Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20 is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm 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).
- BoreØ40 mm
- Stroke300 mm
- Adjustable280–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20
The AirTAC MBLCJ40X300-20 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa. The 20 mm rear adjustment yields a usable travel window of 280-300 mm, letting you dial in the exact end position for a 300 mm cycle. A G1/4 port and Ø16 carbon-steel rod with 20 µm hard-chrome plating handle the higher flow and thrust demands of this 40 mm bore.
Unlike the fixed rubber bumper on a standard MBLJ, the screw-tunable air cushion on this unit decelerates heavy loads near the stroke ends, protecting the end covers during fast 30-800 mm/s cycles. Note that this specific SKU lacks a built-in magnet, so it cannot accept CMSG, DMSG, or EMSG position sensors. The riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal ensure structural integrity and lubrication retention under high kinetic energy impacts.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 280–300 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/4 |
| 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 | Adjustable air cushion (both ends) |
| Max standard stroke | Up to 500 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 MBLCJ40X300-20
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | 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 MBLCJ40X300-20 Is Used
CNC Pallet Changer
Drives a 300 mm pallet shuttle stroke in machining centers, using the 628 N thrust to shift loaded work-holding fixtures while the air cushion absorbs the sudden end-of-travel impact.
Packaging Conveyor Diverter
Actuates a routing gate for heavy cardboard cartons, utilizing the 280-300 mm adjustable window to fine-tune the swing distance without repositioning cylinder mounts.
Automated Guided Cart Lifting
Raises a 40 mm bore payload platform in warehouse AGVs, relying on the tunable cushioning to prevent mechanical shock when stopping a heavy vertical load at the 300 mm mark.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-20 the Right Cylinder?
Choose this 40 mm bore when your application requires 628 N of push force at 0.5 MPa. If you need less force, step down to the 32 mm bore (402 N push), or step up to the 50 mm bore (981 N push) for heavier payloads. Compared to the MBLJ (fixed bumper) or MBLC (fixed stroke), the MBLCJ provides both tunable end-deceleration and a 280-300 mm travel window. Remember that the rear adjuster is a travel stop, not a load-holding lock; the air cushion only decelerates. You must use an external locking mechanism if the load must hold position without live air.
Mounting is limited to Basic, FA (flange), or LB (foot) styles; no SDB pivot or back-cover options exist for this cylinder. Because the overall length equals A + 2 x stroke + adjust, the 300 mm stroke creates a long physical envelope. The 16 mm rod is robust but at 300 mm of travel, side loads will cause bending; always guide the load externally to prevent rod damage. For a drop-in replacement, match the 40 mm bore, 300 mm stroke, 20 mm adjust code, G1/4 port, PT thread, and basic mounting without a magnet.
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 MBLCJ40X300-20 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa operating pressure.
This specific SKU does not have a built-in magnet (-S), so it cannot accept CMSG, DMSG, or EMSG sensors. The 20 mm rear adjuster creates a 280-300 mm usable travel window but acts only as a mechanical stop; it does not lock or hold the load in place. The adjustable air cushion solely manages end-of-stroke deceleration.
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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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