Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X40-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X40-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 40mm 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
- Stroke40 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 MACJ40X40-20S
With 628.3 N of push at 0.5 MPa from a 40 mm bore, the MACJ40X40-20S brings serious force to a body barely longer than its own stroke. It is double-acting, its extend stroke is adjustable on site across a 20 mm window, and a variable air cushion at each end lets you tune the landing for whatever the line is moving that shift.
The barrel is stainless steel rolled onto aluminium covers with a hard-chrome plated carbon rod - the MA construction that takes washdown mist and coolant splash in stride where painted mini cylinders rust through. Dividing 628.3 N by gravity gives a 64 kgf vertical equivalent; with a 2:1 design margin that is about 32 kg of lifting capacity, and the fitted magnet means CMSG / DMSG / EMSG switches simply bolt on.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X40-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X40-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 40 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 MACJ40X40-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 MACJ40X40-20S Is Used
Stopper pin queuing totes on a roller conveyor
A pop-up stopper on a tote handling line catches each tub for picking; 628.3 N at 0.5 MPa resists the line thrust and the 20 mm window sets how the pin retracts clear of the rollers.
Pushing blister packs into an end-of-line carton
Grouped blister packs slide into an open carton in one 40 mm shove; the end cushion keeps the pack edges crisp instead of crushed at high line speeds.
Lid press on a tub-filling carousel
Snap-on lids on dairy tubs need a consistent short press; the adjustable stop maintains press depth when operators change tub size, and sensors flag a lid that did not seat.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X40-20S the Right Cylinder?
Against neighbours: the 32 mm MACJ makes 402.2 N and the 50 mm bore makes 981.3 N at 0.5 MPa, so pick this 40 mm when the load sits between those bands. Retract force is 527.8 N, lower because the rod takes up bore area. The 20 mm stop screw sets where extension finishes; it does not hold position against a dropped supply, so use a shut-off valve or external clamp where the load must stay put. FA flange and LB foot mountings, plus I and Y rod knuckles, cover most fixture layouts on the 16 mm rod.
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 MACJ40X40-20S FAQ
At 0.5 MPa: 628.3 N push, 527.8 N pull. At 0.7 MPa: 879.6 N push, 738.9 N pull. Theoretical peak at 1.0 MPa: 128.1 kgf. Ports are 1/8", rod thread M12x1.25, rod 16 mm, and the cushion is variable at both ends.
Even short strokes slam near the top of the 30-800 mm/s range; the adjustable air cushion bleeds off the last fraction of travel at both ends, so the piston decelerates gently instead of peening the covers - extending service life and letting you run fast cycles with heavier tooling.
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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