Airtac MFJ Adjustable Mini Cylinder MFJ40X100-20
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X100-20 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 100mm 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
- Stroke100 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 MFJ40X100-20
Trimming the extend end by up to 20 mm on site, the MFJ40X100-20 lets you dial in the final position without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder uses a SUS304 stainless barrel and riveted aluminium covers, measuring shorter than an ISO 6432 unit for the same 40 mm bore and 100 mm stroke to save mounting length. A 1/4" port and M14x1.5 male rod thread feed the 16 mm rod.
In the 40 mm bore class, this double-acting actuator generates 628.3 N of push force at 0.5 MPa, making it suited for moderate loads. For vertical lifts, it handles about 32 kg with a 2:1 safety margin. Note that this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ40X100-20 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X100-20 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 100 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 MFJ40X100-20
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×100 | 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 MFJ40X100-20 Is Used
Changeover Stations
Fine-tune the extend stroke by up to 20 mm during product family changeovers, using the 628.3 N thrust to push varying part sizes without swapping hardware.
Trial Fit Rigs
Dial in the exact end position on prototype assembly rigs, relying on the 1/4" port and 16 mm rod to test positioning before finalizing the layout.
Variable Position Stops
Adjust the extend end on the fly for variable-position stops, letting the fixed TPU bumpers absorb the impact while you set the optimal travel distance.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X100-20 the Right Cylinder?
When sizing between the two available bores, the MFJ32 provides 402.2 N of push at 0.5 MPa, while this MFJ40 steps up to 628.3 N, giving you extra thrust for heavier tooling. The external adjuster is ideal for trial fits and line changeovers where the exact 80 to 100 mm extend position is not yet final. Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Remember that the fixed TPU bumper pads only decelerate the stroke end; they do not lock the piston. If you need to hold a load on air loss, install 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 MFJ Adjustable Mini Cylinder MFJ40X100-20 FAQ
This 40 mm bore cylinder has a 1/4" port and a 16 mm rod. 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.
An external adjuster shortens the extend stroke by up to 20 mm on site without changing the base cylinder. This SKU lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG sensors. Fixed TPU bumpers decelerate the stroke ends but do not function as an adjustable air cushion.
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 MFJ40X100-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.