Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S 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
About the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S
Dial in your extend end-position on the factory floor with the AirTAC MFJ40X80-100S, a JIS-standard round-body mini cylinder built with a SUS304 stainless barrel and riveted aluminium covers. An external adjuster lets you shorten the extend stroke by up to 100 mm on-site, avoiding the need to buy a new cylinder or add external mechanical stops when the exact travel is not final. The -S suffix equips this unit with a piston magnet for CMSG, DMSG, or EMSG reed and electronic switches.
In the 40 mm bore class, this double-acting actuator delivers a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa, peaking at a theoretical 128.1 kgf at 1.0 MPa. For sizing, it yields a safe working load of roughly 377 N, lifting about 32 kg vertically with a 2:1 margin. The riveted body is shorter than an ISO 6432 cylinder of the same bore and stroke, saving valuable mounting length while resisting mild washdown. Air connects via a 1/4" port, and the Ø16 mm rod features an M14x1.5 male thread.
Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S |
|---|---|
| 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 MFJ40X80-100S
| 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 MFJ40X80-100S Is Used
Changeover Stations
Swap product formats rapidly by dialing the extend stroke down up to 100 mm on-site, using the 628.3 N push force to seat new parts without swapping cylinders.
Trial Fit Rigs
Perfect for engineering benches where the exact end position is unknown, letting technicians find the optimal 0-80 mm travel window before finalizing the machine design.
Variable Position Stops
Replace hard external stops with the integrated adjuster to fine-tune the end of extension, safely moving loads up to 377 N without disassembling the line.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X80-100S the Right Cylinder?
Choose between the two available bores based on your force requirements: the MFJ32 provides 402.2 N of push force at 0.5 MPa, whereas this MFJ40 steps up to 628.3 N. The 100 mm adjustable window is particularly useful for trial fits and line changeovers where the final end position is unknown during commissioning. Both sizes use fixed TPU bumper pads to decelerate the stroke end across the 30-800 mm/s speed range.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover). Remember that the external adjuster only sets the extend end position; it is not a mid-stroke lock. A plain cylinder drifts on air loss, so specify an external rod lock or pilot check valve if you must hold a load vertically. Because this SKU includes the -S magnet, it is fully ready for CMSG, DMSG, or EMSG sensors.
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 MFJ40X80-100S FAQ
This 40 mm bore cylinder has a 1/4" port and a 16 mm rod. At 0.5 MPa it pushes with 628.3 N and pulls with 527.8 N. At 0.7 MPa the push is 879.6 N and pull is 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 100 mm on-site, but it only sets the end position and does not act as a mid-stroke lock. End-of-travel deceleration is handled by fixed TPU bumper pads, not an adjustable air cushion. The -S suffix means it has a built-in magnet for CMSG, DMSG, or EMSG sensors.
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