Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75 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 75mm for a usable window of 225–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable225–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75
The AirTAC MBLCJ40X300-75 is a compact double-acting aluminum mini cylinder featuring a rear travel stopper and tunable end-of-stroke deceleration. It delivers 628N of push force at 0.5 MPa via a Ø16 carbon-steel rod with 20µm hard-chrome plating. The rear adjuster allows you to trim up to 75mm of travel, creating a usable stroke window of 225-300mm to perfectly dial in end positions for long-trroke machinery.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses a screw-tunable air cushion at both ends to absorb kinetic energy smoothly. The riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal lock in lubrication for high cycle counts. Note that this specific SKU lacks a built-in magnet (-S), meaning it cannot accept a CMSG, DMSG, or EMSG position sensor switch without a model change.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 225–300 mm (trim 75 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 MBLCJ40X300-75
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | 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 MBLCJ40X300-75 Is Used
CNC Pallet Changer
Drives a 300mm pallet swap stroke in machining centers, using the 75mm rear adjustment to dial in the exact docking distance and the air cushion to halt a heavy 628N tooling plate without slam.
Cardboard Strapper
Cycles a sealing head down 225-300mm over corrugated packaging lines, relying on the tunable cushion to decelerate the 16mm rod smoothly before it strikes the strapping head.
Textile Calender Nip
Adjusts the nip roller gap on fabric finishing machines, trimming the stroke window down from 300mm to perfectly match varying fabric thicknesses while absorbing rotational momentum.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-75 the Right Cylinder?
If you need less force, stepping down to the 32mm bore yields 402N push at 0.5 MPa, while stepping up to the 50mm bore provides 981N for heavier loads. Choose this MBLCJ over the MBLJ when your moving mass requires regulated deceleration to protect the end covers from impact. The rear stroke adjuster sets the physical travel end, and the cushion only decelerates; neither component acts as a mechanical lock to hold a load in place, so external locking devices are required for static positioning.
Mounting is limited to Basic, FA (flange), or LB (foot) brackets; SDB pivot and back-cover options are not available for this series. The overall length is A + 2 x stroke + adjust, meaning this 300mm stroke variant is physically long. At this length, the 16mm rod is susceptible to bending under lateral stress, so an external guide rail must be used to support the load. To replace this cylinder, match the 40mm bore, 300mm stroke, 75mm adjust code, G1/4 port, PT thread, and no-magnet configuration.
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 MBLCJ40X300-75 FAQ
At 0.5 MPa, it pushes with 628N and pulls with 528N. Increasing to 0.7 MPa yields 880N of push force. The maximum theoretical force is 128 kgf at 1.0 MPa, operating within a 0.15-1.0 MPa pressure range.
The rear stroke adjuster is a mechanical travel stop that lets you trim the usable stroke from 225mm to 300mm. The adjustable air cushion is a separate screw-tunable valve that regulates end-of-stroke deceleration speed. Neither feature locks or holds the load in place.
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Standard models usually ship in 3-4 days.
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