Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50SFA
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50SFA 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 MFJ40X50-50SFA
Trimming the extend end by up to 50 mm on site, this double-acting JIS-standard round-body mini cylinder removes the need to swap hardware when tuning end positions. The SUS304 stainless barrel and riveted aluminium covers form a compact body that is physically shorter than an equivalent ISO 6432 unit, while the built-in piston magnet (-S) supports CMSG, DMSG or EMSG switches for end-of-stroke detection.
Fitted with a 1/4" port and an M14x1.5 male rod thread on a 16 mm piston rod, the 40 mm bore delivers 628.3 N of push force at 0.5 MPa. Fixed TPU bumper pads absorb impact at the stroke extremes, and the included FA flange simplifies face mounting. For vertical lifting, the bore yields a safe working load of about 377 N, lifting roughly 32 kg with a 2:1 safety margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50SFA Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50SFA |
|---|---|
| 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 MFJ40X50-50SFA
| 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 MFJ40X50-50SFA Is Used
Changeover Dial-In
Fine-tune the extend position up to 50 mm during product format changes, using the 628.3 N push force to shift heavier tooling blocks into their final calibrated spot.
Prototype Stroke Setup
Perfect for trial-fit rigs where the exact extension is unknown, letting technicians shorten the stroke on the fly without machining external hard stops.
Variable Position Stops
Acts as an adjustable end-stop in material handling stations, using the FA flange to securely mount the cylinder while it pushes loads up to 377 N safely.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X50-50SFA the Right Cylinder?
When sizing these adjustable-stroke units, compare the two available bores directly: this 40 mm version pushes with 628.3 N at 0.5 MPa, whereas the smaller MFJ32 provides 402.2 N. Choose the 40 mm bore when moving heavier jigs or overcoming substantial friction, and rely on the 50 mm external adjuster to dial in the exact extend endpoint during trial fits or line changeovers without buying a new cylinder.
The included FA flange mount secures the body for face mounting, and the -S magnet enables electronic or reed sensing. Remember that the fixed TPU bumpers only decelerate the stroke end; they do not act as a brake. Because a standard cylinder drifts when air pressure drops, you must add an external rod lock or pilot-operated check valve to hold a suspended load safely.
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 MFJ40X50-50SFA FAQ
This 40 mm bore cylinder features a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 738.9 N pull at 0.7 MPa. Its theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 50 mm on site without changing the full retract length. The -S suffix indicates a built-in piston magnet for use with CMSG, DMSG, or EMSG switches, and fixed TPU bumper pads decelerate the stroke ends.
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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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