Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU
The AirTAC Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU is a genuine double acting + cushion standard round-body mini air cylinder with a Ø40mm bore and 390mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service. A variable air cushion at both ends lets you tune end-of-stroke deceleration on site.
- BoreØ40 mm
- Stroke390 mm
- Port size1/8"
- Acting typeDouble acting + cushion
- Rod threadM12×1.25
- CushionVariable air cushion, both ends
About the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU
Over 390 mm of travel, this 40 mm bore MAC cylinder keeps the same 628.3 N push at 0.5 MPa (879.6 N at 0.7 MPa) from start to finish, with a variable air cushion at both ends bringing the rod home without a bang. Double acting throughout, it suits sliding doors, feeders and long indexing moves at 30 to 800 mm/s.
The 16 mm hard-chrome rod on a stainless rolled barrel resists corrosion in humid plants, but a stroke this long asks for good alignment: keep side loads low or guide the load externally so the rod does not bend. The magnet comes fitted as standard for CMSG, DMSG and EMSG switches, and once a working reserve is kept you have roughly 377 N of usable push at 0.5 MPa.
Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU Technical Specifications
| Model | Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU |
|---|---|
| Series | MAC mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 390 mm |
| Acting type | Double acting + cushion |
| Port size | 1/8" |
| Rod thread | M12×1.25 |
| 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 MA-series datasheet. Barrel: stainless-steel tube (round-body, riveted rolling-packed construction); piston rod: carbon steel with 20µm hard-chrome plating; covers: aluminium alloy. Thread options: PT (blank) / G / NPT. Every MA-series cylinder ships with a built-in magnet for CMSG / DMSG / EMSG position sensors.
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 MAC Stainless Steel Mini Air Cylinder MAC40X390SU
| MAC | Standard round-body mini cylinder (double-acting, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×390 | Stroke length in mm. |
| -S | Built-in magnet for CMSG / DMSG / EMSG sensors (standard on MA series). |
| CA / U / CM | Back-cover type: CA pivot, U flat-end, CM round-end. |
MA-family variants: MA / MAC (double acting ±cushion), MSA / MTA (single acting push / pull), MAD / MACD (double rod ±cushion), MAJ / MACJ (adjustable stroke ±cushion), MAR (cushioned with integrated F/U mount). Mounting accessories: FA flange, LB foot, SDB pivot; plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU Is Used
Machining centre door
Opens and closes a sliding guard door on a CNC machining centre, with both-end cushioning softening the full 390 mm travel.
Lane pusher
Pushes totes between conveyor lanes in a distribution warehouse, using the whole 390 mm stroke to clear the crossover.
Tray stack lifter
Raises a tray stack on a bakery packaging line; the 40 mm bore still lifts about 32 kg vertically once a 2:1 margin is kept.
Is the Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU the Right Cylinder?
For 390 mm of travel, check alignment before bore size: guide the load externally and keep lateral forces minimal, since a long 16 mm hard-chrome rod will bend under side abuse. Force-wise, the 32 mm bore offers 402.2 N push at 0.5 MPa and the 50 mm bore 981.3 N, against 628.3 N here. Ports are 1/8" and strokes beyond 500 mm become made-to-order items. Air loss lets the piston run free to either end - the cushion only softens the last few millimetres - so use a rod lock or pilot check valve to park a load mid-stroke. Mount with FA flange, LB foot or SDB bracket under the U back cover; CMSG, DMSG and EMSG switches drop straight on.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) is standard for sensors
- ✓ Back cover (CA/U/CM) & mount (FA/LB/SDB)
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 On first run, back off the cushion screws and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MAC Stainless Steel Mini Air Cylinder MAC40X390SU FAQ
At 0.5 MPa the MAC40X390SU develops 628.3 N of push and 527.8 N of pull; raise supply to 0.7 MPa and you get 879.6 N push and 738.9 N pull. The 1.0 MPa theoretical limit is 128.1 kgf. Operating range is 0.15-1.0 MPa (22-145 psi), proof pressure 1.5 MPa (215 psi), speed 30-800 mm/s.
No. Every MAC cylinder leaves the factory with the piston magnet fitted, so CMSG, DMSG or EMSG switches clamp straight onto the barrel to signal end positions. That also means stroke feedback can be added later without changing the cylinder itself.
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