Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X125-20S
The AirTAC Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X125-20S is a genuine double-acting aluminum-barrel mini cylinder with a Ø40mm bore, a 125mm nominal stroke and a rear adjustable-stroke stopper — trim up to 20mm for a usable window of 105–125mm. Adjustable air cushion (both ends).
- BoreØ40 mm
- Stroke125 mm
- Adjustable105–125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- 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 MBLCJ40X125-20S
The AirTAC MBLCJ40X125-20S is a compact double-acting aluminum mini cylinder featuring a rear stroke adjuster and an adjustable air cushion at both ends. It delivers 628 N of push force at 0.5 MPa through a Ø16 mm hard-chrome plated carbon steel rod. The rear stopper lets you trim up to 20 mm of travel, creating a usable stroke window of 105-125 mm for exact end-positioning. Equipped with a built-in magnet (-S), it supports CMSG, DMSG, and EMSG sensor switches for rod position detection.
Unlike the fixed rubber bumper found on the base MBLJ, this model uses screw-tunable end-of-stroke cushioning to decelerate heavier loads smoothly, protecting the end covers. The riveted rolling-packed barrel and heterogeneous two-way grease-retaining piston seal ensure long service life. Note that the rear adjuster is a travel stop, not a lock; it sets the end position but does not hold the load pneumatically. Overall length extends by the adjustment dimension.
Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X125-20S Technical Specifications
| Model | Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X125-20S |
|---|---|
| Series | MBL aluminum-barrel mini round cylinder (adjustable stroke) |
| Bore size | Ø40 mm |
| Nominal stroke | 125 mm |
| Adjustable window | 105–125 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 MBLCJ40X125-20S
| MBLCJ | MBLCJ aluminum-barrel adjustable-stroke mini cylinder with adjustable cushion. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MBLCJ40X125-20S Is Used
PCB Drill Bit Changer
Provides the 628 N push force required to actuate a tool-changing carousel, using the 105-125 mm adjustable window to dial in exact bit handoff depth.
Stator Winding Press
Uses the adjustable air cushion to decelerate the 125 mm stroke smoothly when pressing copper wire wedges, preventing impact damage to the end covers.
Carton Flap Folder
Cycles at high speed to fold corrugated box flaps, relying on the DMSG electronic sensor to confirm full extension for the packaging line sequencer.
Is the Airtac MBLCJ Adjustable Mini Cylinder MBLCJ40X125-20S the Right Cylinder?
Choose this 40 mm bore when an application demands 628 N push force at 0.5 MPa. If your payload is lighter, step down to the 32 mm bore (402 N push); if you need more power, step up to the 50 mm bore (981 N push). Select MBLCJ over the MBLJ when you need tunable end-deceleration instead of a fixed bumper, or over the MBLC when you require the rear travel adjuster. The 20 mm adjuster sets the stroke end but will not hold a load in place without live air pressure.
Mounting is limited to Basic, FA (flange), or LB (foot); there is no back-cover or SDB pivot option. The port is G1/4 with a PT thread form, and the rod-end thread is M12x1.25. For exact replacement matching, verify the 40 mm bore, 125 mm stroke, 20 mm adjust code, PT port, and the -S magnet. Because the stroke is 125 mm, ensure external guiding 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 MBLCJ40X125-20S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At 0.7 MPa, the push force increases to 880 N. The maximum theoretical force is 128 kgf at 1.0 MPa. The operating pressure range is 0.15-1.0 MPa.
The rear adjustable stroke is a mechanical stopper that trims the travel window to 105-125 mm; it sets the end position but is not a lock. The adjustable air cushion is a screw-tunable valve that controls deceleration near the stroke ends to absorb kinetic energy, unlike the fixed bumper on an MBLJ.
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.
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