Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S 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 50mm for a usable window of 250–300mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke300 mm
- Adjustable250–300 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S
The AirTAC MBLCJ40X300-50S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, utilizing a Ø16 carbon-steel rod with 20 um hard-chrome plating. The built-in magnet (-S) supports CMSG reed and DMSG or EMSG electronic sensors for precise position detection.
This SKU provides a usable stroke window of 250 to 300 mm by allowing you to trim up to 50 mm of travel at the rear stopper. The adjustable air cushion lets you screw-tune end-of-stroke deceleration to protect the end covers during heavy moves, unlike the fixed rubber bumper found on the MBLJ series. Keep in mind the riveted rolling-packed barrel extends to an overall length of A plus 2 times stroke plus adjust, and the rear stopper sets the travel end but does not lock the load in place.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 250–300 mm (trim 50 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 MBLCJ40X300-50S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | Nominal stroke length in mm. |
| -50 | 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 MBLCJ40X300-50S Is Used
Injection Mold Ejection
Provides 628 N of push at 0.5 MPa to eject heavy plastic parts, using the 250-300 mm stroke window to time the exact ejection travel point.
Wood Routing Clamp
Tunes the end-of-stroke air cushion to softly decelerate an 880 N clamping force at 0.7 MPa, preventing impact damage to wooden routing fixtures.
Textile Beam Loom
Shifts heavy textile beams during pattern changes, relying on the DMSG electronic sensor to confirm rod extension before the loom accelerates.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X300-50S the Right Cylinder?
If you need less force, the 32 mm bore provides 402 N of push at 0.5 MPa, while stepping up to the 50 mm bore yields 981 N for heavier duty. The MBLCJ stands out from the fixed-stroke MBLC by offering a rear travel stopper, and it upgrades the base MBLJ bumper with tunable air cushions. Neither the cushion nor the adjuster acts as a brake; the rod will drift without live air, so use an external locking device for position holding.
Mounting is limited to Basic, FA flange, or LB foot styles, as there is no SDB pivot or back-cover option on this body. When replacing this cylinder, verify the 40 mm bore, 300 mm stroke, 50 mm adjust code, G1/4 port, PT thread form, and the -S magnet. Because this unit uses a 300 mm stroke, the small 16 mm rod is highly susceptible to side-load bending; always guide the load externally to prevent cylinder damage.
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 MBLCJ40X300-50S 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 reaches 880 N, with a theoretical maximum of 128 kgf at 1.0 MPa. The 40 mm bore supports standard strokes up to 500 mm, so the 300 mm stroke is standard.
The adjustable stroke is a rear travel stopper that lets you trim up to 50 mm of movement, creating a 250 to 300 mm usable window. The adjustable air cushion is a separate screw-tunable valve that controls end-of-stroke deceleration. Neither mechanism locks the load; the rod drifts without live air pressure.
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