Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø25mm bore, a 40mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 20–40mm. Adjustable air cushion (both ends).
- BoreØ25 mm
- Stroke40 mm
- Adjustable20–40 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S
The AirTAC MBLCJ25X40-20S is a compact, double-acting mini round cylinder featuring a single rod and a lightweight riveted aluminum barrel. It delivers 245 N push and 206 N pull force at 0.5 MPa. A rear stroke stopper allows you to trim up to 20 mm of travel, creating a usable 20-40 mm end-position window for precise mechanical spacing. Unlike the base MBLJ, this SKU uses a screw-tunable air cushion at both ends to decelerate the rod near the stroke limits, absorbing impact energy to protect the end covers.
This specific model includes a built-in magnet (-S) for position detection using AirTAC CMSG (reed), DMSG, or EMSG (solid-state) switches. The Ø10 mm carbon-steel rod features 20 µm hard-chrome plating, and the heterogeneous two-way grease-retaining piston seal maintains lubrication over a 30-800 mm/s speed range. Remember that the rear adjuster is a travel stop, not a load lock; the cushion only decelerates, so external guides are needed if side loads exist.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø25 mm |
| Nominal stroke | 40 mm |
| Adjustable window | 20–40 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 MBLCJ25X40-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 25 | Bore size in mm. |
| ×40 | 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 MBLCJ25X40-20S Is Used
PCB Depaneling Router
Provides 245 N of push force to plunge a routing bit into FR-4 glass epoxy substrates, using the 20-40 mm stroke window to dial in the exact cutting depth.
Micro-Clamp Actuator
Tunes the end-of-stroke cushion to softly engage delicate electronic component clamps without shocking the aluminum tooling plate over a 40 mm travel.
Label Applicator Drum
Pivots a flexographic print drum over a 20-40 mm arc, using the integrated magnet to trigger a DMSG solid-state sensor for precise label registration.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S the Right Cylinder?
If you need less force, stepping down to the 20 mm bore yields 157 N push at 0.5 MPa, while stepping up to the 32 mm bore provides 402 N push. Choose the MBLCJ over the MBLJ when your moving mass requires active deceleration rather than a fixed rubber bumper, or over the MBLC when you need variable travel limits. To replace this cylinder, match the 25 mm bore, 40 mm stroke, 20 mm adjust code, G1/8 port, PT thread, and the -S magnet. Note that MBLCJ mounting is limited to Basic, FA, or LB; there is no SDB or back-cover option.
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 MBLCJ25X40-20S FAQ
At 0.5 MPa, this 25 mm bore cylinder outputs 245 N push and 206 N pull force. At 0.7 MPa, the push force is 343 N. The maximum theoretical thrust is 50 kgf at 1.0 MPa. The maximum standard stroke available for this bore size is 300 mm.
The rear stroke adjuster is a mechanical travel stop that lets you trim the usable stroke from 20 to 40 mm; it does not lock or hold the load. The adjustable air cushion is a screw-tunable valve that bleeds trapped air to decelerate the piston near the end covers, preventing impact damage. Neither feature acts as a brake.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Adjustable-Stroke Cylinders
Request a Quote for Airtac MBLCJ Adjustable Mini Cylinder MBLCJ25X40-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.