Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø25mm bore and 70mm stroke, 1/8" 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.
- BoreØ25 mm
- Stroke70 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM10×1.25
- CushionVariable air cushion, both ends
- 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 MFCJ Adjustable Mini Cylinder MFCJ25X70-40S
Dial in exact extend distances on-site with the AirTAC MFCJ25X70-40S, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. An external adjuster shortens the extend stroke by up to 40 mm (usable range 30-70 mm), while needle variable air cushions at both ends absorb high-speed end-of-stroke shock. Because the MF body is shorter than an ISO 6432 cylinder for the same bore and stroke, it saves valuable mounting length without conforming to that standard.
Fitted with a 1/8" port and a 10 mm rod (M10x1.25 thread), this double-acting actuator delivers 245.3 N of push force at 0.5 MPa. The built-in -S magnet supports CMSG, DMSG and EMSG position switches. For sizing, its safe working load is roughly 147 N, meaning it lifts about 12.5 kg vertically with a 2:1 margin. Note that the cushion only decelerates the piston; use an external rod lock or pilot check valve if you need to hold a load on air loss.
Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 70 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 | Variable air cushion, both ends |
| 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×70 | 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 MFCJ Adjustable Mini Cylinder MFCJ25X70-40S Is Used
High-Speed Component Pressing
Tune the 40 mm extend window to set precise contact depth, while the variable air cushion decelerates the 245.3 N thrust to prevent impact damage on delicate electronic fittings.
Adjustable Transfer Diverter
Reconfigure the extend end-position on the fly for different package sizes. The SUS304 stainless barrel handles mild washdowns in packaging lines.
Lab Automation Trial Fits
Ideal for test rigs needing exact 30-70 mm extend lengths. The compact JIS body saves space, and the needle cushion softens high-speed 800 mm/s cycles.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ25X70-40S the Right Cylinder?
Choose this 25 mm bore when you need 245.3 N push at 0.5 MPa with on-the-fly stroke tuning. If your changeover requires less force, the MFCJ20 provides 157 N; if you need heavier thrust, the MFCJ32 offers 402.2 N. This model shines in high-speed changeovers where both the 40 mm extend window and the dual variable air cushions need independent tweaking to prevent shock damage during trial fits.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover code). The -S magnet enables CMSG/DMSG/EMSG sensors; a SKU without S cannot take a switch. Remember that the adjuster sets the end position and the cushion only decelerates, so neither acts as a mid-stroke lock or brake.
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 MFCJ Adjustable Mini Cylinder MFCJ25X70-40S FAQ
This double-acting cylinder has a 1/8" port and a 10 mm rod. It generates 245.3 N push and 206.1 N pull at 0.5 MPa, or 343.4 N push and 288.5 N pull at 0.7 MPa. The theoretical max force is 50 kgf at 1.0 MPa. Operating speed ranges from 30-800 mm/s.
The external adjuster shortens the extend stroke by up to 40 mm (usable 30-70 mm). The variable air cushion at both ends uses a needle valve to decelerate the piston near stroke end. It is not a lock or brake; the piston will drift on air loss. For load holding, install an external rod lock or pilot check valve. The -S magnet supports CMSG/DMSG/EMSG 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.
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