Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100 is a genuine double acting, adjustable stroke 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, 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 MFJ40X250-100
Dial in your extend end-position on-site with the AirTAC MFJ40X250-100, a JIS-standard round-body mini cylinder featuring a 100 mm adjustable stroke window. The external adjuster lets you shorten the extend travel from its 250 mm nominal length down to 150 mm without swapping hardware or adding external stops, making it highly effective for trial fits and line changeovers where the exact end point is not yet final. Retract travel remains full length.
Built with a SUS304 stainless steel barrel and riveted aluminium covers, this double-acting unit delivers 628.3 N of push force at 0.5 MPa. The compact riveted body is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length while resisting mild corrosion and washdown. It uses a 1/4" port and a 16 mm rod with an M14x1.5 male thread. Based on the 0.5 MPa push figure, it handles a safe working load of about 377 N, lifting roughly 32 kg vertically with a 2:1 safety margin.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MFJ40X250-100
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MFJ Adjustable Mini Cylinder MFJ40X250-100 Is Used
Changeover Stations
Fine-tune the 150 to 250 mm extend position on the fly during product changeovers, eliminating the need to physically swap cylinders for different part lengths.
Trial Fit Rigs
Leverage the 628.3 N push force to securely seat components while operators determine the exact final stroke dimension before finalizing a machine design.
Variable Position Stops
Use the 100 mm external adjuster to set precise end-stops for pressing or locating tasks, adapting the 40 mm bore output to varying material thicknesses.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-100 the Right Cylinder?
When sizing between the two available bores, the MFJ40 offers 628.3 N push at 0.5 MPa compared to the MFJ32 at 402.2 N, making this 40 mm bore the right pick when your load approaches 38 kg. The 100 mm adjustment window is exceptionally wide, allowing you to fine-tune the extend stroke anywhere from 150 to 250 mm during commissioning. Mounting options include LB foot, FA flange, and TC trunnion (no SDB). Note that this plain SKU lacks a magnet and cannot accept CMSG, DMSG, or EMSG sensors; you must specify the -S variant for position detection. Fixed TPU bumpers decelerate the stroke ends, but the cylinder will drift on air loss, so add an external rod lock or pilot check valve for held loads.
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 MFJ40X250-100 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 force of 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 100 mm on-site, giving a usable extend range of 150 to 250 mm; retract remains full. The cylinder uses fixed TPU bumper pads to decelerate the stroke ends and is not equipped with an adjustable air cushion. This SKU has no magnet, so it cannot take a sensor.
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 MFJ40X250-100
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.