Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40 is a genuine double-acting aluminum-barrel mini cylinder with a Ø20mm bore, a 250mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 210–250mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke250 mm
- Adjustable210–250 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM8×1.25
- CushionAdjustable air cushion (both ends)
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40
The AirTAC MBLCJ20X250-40 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and tunable air cushions at both ends. It delivers 157 N of push force and 132 N of pull force at 0.5 MPa. The 40 mm rear trimmer creates a usable travel window of 210 to 250 mm, letting you dial in the exact end position without moving the physical mounting blocks.
Unlike the fixed rubber bumper found on the base MBLJ, the screw-tunable cushions on this unit allow you to regulate end-of-stroke deceleration, absorbing kinetic energy to protect the end covers during faster cycles. This SKU is built without a magnet, so it cannot accept a CMSG reed or DMSG electronic sensor for position detection. The riveted rolling-packed barrel and 20 um hard-chrome plated carbon-steel rod seal with a grease-retaining piston ring for low-friction operation.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 210–250 mm (trim 40 mm) |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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 MBLCJ20X250-40
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | Bore size in mm. |
| ×250 | 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 MBLCJ20X250-40 Is Used
PCB Edge Router Feed
Pushes a 250 mm travel shuttle carrying printed circuit boards into a depaneling router, using the 40 mm rear stopper to fine-tune the cutting depth precisely.
Dispenser Valve Probing
Drives a fluid dispensing nozzle down 210-250 mm, relying on the dual adjustable air cushions to prevent splashing by gently decelerating the 157 N thrust at stroke end.
Thin Film Web Tracking
Actuates a guiding roller for packaging film, where the compact 20 mm body fits narrow machine frames and the tunable cushions stop the guide without snapping the web.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40 the Right Cylinder?
Choose this 20 mm bore when you need 157 N push at 0.5 MPa in a tight footprint. If your payload is lighter, stepping down is not an option as 20 mm is the smallest available size; however, if you need more thrust, the 25 mm bore provides 245 N. This MBLCJ variant is preferred over the MBLJ when your moving mass requires tunable end-of-stroke deceleration rather than a fixed bumper, and over the MBLC when you need the 210-250 mm adjustable travel window.
Remember the rear adjuster is a travel stop, not a lock; it sets the end position but does not hold the load against drift, so external locking is required for true position holding. Mounting is limited to Basic, FA flange, or LB foot styles, as there is no back-cover or SDB pivot option. For a drop-in replacement, match the 20 mm bore, 250 mm stroke, 40 mm adjust code, G1/8 port, PT thread, and confirm no magnet is needed. Because the stroke is 250 mm on an 8 mm rod, external guide rails are highly recommended to prevent rod bending under side loads.
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 MBLCJ20X250-40 FAQ
At 0.5 MPa, this 20 mm bore cylinder provides 157 N push and 132 N pull force. At 0.7 MPa, the push force increases to 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa.
This specific SKU lacks a built-in magnet, so it cannot accept CMSG, DMSG, or EMSG position switches. The 40 mm adjustment is a rear mechanical travel stop that sets your usable window between 210 and 250 mm; it is not a lock. The separate adjustable air cushion screws only tune the end-of-stroke deceleration rate and also do not hold the load.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC Adjustable-Stroke Cylinders
Request a Quote for Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.