Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 65mm 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
- Stroke65 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 MFJ40X65-20
Dial in your extend end-point on the fly with the AirTAC MFJ40X65-20, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the forward stroke by up to 20 mm directly at the fixture, giving a usable extend range of 45 to 65 mm without buying a new unit or adding external stops. Because the body is inherently shorter than a comparable ISO 6432 cylinder for this 40 mm bore and 65 mm stroke, it saves valuable mounting length in tight machinery.
This double-acting actuator delivers 628.3 N of push force at 0.5 MPa, translating to a safe working load of roughly 377 N or a vertical lift of about 32 kg with a 2:1 margin. It uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. Note that this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors. The fixed TPU bumper pads absorb end-of-stroke impact, but the piston will drift if air pressure is lost, so fit an external rod lock or pilot check valve if you need to hold a suspended load.
Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 65 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 MFJ40X65-20
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×65 | 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 MFJ40X65-20 Is Used
Changeover Stations
Fine-tune the 45 to 65 mm extend position during product format changes, utilising the 628.3 N push force to shift heavier tooling without adding external stops.
Trial Fit Rigs
Dial in the exact end-of-stroke contact point on prototype assemblies, using the 20 mm adjuster to test multiple positions before finalising the mechanical layout.
Variable-Position Stops
Act as an adjustable physical stop for incoming pallets or goods, leveraging the 527.8 N pull force and fixed TPU bumpers to absorb impact at the end of travel.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20 the Right Cylinder?
Choosing between the two available bores comes down to your force requirements. The MFJ40X65-20 provides 628.3 N push and 527.8 N pull at 0.5 MPa, making it well-suited for heavier positioning tasks. If your application is lighter, stepping down to the MFJ32 bore yields 402.2 N push at 0.5 MPa, which might be a better fit for compact assemblies.
The 20 mm adjustable window is ideal for trial fits and line changeovers where the exact end position is not yet finalised. For mounting, you can use LB foot, FA flange, or TC trunnion brackets (there is no SDB or back-cover option on this build). If you require position feedback, select the -S magnet variant to enable CMSG, DMSG, or EMSG switches.
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 MFJ40X65-20 FAQ
This 40 mm bore, 65 mm stroke cylinder uses a 1/4" port and a 16 mm rod with an M14x1.5 thread. It delivers 628.3 N push and 527.8 N pull at 0.5 MPa, and 879.6 N push and 738.9 N pull at 0.7 MPa. The theoretical maximum force is 128.1 kgf at 1.0 MPa. Operating pressure is 0.15-1.0 MPa, proof pressure is 1.5 MPa, and speed ranges from 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 20 mm on-site, giving a usable forward range of 45 to 65 mm; the retract stroke remains full. The cylinder has fixed TPU bumper pads to decelerate at the end of travel, not an adjustable air cushion. It does not hold position on air loss, so you must use an external rod lock or pilot check valve for suspended loads. This SKU has no -S magnet and cannot take 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.
Request a Quote for Airtac MFJ Adjustable Mini Cylinder MFJ40X65-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.