Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S 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 20mm for a usable window of 280–300mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke300 mm
- Adjustable280–300 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S
The AirTAC MBLCJ25X300-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke stopper and twin adjustable air cushions. It delivers 245 N push and 206 N pull at 0.5 MPa. The 20 mm rear adjuster creates a 280-300 mm usable travel window, ideal for fine-tuning the end position on long-travel packaging machinery.
Unlike the fixed rubber bumper on an MBLJ, the screw-tunable cushions decelerate the rod at both ends to absorb kinetic energy from fast 300 mm moves. The riveted aluminum barrel and 20 µm hard-chrome plated Ø10 mm carbon-steel rod withstand wear. The built-in -S magnet supports CMSG reed and DMSG/EMSG solid-state sensors for position feedback. Remember, the rear stopper sets travel length and the cushion governs deceleration; neither holds a load statically without live air.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 300 mm |
| Adjustable window | 280–300 mm (trim 20 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 MBLCJ25X300-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×300 | 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 MBLCJ25X300-20S Is Used
Flow-Wrap Carton Sealing
Tunes the 280-300 mm push stroke to precisely drive the sealing jaw on continuous flow-wrap packaging lines, using the twin cushions to arrest the 245 N thrust smoothly.
Textile Beam Indexing
Shifts heavy fabric beams along a 300 mm track; the adjustable rear stopper dials in the exact cut-off point while the air cushion softens the high-speed rod impact.
PCB Conveyor Sorting
Uses the -S magnet with DMSG electronic switches to confirm actuator position when rejecting populated PCBs off a 300 mm transfer lane at 0.5 MPa.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X300-20S the Right Cylinder?
At 245 N push (0.5 MPa), this 25 mm bore suits medium-duty actuation. If you need less force, step down to the 20 mm bore (157 N push); for heavier loads, step up to the 32 mm bore (402 N push). Choose this MBLCJ over an MBLJ when you need tunable end-deceleration to protect end covers from high-impact cycling, or over an MBLC when your machine requires a variable 280-300 mm end-point.
Because the 300 mm stroke hits the maximum standard limit for a 25 mm bore, the small Ø10 mm rod is highly susceptible to side-load bending; an external guide rail is mandatory. Mounting is limited to Basic, FA flange, or LB foot (no SDB pivot or back-cover). For a drop-in replacement, match the 25 mm bore, 300 mm stroke, 20 mm adjust code, G1/8 PT port, and the -S magnet. The adjuster and cushions are not brakes—they will not hold position if air pressure drops.
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 MBLCJ25X300-20S FAQ
At 0.5 MPa it provides 245 N push and 206 N pull. At 0.7 MPa the push increases to 343 N. The maximum theoretical force is 50 kgf at 1.0 MPa.
The 20 mm rear adjuster is a mechanical travel stop that sets your usable stroke window between 280-300 mm. The adjustable air cushion is a screw valve that regulates exhaust flow to decelerate the piston near the end covers. Neither component is a lock; they cannot hold a load statically without continuous air pressure.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Most inquiries answered within 7-8 hours.
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