Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- CushionVariable 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 MFCJ Adjustable Mini Cylinder MFCJ40X250-50
Tune your extend end-position by up to 50 mm on-site with this adjustable-stroke variable-cushion mini cylinder. It is a JIS-standard round-body unit built with a SUS304 stainless barrel and riveted aluminium covers, delivering a robust 628.3 N push force at 0.5 MPa through its 1/4" port.
The external adjuster shortens the extend stroke within a 200-250 mm usable window, while the needle air cushion at both ends soaks up high-speed shock. This body is shorter than an ISO 6432 cylinder for the same bore and stroke, saving mounting length. It provides a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| 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 | Variable air cushion, both ends |
| 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 MFCJ Adjustable Mini Cylinder MFCJ40X250-50
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MFCJ Adjustable Mini Cylinder MFCJ40X250-50 Is Used
High-Speed Diverters
Absorbs the impact of fast package routing using its variable air cushion while the 50 mm stroke adjuster dials in the exact pusher distance for various box sizes.
Machine Tool Changeovers
Handles heavy clamping or ejection tasks with 628.3 N of push force, allowing operators to fine-tune the extend position on-site during product line changeovers.
Carton Forming Arms
Provides the robust push needed to erect heavy cartons, with the needle cushion ensuring quiet, shock-free motion at cycle speeds up to 800 mm/s.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50 the Right Cylinder?
When sizing these two bores, the MFCJ40 provides 628.3 N of push force at 0.5 MPa compared to 402.2 N on the MFCJ32, making the 40 mm bore the right pick for heavier high-speed changeovers where end-of-stroke shock also needs tuning. Note that the air cushion only decelerates the piston near the end of travel; it is not a lock or brake, and the piston will drift on air loss. Use an external rod lock or pilot check valve if you must hold a load.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code). Because this specific SKU lacks the -S magnet, it cannot accept CMSG, DMSG, or EMSG sensors; choose the -S variant if you require position sensing.
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 MFCJ Adjustable Mini Cylinder MFCJ40X250-50 FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. It generates 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.
The external adjuster shortens the extend stroke by up to 50 mm within a 200-250 mm usable window, but it does not lock the position mid-stroke. A variable air cushion at both ends decelerates the piston near the ends of travel to reduce shock. This SKU has no magnet (-S) and cannot take 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.
Related AirTAC MFCJ Cylinders
Request a Quote for Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.