Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75 is a genuine double acting, adjustable stroke 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
- 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 MFJ40X80-75
Trimming the extend end by up to 75 mm on site, this 40 mm bore adjustable mini cylinder removes the need to swap hardware when finalizing a stroke position. The riveted aluminium covers and SUS304 stainless steel barrel form a JIS-standard round body that is physically shorter than a comparable ISO 6432 unit, saving valuable mounting length. A 1/4" port and M14x1.5 male rod thread equip it for standard pneumatic plumbing.
Delivering 628.3 N of push force at 0.5 MPa (879.6 N at 0.7 MPa), it provides a safe working load of roughly 377 N or lifts about 32 kg vertically with a 2:1 margin. Fixed TPU bumper pads absorb end-of-stroke impact across the 30-800 mm/s speed range. Note this SKU lacks a magnet, so it cannot accept CMSG, DMSG or EMSG sensors without switching to the -S variant.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MFJ40X80-75
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MFJ Adjustable Mini Cylinder MFJ40X80-75 Is Used
Changeover Dialing
Dial in the exact extend position during product changeovers using the 75 mm adjuster, avoiding the cost of machining new hard stops.
Trial Fit Assembly
Safely press parts with 628.3 N of force while tweaking the end point on the fly to find the optimal assembly depth.
Prototype Positioning
Set variable end stops on test rigs where the required stroke length is still unknown, leveraging the 32 kg vertical lift capacity.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-75 the Right Cylinder?
When sizing these adjustable units, compare the two available bores directly: the 40 mm bore here yields 628.3 N push at 0.5 MPa, whereas the MFJ32 provides 402.2 N. Choose the 40 mm bore when moving heavier jigs or overcoming substantial friction. The 75 mm adjustment window is ideal for trial fits and line changeovers where the exact extend position is unknown until commissioning.
Mounting options include LB foot, FA flange and TC trunnion (there is no SDB or back-cover option). Because fixed bumpers only decelerate the piston and do not lock it, expect drift on air loss; install an external rod lock or pilot check valve if the load must be held. To add sensing, select the -S magnet version for switch compatibility.
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 MFJ40X80-75 FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, or 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 75 mm on site without changing the cylinder body. Fixed TPU bumper pads decelerate the piston at the end of travel; they are not an adjustable air cushion. This unit has no magnet, so it cannot support position 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 MFJ40X80-75
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.