Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 40mm nominal stroke and a rear adjustable-stroke stopper — trim up to 40mm for a usable window of 0–40mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke40 mm
- Adjustable0–40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable air cushion (both ends)
About the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S
The AirTAC MBLCJ40X40-40S is a compact double-acting mini cylinder featuring a single rod and a riveted aluminum barrel. It integrates a rear stroke adjuster that allows you to trim up to 40 mm of travel, creating a usable end-position window from 0 to 40 mm. Driven by a Ø16 mm carbon-steel rod with 20 µm hard-chrome plating, it generates 628 N of push force and 528 N of pull force at 0.5 MPa. The built-in magnet (-S) supports position detection.
This model pairs the rear travel stop with an adjustable air cushion at both ends. Unlike the fixed rubber bumper found on the MBLJ series, the screw-tunable cushion allows you to regulate end-of-stroke deceleration for heavier 628 N loads, protecting the end covers from impact. The heterogeneous two-way grease-retaining piston seal maintains lubrication across the 30-800 mm/s speed range. Remember that the rear adjuster is a travel stop, not a mechanical lock—it sets the end point but does not hold the load without live air pressure.
Configured with PT threaded ports (G1/4), this SKU is designed for precise positioning. The -S magnet enables use with AirTAC CMSG (reed) and DMSG or EMSG (solid-state electronic) sensor switches. The overall length follows the formula A + 2 x stroke + adjust, meaning the cushion and adjustment mechanisms add to the total footprint compared to a fixed-stroke MBLC cylinder.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 40 mm |
| Adjustable window | 0–40 mm (trim 40 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 MBLCJ40X40-40S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MBLCJ40X40-40S Is Used
Injection Mold Ejection
Uses the 0-40 mm adjustable stroke window to precisely set ejection length for varying plastic part depths, while the tunable air cushion decelerates the 628 N push force to prevent marring finished surfaces.
Printed Circuit Board Testing
Leverages the -S magnet with a DMSG solid-state sensor to verify test probe contact, relying on the adjustable end-position to dial in exact probe depth without repositioning the entire fixture.
Textile Fabric Guiding
Employs the 528 N pull force at 0.5 MPa to tension and guide fabric webs, using the rear stopper to define a strict 40 mm maximum travel limit that prevents overstretching delicate materials.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X40-40S the Right Cylinder?
When sizing this 40 mm bore cylinder, consider stepping down to the 32 mm bore if your application requires less than 402 N of push force at 0.5 MPa, or stepping up to the 50 mm bore if you need 981 N to handle heavier payloads. The MBLCJ40X40-40S is ideal when you need both a variable end-stop and tunable deceleration, whereas the MBLJ provides a fixed bumper for lighter impacts, and the MBLC offers a fixed stroke if your travel distance never changes.
For an exact replacement, match the 40 mm bore, 40 mm stroke, 40 mm adjust code, G1/4 port, PT thread, and the -S magnet. Mounting is limited to Basic, FA (flange), or LB (foot) styles, as this series does not accept SDB pivots or back-cover options. Because the stroke is 40 mm, side-load risks are minimal, but always guide the load externally rather than relying on the 16 mm rod. Neither the rear travel stopper nor the adjustable air cushion acts as a load-holding brake; the rod will drift without sustained air pressure.
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 MBLCJ40X40-40S 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 adjustable stroke is a mechanical travel stop that lets you trim the end position within a 0-40 mm window. The adjustable air cushion is a screw-tunable valve that regulates end-of-stroke deceleration speed. Neither holds the load in place; the cylinder requires live air to maintain position.
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