Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 300mm nominal stroke and a rear adjustable-stroke stopper — trim up to 75mm for a usable window of 225–300mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke300 mm
- Adjustable225–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S
The AirTAC MBLCJ20X300-75S is a compact double-acting mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 157 N push force at 0.5 MPa through a 20 mm bore. The 75 mm rear trimmer allows you to tune the usable stroke window from 225 mm to 300 mm, providing exact end-position calibration. A built-in magnet enables position detection via CMSG reed or DMSG/EMSG electronic switches.
Unlike the fixed rubber bumper on the base MBLJ, the screw-tunable air cushion on this model decelerates heavier loads at high speeds to protect the end covers. The riveted aluminum barrel and 20 um hard-chrome plated Ø8 mm carbon-steel rod provide durability. Because the stroke is 300 mm on an 8 mm rod, you must use an external guide to prevent rod bending and seal wear under side loads.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 225–300 mm (trim 75 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 MBLCJ20X300-75S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -75 | 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 MBLCJ20X300-75S Is Used
Textile Loom Guide
Calibrating the 225-300 mm stroke window on a thread guide carriage, using the tunable cushion to soften the end-of-stroke impact during high-speed loom operation.
PCB Conveyor Diverter
Pushing populated PCB panels at 157 N across a 300 mm gap, using the built-in magnet to confirm full extension before the routing gate opens.
Small Parts Ejector
Ejecting molded plastic parts from a 20 mm bore cavity, dialing in the air cushion to prevent the 8 mm rod from slamming the rear cover at 800 mm/s.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-75S the Right Cylinder?
With a 157 N push force at 0.5 MPa, this 20 mm bore is the smallest in the range. If your application needs more power, step up to the 25 mm bore which provides 245 N push force. If you require less force or a shorter body, there is no smaller standard MBLCJ size. The MBLCJ differs from the MBLJ by using a tunable air cushion instead of a fixed bumper, and from the MBLC by adding the rear stroke adjuster.
When replacing this unit, match the 20 mm bore, 300 mm stroke, 75 mm adjust code, G1/8 port, PT thread, and the -S magnet. Note that the rear adjuster is a travel stop, not a lock; it sets the end position but does not hold the load. Mounting is limited to Basic, FA, or LB; there is no SDB pivot or back-cover option. The overall length equals A plus twice the stroke plus the 75 mm adjuster.
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 MBLCJ20X300-75S FAQ
At 0.5 MPa, the push force is 157 N and the pull force is 132 N. At 0.7 MPa, the push force is 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa.
The rear 75 mm adjuster is a mechanical travel stop that sets your usable stroke window between 225 mm and 300 mm. The adjustable air cushion only tunes end-of-stroke deceleration. Neither holds the load; you need an external lock for position holding.
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