Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-20S 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 20mm for a usable window of 230–250mm. Adjustable air cushion (both ends).
- BoreØ20 mm
- Stroke250 mm
- Adjustable230–250 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 MBLCJ20X250-20S
The AirTAC MBLCJ20X250-20S is a compact double-acting aluminum mini cylinder featuring a built-in magnet and a rear travel stopper. It integrates an adjustable stroke mechanism allowing you to trim up to 20 mm of travel, creating a usable end-position window of 230-250 mm. Delivering 157 N of push force at 0.5 MPa, it is designed for applications needing exact end-stop tuning rather than a fixed length.
Unlike the base MBLJ which relies on a fixed rubber bumper, this model features a screw-tunable adjustable air cushion at both ends to decelerate the rod gently. The riveted rolling-packed aluminum barrel and 20 um hard-chrome plated carbon-steel rod ensure durability, while the grease-retaining two-way piston seal maintains consistent lubrication. The -S magnet enables position detection using AirTAC CMSG reed or DMSG/EMSG solid-state switches.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø20 mm |
| Nominal stroke | 250 mm |
| Adjustable window | 230–250 mm (trim 20 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 MBLCJ20X250-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 20 | 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 MBLCJ20X250-20S Is Used
PCB Router Z-Axis
Governs the plunge depth of a spindle motor on a desktop PCB router, using the 230-250 mm window to dial in the exact cutting depth while the air cushion prevents bounce at high traverse speeds.
Dispenser Valve Timing
Actuates a metering valve for epoxy dispensing on a ceramic substrate line, using the 157 N push force to crack the nozzle open and the tunable cushion to stop the rod without jarring the fluid chamber.
Wire Straightener Tensioner
Feeds wire through a capstan in a spring winding machine, using the 250 mm stroke to maintain tension and the rear adjuster to fine-tune the slack loop length precisely.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ20X250-20S the Right Cylinder?
For tasks needing less force, stepping down to the 16 mm bore (if available) or 12 mm bore offers a lighter footprint, while stepping up to the 25 mm bore increases output to 245 N push at 0.5 MPa for heavier resistance. Choose the MBLCJ over the MBLJ when your cycle times require tuned end-of-stroke deceleration to protect the end covers from impact. The rear stopper sets the travel end and the cushion only decelerates; neither holds the load, so an external guide or lock is required for position holding. Mounting is limited to Basic, FA flange, or LB foot options (no SDB or back-cover code). When replacing, match the 20 mm bore, 250 mm stroke, 20 mm adjust code, G1/8 port, PT thread, and -S magnet. At 250 mm stroke, the 8 mm rod is susceptible to side-load bending, requiring an external guide to prevent premature seal wear.
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 MBLCJ20X250-20S FAQ
At 0.5 MPa, the push force is 157 N and the pull force is 132 N. At 0.7 MPa, the push force is 220 N. The maximum theoretical force is 32 kgf at 1.0 MPa, with an operating pressure range of 0.15-1.0 MPa.
The adjustable stroke uses a rear stopper to trim the travel end, providing a usable window of 230-250 mm for this specific SKU. The adjustable air cushion is a separate screw-tunable valve that controls deceleration near the stroke ends to prevent impact. The stopper sets the position; the cushion softens the stop. Neither acts as a lock.
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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.
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