Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20 is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 30mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 10–30mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke30 mm
- Adjustable10–30 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20
The AirTAC MBLCJ40X30-20 is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. You can trim up to 20 mm of rear travel, giving an effective usable stroke window of 10 to 30 mm. Driven by a Ø16 mm carbon-steel rod with 20 µm hard-chrome plating, it generates 628 N push and 528 N pull force at 0.5 MPa. The riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal keep friction low while surviving harsh industrial environments.
This specific SKU lacks the -S code, meaning no built-in magnet is fitted and it cannot host a CMSG, DMSG, or EMSG position sensor. The adjustable air cushion allows you to screw-tune end-of-stroke deceleration to protect the end covers during fast, heavy moves, which is a distinct advantage over the fixed rubber bumper found on the base MBLJ series. Remember that the rear stopper sets the travel end position; it does not lock or hold the load in place.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20 Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20 |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 30 mm |
| Adjustable window | 10–30 mm (trim 20 mm) |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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 MBLCJ40X30-20
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MBLCJ40X30-20 Is Used
PCB Router Spindle
Provides 628 N of push force at 0.5 MPa to plunge a high-speed routing spindle into FR-4 fiberglass boards, using the 10-30 mm stroke window to dial in exact cutting depth.
Bottle Capper Head
Tunes the adjustable air cushion to softly press 40 mm caps onto filled glass containers, preventing glass shatter while maintaining a rigid 528 N pull on the upstroke.
Plastic Trim Punch
Drives a small punch to cut automotive interior trim, relying on the 20 µm hard-chrome plated rod to resist deflection during the rapid 30 mm cutting stroke.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X30-20 the Right Cylinder?
Stepping down to the Ø32 bore drops the output to 402 N push at 0.5 MPa, while moving up to the Ø50 bore raises it to 981 N. Choose this Ø40 model when your application demands roughly 628 N of push force within a tight 10 to 30 mm travel window. The MBLCJ is preferred over the MBLJ when you need tunable pneumatic cushioning to dissipate kinetic energy, and over the MBLC when the fixed stroke needs shortening at the rear.
For an exact replacement, match the 40 mm bore, 30 mm nominal stroke, 20 mm adjust code, G1/4 port, PT thread, and Basic/FA/LB mounting. Note that the MBLCJ series has no back-cover or SDB pivot options. Because the overall length equals A + 2 x stroke + adjust, the body is slightly longer than a fixed-stroke cylinder. The adjuster is a travel stop, not a lock; the rod will drift without live air pressure, so use an external guide for side-load stability.
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 MBLCJ40X30-20 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa.
The rear adjuster physically stops the piston to trim travel between 10 and 30 mm, but it is not a lock and will not hold a load without live air. The adjustable air cushion only controls deceleration speed at the stroke ends to prevent end-cover damage. Additionally, this specific SKU lacks a built-in magnet, so it cannot accept CMSG reed or DMSG electronic sensors.
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