Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 250mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 230–250mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke250 mm
- Adjustable230–250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S
The AirTAC MBLCJ40X250-20S 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 at 0.5 MPa through a single Ø16 mm hard-chrome plated rod. The 20 mm rear trimmer creates a usable end-position window of 230 to 250 mm, ideal for dialing in exact travel on packaging machines.
This unit includes a built-in magnet (-S) for solid-state DMSG or EMSG electronic sensors. Unlike the base MBLJ with its fixed rubber bumper, the screw-tunable cushion valves on this SKU decelerate heavier 250 mm moves to protect the end covers. The riveted rolling-packed barrel and grease-retaining seal prevent lubrication washout, while the rear stopper sets the travel limit without mechanically locking the load in place.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 230–250 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 MBLCJ40X250-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MBLCJ40X250-20S Is Used
Carton Flap Folding
Drives a folding arm on a packaging line where the 628 N push force cleanly tucks heavy cardboard flaps, while the 230-250 mm adjustable window adapts to varying box depths.
Belt Tensioner Actuator
Sets the precise position of an idler pulley on a conveyor drive; the adjustable air cushion prevents sudden jerks that could tear the belt during high-speed retraction.
Textile Beam Indexing
Shifts a heavy warp beam laterally across a weaving machine, relying on the tunable end-of-stroke deceleration to prevent thread snap-back when hitting the 250 mm mark.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push (528 N pull) at 0.5 MPa. To step down, the 32 mm bore yields 402 N push; to step up, the 50 mm bore provides 981 N push. Compared to the fixed-stroke MBLC, this SKU grants 20 mm of rear travel adjustment. The exact replacement match requires a 40 mm bore, 250 mm stroke, 20 mm adjust code, G1/4 port, PT thread, Basic/FA/LB mounting, and the -S magnet.
At 250 mm of travel, the slender 16 mm rod is susceptible to side-load bending; use an external guide rail for heavy off-center loads. Mounting is limited to Basic, FA flange, or LB foot—no SDB pivot or back-cover options exist. Remember the cushion only decelerates the stroke end and the adjuster acts as a hard stop; neither component will hold a load without live air pressure.
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 MBLCJ40X250-20S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull. At 0.7 MPa the push force is 880 N. The maximum theoretical force is 128 kgf at the 1.0 MPa operating pressure limit.
The 20 mm rear adjuster is a mechanical travel stop that sets your usable stroke window between 230 and 250 mm. The adjustable air cushion is a separate needle valve that regulates exhaust flow to decelerate the piston near the end covers. Neither feature locks or holds the load.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
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