Airtac MFJ Adjustable Mini Cylinder MFJ40X250-30S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X250-30S 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 MFJ40X250-30S
Trimming the extend end by up to 30 mm on-site, the AirTAC MFJ40X250-30S lets you set a precise 220 to 250 mm forward travel without swapping hardware. This double-acting JIS-standard round-body mini cylinder pairs a SUS304 stainless steel barrel with riveted aluminium covers, yielding a shorter envelope than an ISO 6432 unit for the same 40 mm bore and 250 mm stroke.
The 16 mm rod (M14x1.5 male thread) transmits 628.3 N push and 527.8 N pull at 0.5 MPa through a 1/4" port. Because the -S suffix includes a piston magnet, you can mount CMSG, DMSG or EMSG switches for position sensing. Fixed TPU bumpers absorb end-impact across the 30-800 mm/s speed range.
Airtac MFJ Adjustable Mini Cylinder MFJ40X250-30S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X250-30S |
|---|---|
| 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 MFJ40X250-30S
| 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 MFJ40X250-30S Is Used
Changeover Stations
Dial in the 220-250 mm extend position during product format changes without machining new hard stops, leveraging 628.3 N of push force.
Trial Fit Rigs
Perfect for prototype assembly stations where the exact extend endpoint must be dialed in physically before finalising the 250 mm stroke specification.
Variable Position Stops
Provide adjustable physical end-stops for pressing or locating tasks, safely handling a safe working load of roughly 377 N.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X250-30S the Right Cylinder?
Choose the MFJ40 over the MFJ32 when you need heavy thrust: the 40 mm bore delivers 628.3 N push at 0.5 MPa versus 402.2 N for the 32 mm bore. Here, the 30 mm adjustable window is ideal for trial fits or line changeovers where the exact 250 mm extend position is not yet finalised. The external adjuster only shortens the forward stroke; full retract remains unchanged.
Remember that fixed bumpers decelerate the stroke but do not lock the rod. If gravity or air loss could cause drift, fit an external rod lock or pilot check valve. For mounting, use LB foot, FA flange or TC trunnion brackets (SDB is unavailable). The built-in magnet (-S) supports CMSG/DMSG/EMSG sensors.
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 MFJ40X250-30S FAQ
This 40 mm bore cylinder uses a 1/4" port and a 16 mm rod. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa it pushes 879.6 N and pulls 738.9 N. The theoretical maximum force is 128.1 kgf at 1.0 MPa.
An external adjuster shortens the extend stroke by up to 30 mm on-site, giving a usable 220-250 mm forward travel. The cylinder uses fixed TPU bumper pads to decelerate the stroke end, not an adjustable air cushion. The -S suffix means it has a magnet for CMSG/DMSG/EMSG sensors.
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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.
Fast Reply
Most inquiries answered within 7-8 hours.
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