Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50 is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 300mm 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
- Stroke300 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 MFCJ40X300-50
Tune both travel and end-of-stroke shock precisely with this 40 mm bore adjustable-stroke cylinder. A 50 mm external adjuster window lets you shorten the extend stroke on site from a 300 mm maximum down to 250 mm, while the needle variable air cushion at both ends soaks up high-speed impact. It delivers 628.3 N of push force at 0.5 MPa through a 1/4 inch port.
Built as a JIS-standard round-body mini with a SUS304 stainless barrel and riveted aluminium covers, the body is deliberately shorter than an ISO 6432 cylinder of the same size, saving valuable mounting length. The SUS304 construction also resists mild corrosion and washdown. Based on the 0.5 MPa push rating, expect a safe working load around 377 N, lifting about 32 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50 Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50 |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 300 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 MFCJ40X300-50
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 MFCJ40X300-50 Is Used
High-Speed Carton Diverting
Uses the 50 mm adjuster to dial in the exact push distance for varying box sizes, while the air cushion absorbs the impact of fast 628.3 N extend strokes.
Adjustable Tooling Stops
Sets precise 250 to 300 mm end positions for machining fixtures, allowing quick changeovers on the fly without swapping the entire cylinder body.
Pallet Feed Positioning
Handles heavier pallets with a safe 377 N working load, relying on the variable cushion to prevent endcap damage during rapid 800 mm/s cycles.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X300-50 the Right Cylinder?
Choose the MFCJ40 over the MFCJ32 when you need heavier push capacity: the 40 mm bore yields 628.3 N at 0.5 MPa versus 402.2 N for the 32 mm. This makes the 40 mm ideal for moving larger fixtures, while the 32 mm suits lighter pick-and-place. Both share the 1/4 inch port and 30-800 mm/s speed range.
This SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG sensors; add the -S variant if you need position feedback. Mount via LB foot, FA flange or TC trunnion (no SDB). Note that the air cushion only decelerates the piston near stroke end and does not lock the load; for vertical or safety holding, fit an external rod lock or pilot check valve.
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 MFCJ40X300-50 FAQ
This 40 mm bore cylinder has a 1/4 inch port and a 16 mm rod. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
This specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG switches. The external adjuster shortens the extend stroke by up to 50 mm on site (usable range 250-300 mm), while the variable air cushion at both ends decelerates the piston near the ends to reduce shock.
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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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