Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20 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 MBLCJ40X250-20
The AirTAC MBLCJ40X250-20 is a double-acting, single-rod mini cylinder featuring a riveted aluminum barrel and a 20mm rear travel adjuster. This creates a usable end-position window of 230 to 250mm. A screw-tunable air cushion at both ends absorbs kinetic energy near the stroke limits, protecting the end covers from heavy impacts. At 0.5 MPa, it delivers 628N of push force and 528N of pull force, making it well-suited for moving substantial masses through a 250mm travel distance.
Unlike the base MBLJ which relies on a fixed rubber bumper, this MBLCJ variant allows you to dial in end-of-stroke deceleration for faster cycling. The rear stopper sets the travel end but does not mechanically hold the load; without live air pressure, the rod drifts. The 16mm carbon-steel rod features 20um hard-chrome plating to resist wear, while the heterogeneous two-way grease-retaining piston seal maintains lubrication over long service intervals. Note that this specific SKU lacks a built-in magnet, meaning it cannot support CMSG, DMSG, or EMSG position sensors.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20 |
|---|---|
| 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 MBLCJ40X250-20
| 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 MBLCJ40X250-20 Is Used
Injection Mold Ejection
Drives a 250mm ejection pin plate in a plastic injection molding machine, using the 628N push force to break parts free while the air cushion prevents hard slamming at the mold base.
Pallet Diverter Arm
Actuates a heavy routing gate on a packaging conveyor, using the 230-250mm adjustable window to fine-tune the gate's resting position without moving the cylinder's physical mounting blocks.
CNC Lathe Bar Feeder
Pushes raw steel bar stock into a lathe collet, relying on the tunable air cushion to decelerate the 16mm rod smoothly before it strikes the rear cover during rapid retraction.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-20 the Right Cylinder?
When sizing this 40mm bore, consider stepping down to the 32mm version if your load is lighter, as it provides 402N push at 0.5 MPa. If your application requires moving heavier fixtures, stepping up to the 50mm bore yields 981N push at 0.5 MPa. The MBLCJ is preferred over the MBLJ when your moving mass threatens to damage the end covers and requires active deceleration tuning. It differs from the MBLC by offering this rear travel adjuster for fine-tuning the end position.
Remember that neither the adjustable stroke stopper nor the air cushion acts as a mechanical lock; a separate external guide or locking device is required to hold a load stationary. Mounting is limited to Basic, FA (flange), or LB (foot) options, as this series does not support SDB pivot or back-cover configurations. To replace this unit, match the 40mm bore, 250mm stroke, 20mm adjust code, G1/4 port, PT thread, and confirm no magnet is required. At 250mm stroke, the 16mm rod is susceptible to side-load bending, so an external guide rail is strongly recommended to prevent premature seal failure.
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 MBLCJ40X250-20 FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 880N. The maximum theoretical force is 128 kgf at 1.0 MPa, with an operating pressure range of 0.15 to 1.0 MPa.
This specific SKU lacks the -S code, meaning it has no built-in magnet and cannot accept CMSG, DMSG, or EMSG position sensors. The 20mm rear adjuster is a travel stop that sets the end position (usable window 230-250mm), and the air cushion only decelerates the load; neither feature mechanically locks or holds the rod in place without continuous air pressure.
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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.
Related AirTAC Adjustable-Stroke Cylinders
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