Airtac MFJ Adjustable Mini Cylinder MFJ40X150-20S
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ40X150-20S is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø40mm bore and 150mm 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
- Stroke150 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 MFJ40X150-20S
Trimming the extend end by up to 20 mm on site, this double-acting JIS-standard round-body mini cylinder lets you set a precise 130-150 mm working stroke without buying a new unit. The SUS304 stainless barrel and riveted aluminium covers yield a body that is shorter than an ISO 6432 cylinder for the same 40 mm bore, saving valuable mounting length while resisting mild washdown.
Delivering 628.3 N of push force at 0.5 MPa, it carries a safe working load of roughly 377 N or lifts about 32 kg vertically with a 2:1 margin. The -S suffix adds a piston magnet for CMSG, DMSG, or EMSG switches, and the 1/4" port feeds a 16 mm rod with an M14x1.5 male thread.
Airtac MFJ Adjustable Mini Cylinder MFJ40X150-20S Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ40X150-20S |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 150 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 MFJ40X150-20S
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×150 | 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 MFJ40X150-20S Is Used
Changeover Stations
Dial in the extend position within the 20 mm window during format changes, using the 628.3 N push force to shift heavy tooling blocks without remachining hard stops.
Trial-Fit Rigs
Perfect for prototype assembly lines where the exact 130-150 mm extend point is unknown, letting operators fine-tune the stroke on the fly before finalizing the layout.
Variable-Position Stops
Acts as an adjustable end stop for mid-process checking, pushing parts with up to 377 N of safe working load while the SUS304 barrel handles mild splash coolant.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ40X150-20S the Right Cylinder?
When sizing between the two bores, the MFJ32 provides 402.2 N of push at 0.5 MPa, whereas this MFJ40 steps up to 628.3 N, making the 40 mm bore the right pick when your trial-fit rig or changeover station needs to shift heavier fixtures. The external adjuster is ideal for commissioning lines where the exact end position is not yet final, as you can shorten the extend stroke within the 20 mm window instead of machining external stops.
Mounting options include LB foot, FA flange, and TC trunnion brackets, with no SDB or back-cover option on this adjustable build. Remember that the fixed TPU bumper pads only decelerate the stroke end; the cylinder will drift and drop its load on air loss, so fit an external rod lock or pilot check valve if you need to hold position.
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 MFJ40X150-20S FAQ
This 40 mm bore cylinder features a 1/4" port, a 16 mm rod, and an M14x1.5 male thread. 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 of 128.1 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 20 mm on site, giving a usable 130-150 mm extend, while the retract remains full. The -S suffix means a piston magnet is built in for CMSG, DMSG, or EMSG sensors, and fixed TPU bumper pads decelerate the stroke ends.
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 MFJ40X150-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.