Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-40S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 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 MFCJ40X80-40S
Tune both the extend end-point and the end-of-stroke shock on site with this 40 mm bore, 80 mm base stroke cylinder. The external adjuster shortens the extend stroke by up to 40 mm, while needle variable air cushions at both ends soak up high-speed impact. A 1/4" port and M14x1.5 male rod thread equip this JIS-standard round-body mini for demanding cycles.
The SUS304 stainless steel barrel and riveted aluminium covers resist mild corrosion and washdown. Because the MF body is shorter than an ISO 6432 cylinder for the same bore and stroke, it saves mounting length. The built-in -S magnet supports CMSG, DMSG, and EMSG switches. Delivering 628.3 N of push force at 0.5 MPa, it yields a safe working load of about 377 N, lifting roughly 32 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFCJ40X80-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MFCJ40X80-40S Is Used
Machine Tool Clamping
Dial in the exact clamping reach within the 40 mm window and rely on the variable air cushion to soften the 628.3 N impact during rapid automated machining cycles.
High-Speed Diverting
Adjust the diverting stroke on site for mixed product sizes; the CMSG sensors detect the position while the needle cushion absorbs the high-speed stop.
Vertical Lift Stops
Lift loads up to about 32 kg with a 2:1 safety margin, using the external adjuster to set precise upper end positions without re-mounting the cylinder.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ40X80-40S the Right Cylinder?
When sizing these adjustable-stroke units, compare the real thrust: this MFCJ40 pushes 628.3 N at 0.5 MPa, whereas the smaller MFCJ32 delivers 402.2 N. Choose the 40 mm bore when moving heavier fixtures, then dial in the exact 40 to 80 mm extend position on the fly. The variable air cushion is ideal for high-speed changeovers and shock-sensitive trial fits.
Note that the air cushion only decelerates the piston near the stroke end; it does not lock or hold the load. If air pressure drops, the piston drifts, so install an external rod lock or pilot check valve for suspended loads. Mount using LB foot, FA flange, or TC trunnion brackets (no SDB). The -S magnet enables 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 MFCJ40X80-40S FAQ
This double-acting cylinder has a 40 mm bore, 1/4" port, and M14x1.5 male rod thread. It pushes 628.3 N and pulls 527.8 N at 0.5 MPa, and pushes 879.6 N and pulls 738.9 N at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa, with an operating speed of 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 40 mm on site, giving a usable extend range of 40-80 mm; retract remains full. Needle variable air cushions at both ends decelerate the piston to reduce shock. The -S magnet allows CMSG, DMSG, or EMSG switches to be fitted.
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 MFCJ40X80-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.