Airtac MFJ Adjustable Mini Cylinder MFJ40X50-40
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X50-40 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 MFJ40X50-40
Trimming the extend stroke by up to 20 mm on site, this double-acting JIS-standard round-body mini cylinder lets you dial in the end position without buying a new unit or adding external stops. The riveted aluminium covers and SUS304 stainless barrel yield a shorter overall length than an ISO 6432 cylinder for the same 40 mm bore and 50 mm stroke, while resisting mild washdown.
Delivering 628.3 N of push force at 0.5 MPa, it serves as a robust mid-size actuator. The fixed TPU bumper pads absorb end-of-stroke impacts across the 30-800 mm/s speed range, and the 1/4" port matches the Ø16 mm rod. Based on the 0.5 MPa thrust, you get a safe working load around 377 N, lifting roughly 32 kg vertically with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X50-40 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X50-40 |
|---|---|
| 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 MFJ40X50-40
| 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 MFJ40X50-40 Is Used
Changeover Dial-In
Fine-tune the extend position during product format changes by turning the 20 mm adjuster, avoiding the need to swap out the entire cylinder.
Trial Fit Actuation
Leverage the 628.3 N push force to press components into place during prototyping, dialing back the stroke 20 mm to prevent over-travel.
Variable Ejector Stop
Set precise ejection endpoints on the fly for parts of varying lengths, using the SUS304 body in light washdown environments.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X50-40 the Right Cylinder?
When sizing between the two available bores, the MFJ40 provides 628.3 N push at 0.5 MPa versus 402.2 N on the MFJ32, making this 40 mm bore the right pick when you need that extra thrust margin. The 20 mm adjustable window is ideal for trial fits and line changeovers where the exact extend position is not yet final. Remember that the adjuster only sets the end position; it does not lock the rod. If you need to hold a load against air loss, add an external rod lock or pilot check valve. Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors.
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 MFJ40X50-40 FAQ
This 40 mm bore double-acting cylinder features a 1/4" port and a Ø16 mm rod with an M14x1.5 male thread. It delivers 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 20 mm on site, letting you set the exact end position without external stops. The cylinder uses fixed TPU bumper pads to decelerate the stroke end, not an adjustable air cushion. Note that this SKU has no -S magnet, so it cannot accept position sensors.
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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