Airtac MTF Mini Cylinder MTF40X20CM
The AirTAC Airtac MTF Mini Cylinder MTF40X20CM is a genuine single acting, pull (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port size1/4"
- Acting typeSingle acting, pull (spring return)
- Rod threadM14×1.5
- CushionFixed TPU bumper pads
About the Airtac MTF Mini Cylinder MTF40X20CM
Delivering 434.8 N of pull force at 0.5 MPa, this AirTAC MTF40X20CM is a JIS-standard round-body mini cylinder built for single-acting pull operation. The internal spring actively pushes the rod out, while applying air to the 1/4 inch port retracts it. Because the spring holds the rod extended at rest, the cylinder fails safely to the open position on air loss. The SUS304 stainless barrel and riveted aluminium covers resist mild corrosion and washdown environments.
For the same 40 mm bore and 20 mm stroke, this riveted construction is shorter than an ISO 6432 cylinder, saving valuable mounting length. It uses fixed TPU bumper pads for end-of-stroke deceleration rather than an adjustable cushion. This specific SKU lacks the -S magnet, meaning it cannot host CMSG, DMSG, or EMSG sensors. Factoring a 2:1 safety margin, the 434.8 N pull translates to an effective vertical lift capacity of about 22.2 kg.
Airtac MTF Mini Cylinder MTF40X20CM Technical Specifications
| Model | Airtac MTF Mini Cylinder MTF40X20CM |
|---|---|
| Series | MTF JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 mm |
| Acting type | Single acting, pull (spring return) |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 150 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 | Pull force (spring return) |
|---|---|
| 0.5 MPa | 434.8 N |
| 0.7 MPa | 645.8 N |
Single-acting pull: the spring extends the rod; air retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MTF Mini Cylinder MTF40X20CM
| MTF | JIS-standard round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 MTF Mini Cylinder MTF40X20CM Is Used
Spring-Return Valve Actuation
Uses the 434.8 N pull to pneumatically close a heavy valve, with the internal spring automatically forcing it back open if the air supply drops.
Tensioning Mechanisms
Maintains constant outward tension on belts or cables via the extended spring, using the 20 mm stroke to pull back and release the load when pressurized.
Fail-Safe Gate Retraction
Holds a safety guard open under spring pressure; applying air retracts the 16 mm rod to allow the gate to close securely during machine cycles.
Is the Airtac MTF Mini Cylinder MTF40X20CM the Right Cylinder?
When sizing this 40 mm bore, compare it directly against the MTF32, which provides 266.8 N of pull at 0.5 MPa. Since 40 mm is the largest bore in the MTF family, you would need to switch to a double-acting MF cylinder if even higher forces are required. The MTF40X20CM fits perfectly when your mechanism requires spring-open, air-close behavior or a reliable return-to-extended fail-safe. Remember that operating pressure must be at least 0.2 MPa to overcome the internal spring. The CM round-end back cover suits direct pivot mounting, and you can utilize LB foot, FA flange, SDB pivot-block, or TC trunnion brackets. If position feedback is needed, select the -S magnet version instead, as this base model cannot accept a switch.
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 0.2 – 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 MTF Mini Cylinder MTF40X20CM FAQ
This single-acting pull cylinder generates 434.8 N of pull force at 0.5 MPa and 645.8 N at 0.7 MPa. It requires a minimum operating pressure of 0.2 MPa to overcome the return spring, with a maximum pressure of 1.0 MPa.
No, this specific SKU does not include a magnet. You must order the -S variant to use CMSG, DMSG, or EMSG sensors. Additionally, the spring extends the rod at rest, so it fails to the extended position rather than holding a mid-stroke load.
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