Airtac MFJ Adjustable Mini Cylinder MFJ40X30-30
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X30-30 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 30mm 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
- Stroke30 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 MFJ40X30-30
Trimming the extend end by up to 30 mm on site, the AirTAC MFJ40X30-30 brings 628.3 N of push force at 0.5 MPa to applications where the final position is not yet locked in. This JIS-standard round-body mini cylinder uses a SUS304 stainless barrel with riveted aluminium covers, yielding a shorter overall envelope than an ISO 6432 unit of identical bore and stroke. The 1/4" port and M14x1.5 male rod thread handle the 40 mm bore's air and mounting demands.
Built as a double-acting actuator with fixed TPU bumper pads, it decelerates impacts at the stroke end without claiming to be an adjustable cushion variant. Because this specific SKU lacks the -S magnet option, it cannot host CMSG, DMSG, or EMSG sensors. Factoring a 2:1 safety margin, the 0.5 MPa push force lifts about 32 kg vertically, equating to a safe working load near 377 N.
Airtac MFJ Adjustable Mini Cylinder MFJ40X30-30 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X30-30 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 30 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 MFJ40X30-30
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×30 | 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 MFJ40X30-30 Is Used
Changeover Dial-In
Leverage the 30 mm extend adjuster to fine-tune the stopping point of a 628.3 N push force when switching between product families on a shared line.
Prototype Stroke Setup
Use the on-site adjuster during trial fits to find the exact extend position before finalizing a machine design, saving the cost of ordering a new cylinder.
Variable Position Stops
Shift the end-of-stroke impact point within the 30 mm window to gently decelerate a 32 kg vertical lift using the fixed TPU bumper pads.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X30-30 the Right Cylinder?
Choosing between the two available bores comes down to force: the MFJ40 delivers 628.3 N push and 527.8 N pull at 0.5 MPa, whereas the MFJ32 steps down to 402.2 N push and 345.6 N pull. Select this 40 mm bore when your trial-fit rig or changeover station needs that extra thrust margin to shift a jig. The 30 mm adjustable window lets you dial in the extend end perfectly during commissioning, avoiding the need to swap cylinders for a slightly different reach.
Mounting options include LB foot, FA flange, and TC trunnion (with no SDB or back-cover provision). Remember that the external adjuster sets the end position but does not function as a mid-stroke lock; the piston will drift if air pressure drops, so fit an external rod lock or pilot check valve to hold a suspended load.
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 MFJ40X30-30 FAQ
This 40 mm bore cylinder features a 1/4" port and generates 628.3 N push / 527.8 N pull at 0.5 MPa, and 879.6 N push / 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 30 mm on site without changing the cylinder body. This unit lacks the -S magnet, so it cannot accept CMSG, DMSG, or EMSG switches. It uses fixed TPU bumper pads rather than an adjustable air cushion.
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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.
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Most inquiries answered within 7-8 hours.
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