Airtac MFJ Adjustable Mini Cylinder MFJ40X40-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X40-30S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 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 MFJ40X40-30S
Trim the extend stroke by up to 30 mm right at the machine with the AirTAC MFJ40X40-30S, a JIS-standard round-body mini cylinder built for on-site end-position tuning. The external adjuster lets you shorten the forward stroke within a 10 to 40 mm usable window without buying a new unit or adding external stops, while the retract stroke remains full. Driven by a 16 mm rod and a 1/4" port, this double-acting actuator delivers 628.3 N of push force at 0.5 MPa, making it a robust choice for moderate loads.
The riveted rolling-packed construction pairs a SUS304 stainless steel barrel with aluminium covers, yielding a body that is shorter than an ISO 6432 cylinder for the same bore and stroke to save mounting length. Because this SKU includes the -S magnet, it is ready for CMSG, DMSG, or EMSG reed or electronic switches. Fixed TPU bumper pads decelerate the stroke ends. For a safe working load, expect around 377 N (about 60% of the 0.5 MPa push force), or vertical lifts of about 32 kg with a 2:1 margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X40-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X40-30S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MFJ40X40-30S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MFJ40X40-30S Is Used
Changeover Stations
Dial in the 30 mm extend window during format changeovers to set new push positions without swapping the cylinder or adding mechanical stops.
Trial Fit Rigs
Leverage the 628.3 N push force and adjustable forward end to test part seating depths on prototype assemblies before finalizing the stroke.
Variable Position Stops
Use the -S magnet with DMSG sensors and the external adjuster to create precise, repeatable end positions that can be shortened on the fly.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X40-30S the Right Cylinder?
When sizing this adjustable actuator, compare both available bores using real 0.5 MPa figures: this MFJ40 pushes 628.3 N, while the smaller MFJ32 pushes 402.2 N. Choose the 40 mm bore when your trial fits or line changeovers demand higher thrust, and rely on the 30 mm adjustment window to fine-tune the extend end where the exact position is not yet final. Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover code). Remember that the bumper only decelerates the stroke end; a plain cylinder does not hold its load on air loss, so fit an external rod lock or pilot check valve if you need to prevent drift.
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 MFJ40X40-30S FAQ
This 40 mm bore double-acting cylinder uses a 1/4" port and a 16 mm rod. It generates 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push and 738.9 N pull at 0.7 MPa, with a theoretical maximum of 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 30 mm on-site, giving a usable 10 to 40 mm forward window, while the retract stroke remains full. The -S suffix means a piston magnet is built-in for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers decelerate the ends but do not lock the load.
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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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