Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-40
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-40 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 40mm for a usable window of 210–250mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke250 mm
- Adjustable210–250 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 MBLCJ40X250-40
The AirTAC MBLCJ40X250-40 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. A G1/4 port feeds the Ø16 carbon-steel rod, generating 628 N of push force and 528 N of pull force at 0.5 MPa. The rear stopper trims up to 40 mm of travel, providing a usable stroke window from 210 to 250 mm to dial in exact end positions.
Unlike the fixed rubber bumper on an MBLJ, the screw-tunable cushion valve on this unit decelerates heavy 250 mm moves to protect the end covers. Because this specific SKU lacks the -S magnet code, it cannot accept an AirTAC CMSG, DMSG, or EMSG position sensor. The riveted rolling-packed barrel and grease-retaining two-way piston seal maintain smooth operation at speeds between 30 and 800 mm/s.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-40 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 210–250 mm (trim 40 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 MBLCJ40X250-40
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Nominal stroke length in mm. |
| -40 | 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 MBLCJ40X250-40 Is Used
CNC Lathe Bar Feeder
Pushes raw bar stock through a spindle with 628 N of force, using the 210-250 mm adjustable stroke window to accommodate varying material lengths without repositioning the cylinder.
Injection Mold Ejection
Uses the tunable air cushion to gently decelerate the 880 N force at 0.7 MPa when stripping plastic parts from a mold, preventing marking on hot components.
Pallet Diverting Arm
Swings a mechanical gate to sort heavy pallets on a packaging line, relying on the LB foot mount to handle the 528 N pull load during rapid retraction.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-40 the Right Cylinder?
Stepping down to the 32 mm bore drops the 0.5 MPa push force to 402 N, while stepping up to the 50 mm bore increases it to 981 N for heavier payloads. Choose this MBLCJ over an MBLJ when your application requires tuned end-of-stroke deceleration rather than a basic fixed bumper, or over an MBLC when you need that rear travel stopper to trim the 210-250 mm window. Remember that the rear adjuster is a travel stop, not a lock; the cushion only decelerates, so use an external locking device for true load holding. Mounting is limited to Basic, FA flange, or LB foot brackets (no SDB pivot or back-cover options exist). To replace this exact unit, match the 40 mm bore, 250 mm stroke, 40 mm adjust code, G1/4 port, PT thread, and confirm no magnet is fitted. At 250 mm, the long stroke combined with the 16 mm rod makes it highly susceptible to side-load bending, so guide the load externally.
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 MBLCJ40X250-40 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N push and 528 N pull. At 0.7 MPa, the push increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa.
The rear adjustable stroke is a mechanical travel stop that trims the usable stroke window to 210-250 mm, setting the exact end position. The adjustable air cushion is a screw-tunable valve that controls end-of-stroke deceleration. Neither holds the load in place; they only stop and slow the rod.
Authorized Export Seller
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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