Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S is a genuine double-acting aluminum-barrel mini cylinder with a Ø25mm bore, a 125mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 85–125mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke125 mm
- Adjustable85–125 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S
The AirTAC MBLCJ25X125-40S is a compact double-acting mini cylinder featuring a single rod and a riveted aluminum barrel. It delivers 245 N of push force at 0.5 MPa. The rear stroke stopper allows you to trim up to 40 mm of travel, creating a usable end-position window between 85 mm and 125 mm. Tunable air cushions at both ends absorb kinetic energy near the stroke ends, protecting the end covers from impact damage.
Equipped with a built-in magnet (-S), it supports CMSG reed and DMSG or EMSG solid-state sensor switches for position detection. The Ø10 mm carbon-steel rod features 20 μm hard-chrome plating to resist scuffing, while the grease-retaining piston seal maintains lubrication for a 30-800 mm/s speed range. The rear adjuster sets the travel end but does not lock the load; external guides are recommended for this 125 mm stroke to prevent rod bending.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 85–125 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 MBLCJ25X125-40S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×125 | 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 MBLCJ25X125-40S Is Used
PCB Depaneling Saw
Feeds a circular blade at 245 N push force, using the 85-125 mm window to set the exact cut depth and the air cushion to halt the carriage smoothly without jarring the fragile board.
Label Applicator Stopper
Tamps adhesive labels onto curved bottles; the tunable cushion decelerates the 125 mm travel to prevent label slippage, while the -S magnet triggers the DMSG sensor for a fast retraction signal.
Small Parts Ejector
Pushes molded plastic parts out of an injection mold cavity; the rear stopper dials the ejection stroke to 85 mm for short runs, preventing the rod from striking the machine frame.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X125-40S the Right Cylinder?
Stepping down to the 20 mm bore reduces thrust to 157 N, while stepping up to the 32 mm bore increases it to 402 N at 0.5 MPa. Choose this MBLCJ model over the MBLJ when your payload requires screw-tunable end-of-stroke deceleration rather than a fixed rubber bumper, or over the MBLC if you need variable travel limits. The rear adjuster and the air cushion regulate motion and impact, but neither acts as a mechanical lock—live air is required to hold position.
Mounting is restricted to Basic, FA flange, or LB foot brackets; SDB pivot and back-cover options are not available. For a drop-in replacement, match the 25 mm bore, 125 mm stroke, 40 mm adjust code, G1/8 port, PT thread, and the -S magnet. The overall length equals A + 2 x stroke + adjust.
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 MBLCJ25X125-40S FAQ
At 0.5 MPa, this 25 mm bore cylinder provides 245 N push and 206 N pull force. At 0.7 MPa, the push force is 343 N. The maximum theoretical force is 50 kgf at 1.0 MPa.
The rear adjuster is a mechanical travel stop that sets your usable stroke window between 85 mm and 125 mm. The adjustable air cushion only tunes end-of-stroke deceleration. Neither holds the load in place; the rod drifts without live 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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