Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40S 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 MBLCJ25X300-40S
The AirTAC MBLCJ25X300-40S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and a tunable air cushion at both ends. It delivers 245 N of push force and 206 N of pull force at 0.5 MPa. The 40 mm rear adjuster allows you to fine-tune the travel window anywhere between 260 mm and 300 mm. This 300 mm stroke reaches the maximum standard limit for a 25 mm bore, making the integrated magnet (-S) highly useful for timing end-of-stroke signals.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable pneumatic cushioning to decelerate heavy loads smoothly before impact. The riveted rolling-packed aluminum barrel pairs with a grease-retaining two-way piston seal and a Ø10 mm carbon-steel rod plated with 20 µm hard chrome. Keep in mind the rear stopper sets the travel end but does not lock the load, and the cushion only absorbs kinetic energy, not static force.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40S |
|---|---|
| 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 MBLCJ25X300-40S
| 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 MBLCJ25X300-40S Is Used
PCB Conveyor Diverter
Tunes the 260-300 mm extension to push populated PCB panels precisely into testing lanes, using the adjustable air cushion to prevent sudden stops from dislodging surface-mount components.
Bottle Sorting Gate
Trims the rear stroke by 40 mm to perfectly time the routing gate on a beverage filling line, absorbing the kinetic energy of the rod extension to protect the aluminum end covers.
Textile Loom Tensioner
Provides 245 N of pull at 0.5 MPa to maintain yarn tension on a high-speed loom, using the integrated magnet to trigger a DMSG sensor for rapid stroke-cycle counting.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-40S the Right Cylinder?
At 0.5 MPa, this 25 mm bore generates 245 N push and 206 N pull. If you need less force, step down to the 20 mm bore (157 N push), or step up to the 32 mm bore (402 N push) for heavier payloads. Choose this MBLCJ over the MBLJ when your moving mass requires tunable end-of-stroke deceleration rather than a fixed bumper, or over the MBLC when you need a rear travel stopper rather than a fixed total length.
Because the 300 mm stroke is the maximum standard limit for this bore, the Ø10 mm rod is highly susceptible to side-load bending over this distance; an external guide rail is strongly recommended. This cylinder lacks a back-cover option and cannot use an SDB pivot; mounting is limited to Basic, FA (flange), or LB (foot). For a direct replacement, match the 25 mm bore, 300 mm stroke, 40 mm adjust code, G1/8 PT port, and the -S magnet. The -S code allows solid-state DMSG or EMSG electronic sensors to track position, whereas a non-S SKU cannot accept any switch.
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 MBLCJ25X300-40S FAQ
At 0.5 MPa, the push force is 245 N and the pull force is 206 N. At 0.7 MPa, the push force is 343 N. The maximum theoretical force is 50 kgf at 1.0 MPa. The operating pressure range is 0.15 to 1.0 MPa.
The 40 mm rear adjuster is a mechanical travel stop that lets you set the usable extension window between 260 mm and 300 mm. The adjustable air cushion is a screw-tunable pneumatic valve that decelerates the piston near the end caps. Neither the stopper nor the cushion locks the load in place; you need live air or an external lock to hold position.
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