Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-10S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-10S 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 MFCJ40X250-10S
Trim the extend stroke by up to 10 mm on site with the MFCJ40X250-10S, a JIS-standard round-body mini cylinder built for high-speed changeovers. A needle-set variable air cushion at both ends soaks up end-of-stroke shock.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild washdown, while the body is intentionally shorter than an ISO 6432 unit for the same 40 mm bore and 250 mm stroke. Delivering 628.3 N of push force at 0.5 MPa, it yields a safe working load of about 377 N. The -S magnet enables CMSG, DMSG, or EMSG sensors, and the 1/4" port matches the 16 mm rod.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-10S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-10S |
|---|---|
| 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 MFCJ40X250-10S
| 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 MFCJ40X250-10S Is Used
High-Speed Machining Clamps
Tune the 10 mm extend window to dial in exact clamping depth on repetitive machining lines, relying on the variable air cushion to halt the 628.3 N push force smoothly.
Package Diverters
Absorb the impact of fast diverting arms at 800 mm/s; the needle cushion prevents end-cap banging while the -S magnet confirms stroke position via DMSG sensors.
Pallet Stopper Gates
Halt heavier pallets using the 40 mm bore's robust thrust, adjusting the stroke on-site to match pallet tolerances without re-engineering the station.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X250-10S the Right Cylinder?
When sizing these adjustable-stroke units, compare both bores directly: this MFCJ40 provides 628.3 N push at 0.5 MPa, whereas the smaller MFCJ32 delivers 402.2 N. Choose the 40 mm bore when moving heavier fixtures, keeping in mind the vertical lift capacity is about 32 kg with a 2:1 safety margin.
The external adjuster lets you fine-tune the extend end position for trial fits without swapping cylinders, and the dual air cushions handle fast 30-800 mm/s speeds. Note that the cushion only decelerates the load; it does not hold position on air loss—add an external rod lock or pilot check valve if drift is unacceptable. Mount via LB foot, FA flange, or TC trunnion (no SDB).
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 MFCJ40X250-10S FAQ
This 40 mm bore cylinder features a 1/4" port and a 16 mm rod. 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 10 mm (usable extend 240-250 mm), while the variable air cushion at both ends decelerates the piston near the ends. The -S suffix means it has a built-in magnet for CMSG, DMSG, or EMSG 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 MFCJ40X250-10S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.