Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 55mm 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
- Stroke55 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM12×1.25
- 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S
Within the MA mini family this 40 mm bore unit trades a wide trim window for precision: the MACJ40X55-20S holds a 55 mm stroke that the stop screw can shorten by up to 20 mm once it is on the machine. Double-acting with cushioned ends, it takes 0.15-1.0 MPa (22-145 psi) and cycles at 30-800 mm/s. The 628 N push at 0.5 MPa translates into about 64 kg of vertical lift capability, or 32 kg with a 2:1 safety factor.
The body is a stainless round barrel rolled onto the aluminium covers, with the 16 mm rod hard-chrome plated against corrosion and scoring - a build that suits humid or lightly washed areas. The trim screw is an end stop, not a load lock: if air pressure drops the piston can still drift. Mount FA flange or LB foot, add I or Y knuckles, and clip a CMSG or EMSG switch onto the standard magnet.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 mm |
| Acting type | Double acting, adjustable stroke + 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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -20 | Adjustable stroke window (mm the extend stroke can be shortened on site). |
| -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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S Is Used
Dot peen marking head
A dot-peen or ink stamp on an ID marking station presses at about 350 N; this bore's 628 N at 0.5 MPa gives the margin, and the 20 mm trim sets the strike height exactly.
Fixture stop pin
On a machining fixture, the rod advances a locating pin and retracts clear; about 32 kg of vertical lift capability suits heavier pins, sensed by a CMSG switch on the standard magnet.
Label press roller
Pressing labels onto cosmetic bottles takes a short, controlled push - the 20 mm window plus dual cushion gives a crisp, shock-free press cycle at 30-800 mm/s.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S the Right Cylinder?
Between the 32 mm bore (402 N push at 0.5 MPa) and the 50 mm bore (981 N), this 40 mm bore's 628 N is the pragmatic middle for marking heads and small presses. If you need to trim more than 20 mm, step up to the -40 or -50 window version of the same bore. The trim stop limits travel but is not a load-holding device; on pressure loss the piston can drift, so add a locking valve where the load must stay put. Flange (FA), foot (LB) and I or Y knuckle mounting all work, and every piston carries its magnet for CMSG, DMSG or EMSG switches.
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 MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X55-20S FAQ
Count on 628 N extend and 528 N retract at 0.5 MPa. At 0.7 MPa it reaches 880 N extend and 739 N retract, and the theoretical peak at 1.0 MPa (145 psi) is 128 kgf on a 40 mm bore with a 16 mm rod.
The -20 window means the extend stroke can be shortened by up to 20 mm from the 55 mm base once the stop screw is set; it cannot make the stroke longer. The screw is an end stop, not a brake - on air loss the piston drifts, so fit a separate holding valve if the load must stay put.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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