adjustable extend stroke. An external screw trims the extend end position down from the 30 mm nominal stroke, letting you set the precise forward stop without swapping cylinders. A needle-set variable air cushion at both ends soaks up high-speed shock, giving you control over both the final position and the impact deceleration.
The stainless barrel and rod resist mild corrosion and washdown environments. It uses a 1/4" air port and a M12x1.25 male rod thread. This non-magnetic SKU cannot take a sensor; adding the -S magnet variant enables CMSG, DMSG, or EMSG switches. Note that Ø40 is a non-ISO-6432 size.
Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20 Technical Specifications
| Model | Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20 |
|---|---|
| Series | MICJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 mm |
| Acting type | Double acting, double rod, adjustable stroke + cushion |
| Port size | 1/4" |
| Rod thread | M12×1.25 |
| 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 | Variable air cushion, both ends |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MI/MIC (ISO 6432) datasheet. Barrel & rod: stainless steel (round-body, riveted construction). Thread options: PT (blank) / G. Note: the Ø40 bore is a larger, non-ISO-6432 size.
Theoretical Output Force (Ø40mm)
| Pressure | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
MIJ / MICJ are double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20
| MICJ | round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MI-family variants: MI / MIC (double acting ±cushion), MSI / MTI (single acting push / pull), MID / MICD (double rod ±cushion), MIJ / MICJ (double rod, adjustable stroke ±cushion). Back covers CA / U / R / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20 Is Used
Press Fit Tuning
Delivers 628.3 N to seat small components, using the 20 mm extend stop to dial in the exact crush depth without retooling.
High-Speed Diverter
Uses the dual adjustable air cushions to decelerate the 30 mm stroke smoothly at high speed, preventing endcap shock on heavy cartons.
Is the Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20 the Right Cylinder?
The adjustable stop screw and dual air cushions are ideal for fast, repeatable set-position moves where you must tune out impact shock. The stop screw sets the end position but is not a mid-stroke lock; the piston drifts on air loss, so use an external rod lock or pilot check valve for held loads. Mount via LB foot, FA flange, or TC trunnion (SDB pivot-block is unavailable), and select the -S version if you need position sensing.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC)
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 Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/R/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MICJ Adjustable Mini Cylinder MICJ40X30-20 FAQ
At 0.7 MPa, push is 879.6 N and pull is 738.9 N. The theoretical max force is 128.1 kgf at 1.0 MPa. It uses a 1/4" air port.
An external screw shortens the extend stroke by up to 20 mm, while a needle valve adjusts the air cushion at both ends to absorb high-speed shock. The cushion only decelerates near the end of stroke and does not lock the piston. This SKU lacks a magnet for sensors, and the cylinder will drift on air loss, so use an external rod lock to hold a load.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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