Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 75mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 55–75mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke75 mm
- Adjustable55–75 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S
The AirTAC MBLCJ20X75-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. It delivers 157 N of push force and 132 N of pull force at 0.5 MPa. The rear stopper allows you to trim up to 20 mm of travel, creating a usable 55-75 mm stroke window for precise end-position tuning. A built-in magnet (-S) enables compatibility with CMSG reed and DMSG or EMSG electronic sensors for rod position detection.
Unlike the standard MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, protecting the end covers during faster cycling. The riveted rolling-packed aluminum barrel and 20 µm hard-chrome plated carbon-steel rod withstand demanding environments, while the heterogeneous two-way grease-retaining piston seal maintains lubrication. Remember that the rear adjuster is a travel stop, not a mechanical lock; it sets the end position but does not hold the load against external forces.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 75 mm |
| Adjustable window | 55–75 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| 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 | Adjustable air cushion (both ends) |
| Max standard stroke | Up to 300 mm |
The rear stopper sets the end position — it is a travel stop, not a lock. Overall length = A + 2 × stroke + adjustable stroke. MBLJ/MBLCJ mounting is Basic / FA / LB only (no SDB, no back-cover code). Thread options: PT / G / NPT.
Theoretical Output Force (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a margin.
Model Code: Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×75 | Nominal stroke length in mm. |
| -20 | Adjustable-stroke amount (mm you can trim at the rear). |
| S | Optional built-in magnet for a CMSG/DMSG/EMSG sensor switch. |
Related: MBLJ (adjustable stroke, fixed bumper), MBL (fixed stroke), MBLD (double rod).
Where the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S Is Used
PCB Router Z-Axis Stop
Uses the 55-75 mm stroke window to fine-tune the plunge depth of a light spindle, while the dual air cushions prevent end-cover shock during rapid 157 N retraction.
Small Parts Ejector
Tunes the ejection stroke on a vibratory bowl feeder outlet using the 20 mm rear adjuster, relying on the cushion to silently decelerate the 8 mm rod before impact.
Label Applicator Tamp
Leverages the DMSG solid-state sensor to confirm the 75 mm extend position, applying labels with 132 N pull force without overshooting due to the adjustable cushion.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S the Right Cylinder?
If your application requires less force, stepping down is not an option as the 20 mm bore is the smallest available in this series, so you must step up to the 25 mm bore for 245 N of push force at 0.5 MPa. Conversely, if you need more power, the 32 mm bore provides 402 N. Choose this MBLCJ over the MBLJ when your moving mass requires tunable deceleration rather than a fixed bumper, or over the MBLC when you need that 20 mm of rear travel adjustment.
When ordering a replacement, verify the 20 mm bore, 75 mm stroke, 20 mm adjust code, G1/8 port with PT threads, and the -S magnet. Mounting is limited to Basic, FA flange, or LB foot options; this series uses no SDB pivot or back-cover code. Because the stroke is 75 mm, the 8 mm rod is susceptible to bending under side loads—always guide the load externally. Neither the air cushion nor the stroke adjuster acts as a brake or position lock.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Adjustable window fits your end position
- ✓ Adjuster is a travel stop, not a lock
- ✓ Magnet (S) for sensors?
- ✓ Side load — add a guide on long strokes
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear stopper for the end position (a travel stop, not a lock).
- check Avoid side load; add an external guide on long strokes.
- check Mounting: Basic / FA flange / LB foot (no SDB, no back-cover code).
- check Installation by qualified personnel per AirTAC docs.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X75-20S FAQ
At 0.5 MPa, this 20 mm bore cylinder provides 157 N of push force and 132 N of pull force. At 0.7 MPa, the push force increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa, with a proof pressure of 1.5 MPa.
The rear stroke adjuster mechanically trims the travel end-point, giving you a usable 55-75 mm window. The adjustable air cushion only regulates the deceleration speed near the stroke ends. Neither holds the load in place; the adjuster is a stop, not a lock.
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