Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S 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 30mm for a usable window of 270–300mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke300 mm
- Adjustable270–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S
The AirTAC MBLCJ20X300-30S 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 at 0.5 MPa. The 30 mm rear trimmer creates a usable travel window of 270 to 300 mm, letting you dial in the exact end position without mechanical shims.
Unlike the fixed rubber bumper on the base MBLJ, the screw-tunable cushion valves here decelerate the piston near the stroke ends, absorbing kinetic energy from fast moves to protect the end covers. This SKU includes a built-in magnet for CMSG, DMSG, or EMSG sensor switches. Note that the 8 mm hard-chrome plated carbon-steel rod is slender; at a 300 mm extension, you must use an external guide to prevent side-load bending.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 270–300 mm (trim 30 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 MBLCJ20X300-30S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -30 | 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 MBLCJ20X300-30S Is Used
PCB Edge Router Trimming
Uses the 270-300 mm adjustable window to precisely strike the end-stop on a long-travel depaneling router, while the air cushion protects the cover from the 157 N impact at cycle end.
Textile Loom Tensioner
Extends the full 300 mm to position a yarn guide bar; the tunable cushion valves allow smooth deceleration of the rapid traverse, preventing sudden snaps that would break fine thread.
Dispensing Head Positioning
Leverages the -S magnet with a DMSG solid-state sensor to confirm the exact retracted position of an adhesive dispensing head before the next shot begins.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-30S the Right Cylinder?
Choose this 20 mm bore when you need 157 N push (132 N pull) at 0.5 MPa in a tight footprint. If your payload drops, step down to a smaller bore; if you need more force, step up to the 25 mm bore which provides 245 N push at 0.5 MPa. The 30 mm rear stopper sets the travel end but does not hold the load—the cylinder drifts without live air, so fit an external lock for position holding.
This configuration uses a G1/8 port, M8x1.25 rod thread, and default PT tapered threads. Mounting is limited to Basic, FA flange, or LB foot (no SDB pivot or back-cover option). The exact replacement match requires a 20 mm bore, 300 mm stroke, 30 mm adjust code, PT port, and the -S magnet. Because the stroke hits the 300 mm maximum limit for this bore size, external guidance is mandatory to prevent rod deflection.
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 MBLCJ20X300-30S FAQ
At 0.5 MPa it provides 157 N push and 132 N pull. At 0.7 MPa the push increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa operating pressure.
The 30 mm rear adjuster is a mechanical travel stop that sets your usable stroke window (270 to 300 mm), whereas the adjustable air cushion uses screw valves to tune end-of-stroke deceleration. Neither holds the load in place; the cylinder requires live air and an external lock for position holding.
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