Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S 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 20mm for a usable window of 280–300mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke300 mm
- Adjustable280–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S
The AirTAC MBLCJ20X300-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 157 N of push force at 0.5 MPa. The rear stopper allows you to trim up to 20 mm of travel, creating a precise 280-300 mm usable stroke window for exact end positioning.
Unlike the standard MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable air deceleration to protect the end covers during fast, long 300 mm movements. The riveted rolling-packed barrel and 20 um hard-chrome plated carbon-steel rod ensure durability. Equipped with a built-in magnet (-S), it supports CMSG reed and DMSG/EMSG electronic sensors for position feedback.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 280–300 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 MBLCJ20X300-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×300 | 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 MBLCJ20X300-20S Is Used
PCB Edge Router Trimming
Uses the 280-300 mm adjustable stroke window to precisely strike the end stop of a routing carriage, while the air cushion decelerates the 157 N push force smoothly.
Textile Loom Weft Insertion
Handles rapid 300 mm extensions across the loom, relying on the tunable cushion to prevent impact damage to the end covers during high-speed cycling.
Label Dispenser Feed
Leverages the built-in magnet with a DMSG electronic sensor to confirm full 300 mm extension, feeding web materials accurately in tight packaging spaces.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X300-20S the Right Cylinder?
For lower force needs, stepping down to a bore 16 mm cylinder reduces output, while stepping up to a bore 25 mm unit increases push force to 245 N at 0.5 MPa. Choose the MBLCJ over the MBLJ when your moving mass requires tunable end-of-stroke deceleration instead of a fixed bumper, or over the MBLC when you need that rear travel stopper. The 20 mm adjustment code sets the 280-300 mm window, while the adjustable cushion only controls deceleration speed—neither feature acts as a mechanical lock to hold a load.
This SKU uses a G1/8 port, PT thread form, M8x1.25 rod-end thread, and Basic mounting (no FA/LB foot or flange specified). Because the stroke is 300 mm on an Ø8 mm rod, external side-load guidance is highly recommended to prevent rod bending. Overall length equals A + 2 x 300 + 20.
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 MBLCJ20X300-20S 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 20 mm rear adjuster is a mechanical travel stop that sets your usable extension window between 280 and 300 mm. The adjustable air cushion only controls end-of-stroke deceleration to soften impact. Neither the stopper nor the cushion acts as a lock to hold a load in place.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Most inquiries answered within 7-8 hours.
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