Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40 is a genuine double-acting aluminum-barrel mini cylinder with a Ø25mm bore, a 300mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 260–300mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke300 mm
- Adjustable260–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40
The AirTAC MBLCJ25X300-40 is a double-acting, single-rod aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. The 40mm rear adjustment creates a usable travel window of 260-300mm, letting you dial in exact end positions without machining spacers. Delivering 245N of push force at 0.5 MPa, it suits long-travel positioning tasks in tight assemblies.
Unlike the fixed rubber bumper on an MBLJ, this model's screw-tunable cushion actively decelerates the rod near the stroke ends, absorbing kinetic energy to protect the end covers during fast 30-800 mm/s cycles. Note that this specific SKU lacks the -S magnet option, meaning it cannot support CMSG, DMSG, or EMSG position sensors. The riveted rolling-packed barrel and 20 um hard-chrome plated carbon-steel rod ensure durability, though the 300mm stroke on a Ø10mm rod makes external guide rails critical to prevent side-load bending.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 260–300 mm (trim 40 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| 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 300 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | — |
| Max (@1.0 MPa) | 50 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 MBLCJ25X300-40
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×300 | 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 MBLCJ25X300-40 Is Used
Textile Loom Let-off
Regulates yarn tension on long weaving looms, using the 260-300mm window to compensate for fabric take-up while the air cushion softens rapid directional changes.
Conveyor Diverter Gate
Actuates sorting flaps on packaging lines, where the tunable cushion prevents the 245N stroke from violently slamming the flap into its hard stop at high speeds.
Sliding Door Panel Indexer
Moves heavy cabinet doors along a 300mm track, requiring external linear rails to support the panel weight and prevent side-loading on the Ø10mm rod.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40 the Right Cylinder?
Stepping down, the Ø20 bore provides 157N push at 0.5 MPa, which is too weak for heavy 300mm-travel loads; stepping up to the Ø32 bore yields 402N, offering far better stability for pushing rigid jigs. Choose the MBLCJ over the MBLJ when you need active end-cover protection from impact forces, or the MBLC variant if your travel distance never needs trimming. Remember, the 40mm rear mechanism acts purely as a travel stop, and the cushion only decelerates—neither will lock or hold a load pneumatically without live air. Mounting is restricted to Basic, FA, or LB foot brackets, with no SDB or back-cover options available. For exact drop-in replacements, match the 25mm bore, 300mm stroke, 40mm adjust, G1/8 PT port, and no-magnet configuration.
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 MBLCJ25X300-40 FAQ
At 0.5 MPa, this 25mm bore cylinder outputs 245N push and 206N pull force. At 0.7 MPa, the push increases to 343N. The maximum theoretical force is 50 kgf at the 1.0 MPa operating pressure limit, with a proof pressure of 1.5 MPa.
The 40mm adjustment lets you mechanically trim the rear travel end, creating a usable stroke window of 260-300mm. This rear stopper sets the end position, while the adjustable air cushion only manages deceleration—neither component mechanically locks or holds the load in place without continuous air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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