Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-30S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-30S 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 30mm for a usable window of 220–250mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke250 mm
- Adjustable220–250 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 MBLCJ40X250-30S
The AirTAC MBLCJ40X250-30S 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. The 30 mm rear stopper lets you trim the travel down, creating a usable extension window of 220 to 250 mm—ideal for fine-tuning the endpoint of a 250 mm cycle without machining hard stops.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable end-of-stroke cushioning to decelerate heavier loads smoothly. The riveted rolling-packed barrel houses a Ø16 mm carbon-steel rod with 20 µm hard-chrome plating, paired with a grease-retaining piston seal. The built-in magnet (-S) supports CMSG reed and DMSG/EMSG electronic sensors for position detection. Note that the rear adjuster is a travel stop, not a lock; it sets the end point but cannot hold a load in place without live air pressure.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-30S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-30S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 220–250 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 MBLCJ40X250-30S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MBLCJ40X250-30S Is Used
Packaging Conveyor Diverter
Pushes heavy cartons at 0.5 MPa with 628 N of force, using the 220-250 mm adjustable window to fine-tune the divert arm reach without moving the mounting block.
CNC Lathe Door Operator
Utilizes the adjustable air cushion to softly decelerate the 250 mm stroke, preventing slamming of the heavy sliding safety door at the end of travel.
Woodworking Panel Press
Applies 880 N of clamping thrust at 0.7 MPa to hold veneer panels, relying on the DMSG electronic sensor to confirm the press is fully extended before the glue heater activates.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X250-30S the Right Cylinder?
Choose this 40 mm bore when you need 628 N of thrust at 0.5 MPa. If your payload is lighter, step down to the 32 mm bore (402 N push); if you need more power, step up to the 50 mm bore (981 N push). This SKU is preferred over the MBLJ when your moving mass requires tunable pneumatic deceleration to protect the end covers, and over the MBLC when you need to dial in the 220-250 mm travel window rather than using a fixed length.
For exact replacements, match the 40 mm bore, 250 mm stroke, 30 mm adjust code, G1/4 port, M12x1.25 rod thread, PT thread form, and the -S magnet. Mounting is limited to Basic, FA flange, or LB foot (no SDB or back-cover options). Because the overall length is A + 2 x stroke + adjust and the stroke is 250 mm, the 16 mm rod is susceptible to bending under lateral stress—always use an external guide rail for side-load protection.
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 MBLCJ40X250-30S 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 increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa. It operates at speeds between 30 and 800 mm/s.
The 30 mm rear adjuster is a mechanical travel stop that physically limits the rod extension, giving you a 220-250 mm usable window. The adjustable air cushion is a separate needle valve that tunes the pneumatic deceleration at the stroke ends to absorb kinetic energy. Neither feature locks or holds the load in place without continuous air pressure.
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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