Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 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 MFJ40X20-10S
Fine-tune your extend end on-site with the AirTAC MFJ40X20-10S, a JIS-standard round-body mini cylinder featuring a 10 mm external stroke adjuster. This double-acting actuator uses a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter overall mounting length than an equivalent ISO 6432 unit while resisting mild washdown corrosion. The integrated -S piston magnet supports CMSG, DMSG, and EMSG switches for position sensing.
Delivering 628.3 N of push force at 0.5 MPa (and 879.6 N at 0.7 MPa) through its 1/4" port, this 40 mm bore model provides a safe working load of roughly 377 N. That translates to lifting about 32 kg vertically with a 2:1 safety margin. The external adjuster lets you shorten the extend stroke from its 20 mm nominal maximum down to 10 mm, which is perfect for trial fits and line changeovers where the exact end position is not final.
Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 MFJ40X20-10S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MFJ40X20-10S Is Used
Changeover Stations
Dial in the 10 mm extend window during product changeovers to set new end positions rapidly without swapping out the entire actuator.
Trial Fit Rigs
Leverage the 628.3 N push force to press test components, adjusting the stroke externally to find the exact 10 to 20 mm fit before finalizing the design.
Variable-Position Stops
Use the built-in magnet and external adjuster to create precise, sensor-confirmed variable stops for light pressing tasks up to 32 kg vertical lift.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X20-10S the Right Cylinder?
When sizing this series, you choose between the MFJ32 and the MFJ40. The MFJ32 yields 402.2 N of push at 0.5 MPa, whereas this MFJ40 delivers a stronger 628.3 N. Pick the 40 mm bore if your application needs to lift around 32 kg vertically with a 2:1 margin, or step down to the 32 mm bore for lighter duty. Both options use a 1/4" air port.
The adjustable stroke is invaluable during commissioning, allowing you to dial in the extend position by up to 10 mm without buying a new cylinder or adding external stops. Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the load. If you need to hold a vertical load on air loss, install an external rod lock or pilot check valve. For mounting, choose LB foot, FA flange, or TC trunnion brackets (SDB is unavailable).
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 MFJ40X20-10S FAQ
This 40 mm bore cylinder has a 1/4" air port and a male M14x1.5 rod thread. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, increasing to 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.
The external adjuster shortens the extend stroke by up to 10 mm on-site, giving a usable extend range of 10 to 20 mm; the retract stroke remains full. The fixed TPU bumper pads only decelerate the end of travel and do not act as a lock. The cylinder will drift on air loss, so use an external rod lock for load holding.
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 MFJ40X20-10S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.