Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-100S
The AirTAC Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-100S is a genuine double acting, adjustable stroke + cushion JIS-standard round-body mini air cylinder with a Ø20mm bore and 125mm 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
- Stroke125 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 MFCJ20X125-100S
Dial in the exact extend length on-site with the AirTAC MFCJ20X125-100S, a double-acting JIS-standard round-body mini cylinder featuring a 100 mm adjustable window and needle-set variable air cushions at both ends. The external adjuster shortens the extend stroke from its 125 mm maximum down to 25 mm, while the cushions soak up high-speed end-of-stroke shock. An integrated piston magnet (-S) is included for position sensing.
Built with a SUS304 stainless steel barrel and riveted aluminium covers, this compact body is shorter than an ISO 6432 cylinder for the same envelope, resisting mild corrosion and washdown. The 20 mm bore uses a 1/8" port and an Ø8 mm rod with an M8x1.25 male thread. Generating 157 N of push force at 0.5 MPa, it yields a safe working load of roughly 94 N, lifting about 8 kg vertically with a 2:1 margin.
Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-100S Technical Specifications
| Model | Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-100S |
|---|---|
| Series | MFCJ JIS mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MFCJ20X125-100S
| MFCJ | JIS-standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | 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 MFCJ20X125-100S Is Used
Lightweight Trial Fits
Ideal for 8 kg vertical press-fits where the exact 25-125 mm extend point must be dialed in on the fly during tooling changeovers.
High-Speed Diverting
Handles rapid package diverting at up to 800 mm/s, using the variable air cushion to softly decelerate the 157 N thrust without slamming.
Lab Automation Stops
Perfect for compact lab testers needing a washdown-resistant SUS304 body and a 100 mm adjustable stroke window to fine-tune specimen contact depth.
Is the Airtac MFCJ Adjustable Mini Cylinder MFCJ20X125-100S the Right Cylinder?
When sizing this series, compare the bores directly: this 20 mm bore provides 157 N push at 0.5 MPa, whereas stepping up to the MFCJ25 yields 245.3 N. Choose the 20 mm bore for lighter, high-speed changeovers where both the stroke endpoint and end-of-stroke shock need on-site tuning. The variable air cushion only decelerates the piston near the end of travel; it is not a brake. If the machine loses air, the piston drifts, so fit an external rod lock or pilot check valve to hold a suspended load.
Mounting options include LB foot, FA flange, and TC trunnion (no SDB or back-cover mount). Because this SKU includes the -S magnet, you can directly mount CMSG, DMSG, or EMSG reed and electronic switches for end-position feedback.
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 MFCJ20X125-100S FAQ
This 20 mm bore cylinder features a 1/8" air port and an M8x1.25 male rod thread. It generates 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 100 mm (usable range 25-125 mm), while the needle variable air cushion at both ends decelerates the piston near stroke end. This -S model includes a piston magnet for CMSG/DMSG/EMSG sensors. The cushion is not a lock; use a pilot check valve for load holding.
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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