Airtac MFD Double Rod Miniature Cylinder MFD40X250S
The AirTAC Airtac MFD Double Rod Miniature Cylinder MFD40X250S is a genuine double acting, double rod JIS-standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 mm
- Port size1/4"
- Acting typeDouble acting, double rod
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MFD Double Rod Miniature Cylinder MFD40X250S
Twin rods exiting both covers define this double-acting mini cylinder, yielding equal thrust in both directions while actively resisting load rotation. As a JIS-standard round-body unit built with a SUS304 stainless barrel and riveted aluminium covers, it provides mild washdown resistance and occupies a shorter overall length than a comparable ISO 6432 cylinder. The 40 mm bore uses a 1/4" port and M14x1.5 male rod threads.
At 0.5 MPa it generates 527.8 N of force both ways, rising to 738.9 N at 0.7 MPa, with a theoretical maximum of 107.6 kgf at 1.0 MPa. Because the -S suffix equips the piston with a magnet, you can mount CMSG, DMSG or EMSG switches for position sensing. The fixed TPU bumper pads decelerate the stroke ends, but note that the cylinder drifts on air loss—an external rod lock is required to hold a load safely. For a safe working load, expect around 317 N, or a vertical lift of about 26.9 kg with a 2:1 margin.
Airtac MFD Double Rod Miniature Cylinder MFD40X250S Technical Specifications
| Model | Airtac MFD Double Rod Miniature Cylinder MFD40X250S |
|---|---|
| Series | MFD JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, double rod |
| 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 300 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
Double-rod: a rod exits both covers, so output force is equal in both directions (rod-side area used).
Model Code: Airtac MFD Double Rod Miniature Cylinder MFD40X250S
| MFD | JIS-standard round-body mini cylinder (double-rod). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MFD Double Rod Miniature Cylinder MFD40X250S Is Used
Anti-Rotation Transfer Slide
Moves a 25 kg machining fixture horizontally over 250 mm. The twin 16 mm rods prevent the load from twisting during transit, utilising the 527.8 N available at 0.5 MPa.
Twin-Tool Actuator
Drives a double-ended pick-and-place mechanism where both rods carry tooling. Equal force in both directions ensures consistent clamping and release without requiring a larger bore.
Rear-Rod Switch Trip
Uses the extended back rod to physically trip a limit switch while the main rod shifts a 317 N payload. The -S magnet also allows DMSG sensors to confirm mid-stroke positions.
Is the Airtac MFD Double Rod Miniature Cylinder MFD40X250S the Right Cylinder?
When sizing this series, compare the 40 mm bore against the MFD32, which provides 345.6 N at 0.5 MPa. Choose the MFD40X250S when your application demands the higher 527.8 N double-rod thrust to shift heavier jigs. The twin-rod architecture is essential for anti-rotation slides or twin-tool actuation where a single rod would twist under offset loads. The rear protruding rod also offers a convenient mounting point for stoppers or secondary sensors.
Mounting options include LB foot, FA flange, and TC trunnion brackets; there is no SDB or back-cover code because a rod exits both ends. The built-in magnet (-S) supports CMSG, DMSG, and EMSG switches for precise end-of-stroke detection. Remember that fixed TPU bumpers only decelerate the impact at stroke end and will not brake the piston if air pressure drops.
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 MFD Double Rod Miniature Cylinder MFD40X250S FAQ
It delivers equal force in both directions: 527.8 N at 0.5 MPa, 738.9 N at 0.7 MPa, and a theoretical max of 107.6 kgf at 1.0 MPa. The 40 mm bore features a 1/4" air port and M14x1.5 male rod threads on both ends.
The twin rods resist rotation and provide equal thrust both ways using the rod-side area. The -S suffix means a magnet is built-in for CMSG, DMSG, or EMSG switches. Fixed TPU bumpers decelerate the stroke ends, but an external rod lock is needed to hold position on air loss.
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