Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke300 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- 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 MFCJ20X300-40S
Tune extend travel precisely on-site with the AirTAC MFCJ20X300-40S, a JIS-standard round-body mini cylinder built from SUS304 stainless steel and riveted aluminium covers. The external adjuster shortens the nominal 300 mm extend stroke by up to 40 mm, yielding a usable 260-300 mm window, while the needle variable air cushion at both ends soaks up high-speed end-of-stroke shock. Retract travel remains full length.
Delivering 157 N push and 131.9 N pull at 0.5 MPa via a 1/8" port, this double-acting unit handles a safe working load of roughly 94 N or lifts about 8 kg vertically with a 2:1 margin. The -S suffix denotes a built-in piston magnet for CMSG, DMSG or EMSG switches. Its riveted round-body build is shorter than an ISO 6432 cylinder for the same bore and stroke, saving valuable mounting length.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 300 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MFCJ20X300-40S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | 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 MFCJ Adjustable Mini Cylinder MFCJ20X300-40S Is Used
Sorter Diverter Tuning
Dial in the exact 260-300 mm extend reach on a high-speed parcel diverter, using the 40 mm window to perfect the push angle while the variable air cushion silently absorbs the rapid stop.
Light Assembly Press
Drive a 94 N safe working load press for delicate component seating, adjusting the extend end-point on the fly during changeovers without swapping the cylinder.
Vertical Package Stop
Act as an adjustable height stop for 8 kg cartons on an elevator, relying on the needle cushion to prevent harsh impacts at 800 mm/s operating speeds.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X300-40S the Right Cylinder?
When sizing this series, compare the bores directly: this 20 mm bore yields 157 N push at 0.5 MPa, whereas the larger MFCJ25 provides 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where exact positioning and end-deceleration need field tuning. The 40 mm adjustable window is ideal for trial fits where the exact extend endpoint is unknown.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover). Because the -S magnet is present, you can directly fit CMSG, DMSG or EMSG sensors. Remember that the air cushion only decelerates the piston near stroke end—it is not a brake; if air loss occurs, the piston drifts, so add an external rod lock or pilot check valve to hold a suspended load.
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 MFCJ20X300-40S FAQ
This 20 mm bore cylinder features a 1/8" port and an 8 mm rod with an M8x1.25 male thread. It delivers 157 N push and 131.9 N pull at 0.5 MPa, 219.8 N push and 184.7 N pull at 0.7 MPa, with a theoretical maximum force of 32 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 40 mm on-site, giving a 260-300 mm usable window; retract remains full. The variable air cushion at both ends decelerates the piston near the end of travel for smooth stops, but it is not a lock—the piston will drift on air loss. The built-in -S magnet supports CMSG, DMSG and 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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