Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 50mm stroke, 1/4" air ports and a SUS304 stainless-steel barrel for mildly corrosive environments. For the same bore and stroke it is shorter than an ISO 6432 cylinder, saving mounting space.
- BoreØ40 mm
- Stroke50 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
- 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 MFJ Adjustable Mini Cylinder MFJ40X50-30S
Dial in your extend end-point on the fly with the AirTAC MFJ40X50-30S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 30 mm directly on the machine, removing the need to swap hardware or bolt on external stops when the final position is not yet locked in. Because the -S suffix includes a piston magnet, this unit is ready for CMSG, DMSG, or EMSG position switches.
In the 40 mm bore class, this double-acting actuator delivers 628.3 N of push force and 527.8 N of pull force at 0.5 MPa, peaking at a theoretical 128.1 kgf at 1.0 MPa. For practical sizing, that translates to a safe working load of roughly 377 N, or lifting about 32 kg vertically with a 2:1 safety margin. The riveted body is shorter than a comparable ISO 6432 cylinder for the same stroke, saving valuable mounting length, while the 1/4" port and M14x1.5 male rod thread keep plumbing standard.
Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/4" |
| 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 | Fixed TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MF/MFC (JIS-standard) datasheet. Barrel: SUS304 stainless steel; covers: aluminum alloy (round-body, riveted rolling-packed construction). Thread options: PT (blank) / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MF-family variants: MF / MFC (double acting ±cushion), MSF / MTF (single acting push / pull), MFD / MFCD (double rod ±cushion), MFJ / MFCJ (adjustable stroke ±cushion). Back covers CA / U / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S Is Used
Changeover Stations
Fine-tune the extend stroke by up to 30 mm during product changeovers, letting one cylinder adapt to multiple part sizes without swapping the actuator.
Prototype Rigs
Perfect for trial assemblies where the final push position is undefined, using the 628.3 N thrust to test engagement before locking the adjuster down.
Variable Position Stops
Acts as an adjustable hard stop for 40 mm bore tooling tasks, providing precise end-position tuning without machining separate external stop collars.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S the Right Cylinder?
When choosing between the two available bores, match your load to the real thrust figures. This 40 mm bore pushes 628.3 N at 0.5 MPa, whereas the smaller MFJ32 delivers 402.2 N at the same pressure. If your load approaches 40 kg, the 40 mm bore is the safer choice; the 32 mm is better for lighter pick-and-place tasks. The 30 mm adjustable window here is especially useful for trial fits and line changeovers where the exact extend position is unknown during commissioning.
Keep in mind that the fixed TPU bumper pads only decelerate the piston near the end of travel—they do not lock or hold the load. If air pressure drops, the rod will drift, so add an external rod lock or pilot check valve for suspended loads. For mounting, you can use LB foot, FA flange, or TC trunnion brackets (there is no SDB or back-cover option on this build).
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MFJ Adjustable Mini Cylinder MFJ40X50-30S FAQ
This 40 mm bore double-acting cylinder pushes 628.3 N and pulls 527.8 N at 0.5 MPa, and pushes 879.6 N / pulls 738.9 N at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa. It operates at 30-800 mm/s, uses a 1/4" port, and features a 16 mm rod with an M14x1.5 male thread.
The external adjuster shortens the extend stroke by up to 30 mm on site (usable extend 20-50 mm) without changing the full retract distance; it only sets the end position and is not a mid-stroke lock. The -S suffix means it has a built-in piston magnet for CMSG, DMSG, or EMSG sensors, and it relies on fixed TPU bumper pads for end-of-stroke deceleration.
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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