Airtac MBLCJ Adjustable Mini Cylinder MBLCJ50X250-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ50X250-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø50mm bore, a 250mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 230–250mm. Adjustable air cushion (both ends).
- BoreØ50 mm
- Stroke250 mm
- Adjustable230–250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM14×1.5
- 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 MBLCJ50X250-20S
The AirTAC MBLCJ50X250-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 981 N of push force at 0.5 MPa, making it well-suited for moving heavier jigs over its 250 mm travel. The rear stopper allows you to trim up to 20 mm of travel, creating a precise 230-250 mm usable stroke window for exact end-of-cycle positioning.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model uses screw-tunable end-of-stroke deceleration to absorb kinetic energy, protecting the end covers during fast moves. The riveted rolling-packed barrel and 20 um hard-chrome plated carbon-steel rod ensure durability. Equipped with a built-in magnet (-S), it supports AirTAC CMSG, DMSG, and EMSG sensor switches for rod position detection. Note that the rear adjuster is a travel stop, not a lock; it sets the end position but does not hold the load against drift.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ50X250-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ50X250-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 230–250 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M14×1.5 |
| 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 500 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 881 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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 MBLCJ50X250-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 50 | Bore size in mm. |
| ×250 | 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 MBLCJ50X250-20S Is Used
Injection Mold Ejection
Provides the 981 N push force needed to eject dense plastic parts from molds, using the 230-250 mm adjustable window to time the exact knockout stroke.
Packaging Press Sealing
Tunes the end-of-stroke air cushion to softly decelerate a 250 mm sealing press head, preventing package crushing while maintaining a fast cycle rate.
Textile Loom Beater
Drives a heavy weaving reed back and forth across the 250 mm stroke, relying on the built-in magnet to trigger DMSG electronic sensors for loom timing.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ50X250-20S the Right Cylinder?
Choose this 50 mm bore when you need 981 N of push force at 0.5 MPa (1374 N at 0.7 MPa). If your payload is lighter, stepping down to the 40 mm bore yields 628 N push force, whereas stepping up to the 63 mm bore provides 1558 N. This SKU replaces any cylinder requiring a 50 mm bore, 250 mm stroke, 20 mm rear adjustment, G1/4 port, PT thread, and a magnet. Mounting is limited to Basic, FA (flange), or LB (foot); no SDB pivot or back-cover options exist for this body type.
Because the 250 mm stroke is relatively long for a mini cylinder, the Ø16 mm rod is susceptible to side-load bending; always use an external guide rail to support the payload. The adjustable air cushion only decelerates the piston near the stroke ends and does not function as a braking or load-holding device.
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 MBLCJ50X250-20S FAQ
At 0.5 MPa, this 50 mm bore cylinder outputs 981 N push and 881 N pull force. At 0.7 MPa, push increases to 1374 N. The theoretical maximum force is 200 kgf at 1.0 MPa. The 250 mm stroke is within the 500 mm standard maximum limit for this bore size.
The 20 mm adjustable stroke is a mechanical rear stopper that physically limits the rod travel, creating a 230-250 mm usable window. The adjustable air cushion is a separate needle valve that controls end-of-stroke deceleration speed. Neither component locks or holds the load in place; they only set travel length and slow the piston.
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
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