Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 300mm 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
- Stroke300 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM10×1.25
- 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 MFJ25X300-20S
Fine-tune your extend end position on-site with the AirTAC MFJ25X300-20S, 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 20 mm, giving a usable extend range of 280-300 mm without buying a new unit. The -S suffix equips the piston with a magnet for CMSG, DMSG or EMSG switches.
Delivering 245.3 N push and 206.1 N pull at 0.5 MPa, this double-acting actuator handles a safe working load of roughly 147 N. It lifts about 12.5 kg vertically with a 2:1 margin. The riveted construction yields a shorter mounting envelope than an ISO 6432 cylinder for the same 25 mm bore and 300 mm stroke, while fixed TPU bumper pads absorb end impacts. Air connects via a 1/8" port.
Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 300 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | 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 (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 MFJ Adjustable Mini Cylinder MFJ25X300-20S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×300 | 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 MFJ25X300-20S Is Used
Changeover Dial-In
Perfect for packaging line changeovers where the extend position needs a 20 mm tweak to accommodate different carton sizes without swapping the actuator.
Prototype Stroke Setup
Ideal for trial-fit rigs using the 245.3 N push force, allowing engineers to manually shorten the extend end from 300 mm down to 280 mm during initial machine commissioning.
Variable Position Stops
Replaces fixed external stops on light assembly presses, using the integrated adjuster to set the precise 280-300 mm extend endpoint for the 12.5 kg vertical lift capacity.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S the Right Cylinder?
When sizing these adjustable cylinders, compare the real thrust figures: the MFJ20 provides 157 N of push force at 0.5 MPa, while the larger MFJ32 delivers 402.2 N. This MFJ25 sits in the middle at 245.3 N, making it ideal for medium-duty trial fits where the exact end position is not final. The 20 mm adjuster window is perfect for line changeovers, letting you dial in the extend stop without adding external physical stops.
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 for a held load you must add an external rod lock or pilot-operated check valve. For mounting, choose LB foot, FA flange or TC trunnion brackets (SDB is unavailable). The built-in magnet enables position sensing with CMSG, DMSG or EMSG switches.
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 MFJ25X300-20S FAQ
This 25 mm bore cylinder has a 1/8" air port and a 10 mm rod with an M10x1.25 male thread. At 0.5 MPa it pushes with 245.3 N and pulls with 206.1 N. At 0.7 MPa the push is 343.4 N and pull is 288.5 N. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on-site, giving a usable extend range of 280-300 mm; the retract stroke remains full. It uses fixed TPU bumper pads to decelerate the piston at the stroke end, not an adjustable air cushion. The -S magnet allows CMSG, DMSG or EMSG sensors to detect position.
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.
Request a Quote for Airtac MFJ Adjustable Mini Cylinder MFJ25X300-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.