Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30 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 30mm for a usable window of 270–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable270–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30
The AirTAC MBLCJ40X300-30 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. A Ø16 hard-chrome plated carbon-steel rod drives 628 N of push force at 0.5 MPa. The rear stopper allows you to trim up to 30 mm of travel, creating a usable end-position window of 270-300 mm for exact fixture positioning. A G1/4 port feeds the 40 mm bore, while the riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal ensure long service life.
This SKU ships without a built-in magnet, meaning it cannot support CMSG, DMSG, or EMSG electronic position sensing. The adjustable air cushion uses screw-tunable deceleration to absorb kinetic energy near the stroke ends, protecting the end covers from impact damage. Because the 300 mm stroke is relatively long for a 16 mm rod, external guide rails are recommended to prevent side-load bending and premature seal wear.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 270–300 mm (trim 30 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 MBLCJ40X300-30
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | 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 MBLCJ40X300-30 Is Used
Textile Loom Beam Shift
Drives the heavy 300 mm lateral shift of a textile loom beam, using the 270-300 mm adjustable window to perfectly time the weft insertion without over-traveling the 628 N payload.
CNC Pallet Deceleration
Indexes a heavy machining pallet into the workzone, relying on the tunable air cushion to smoothly brake the 880 N @0.7 MPa kinetic load before it strikes the end cover.
Packaging Folder Arm
Actuates a 300 mm carton folder arm, where the rear stopper sets the exact 270 mm fold depth and the cushion prevents jarring stops that would misalign the cardboard.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-30 the Right Cylinder?
When sizing this 40 mm bore, consider stepping down to the 32 mm version if your load requires less force (it provides 402 N push at 0.5 MPa), or stepping up to the 50 mm bore for heavier payloads (delivering 981 N push at 0.5 MPa). Choose this MBLCJ variant over the MBLJ when you need active end-of-stroke deceleration rather than a fixed rubber bumper, or over the MBLC model when you need to fine-tune the travel end-point.
Remember that the rear adjuster is a travel stop, not a mechanical lock; it sets the end position but does not hold the load in place without live air pressure. Mounting options are limited to Basic, FA (flange), or LB (foot) brackets; there is no SDB pivot or back-cover option. To match this exact replacement, specify: 40 mm bore, 300 mm stroke, 30 mm adjust code, G1/4 port with PT threads, and no magnet (no -S).
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 MBLCJ40X300-30 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 is 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa. It operates at speeds between 30 and 800 mm/s.
The rear 30 mm adjustable stroke is a mechanical travel stopper that sets your usable end-position window between 270 and 300 mm; it does not lock or hold the load without air pressure. The adjustable air cushion is a separate screw-tunable valve that uses trapped air to decelerate the piston near the stroke ends, preventing impact damage to the end covers.
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Standard models usually ship in 3-4 days.
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