Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X80-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X80-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 80mm 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
- Stroke80 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 MACJ40X80-20S
Ordering the MACJ40X80-20S buys you a 20 mm window: mount it, air it up, and shorten the extend stroke at the machine until the cycle is exactly right, with no re-order required. Double acting with variable cushions at both ends, the 40 mm bore delivers 628 N push and 528 N pull at 0.5 MPa within a 0.15-1.0 MPa (22-145 psi) supply range.
That 628 N works out to about 64 kg of vertical lift at the rating, so plan on roughly 32 kg with a 2:1 margin and match it against real part weights. Underneath, a riveted stainless barrel and hard-chrome 16 mm rod resist corrosion in wet or food-adjacent areas, and since the magnet ships standard, CMSG, DMSG and EMSG switches fit without a special-order piston.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X80-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X80-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 80 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 MACJ40X80-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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 MACJ40X80-20S Is Used
Product stop gate on a bottling line
Trim the extend stroke so bottles stop square against the rail; 628 N push at 0.5 MPa arrests a full lane of 500 mL PET containers.
Scrap ejector beside a blanking press
The 20 mm window dials in just enough travel to clear the die area between strokes without disturbing the blanks.
Chute diverter under a sorting conveyor
About 32 kg of vertical capability at half rating flips filled totes between lanes with no gearbox or linkage in the way.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X80-20S the Right Cylinder?
If the duty is light, the 32 mm bore gives 402 N push at 0.5 MPa; for heavier work the 50 mm bore offers 981 N, leaving this 40 mm model's 628 N as the middle pick for presses, gates and lifters. Speed it 30-800 mm/s and let the end cushions absorb the deceleration shock. FA flange and LB foot mounts are on the list, I and Y knuckles too. Treat the adjuster purely as an extend-stroke stop: with air lost, nothing locks the rod, so load holding must come from the circuit, not the cylinder.
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 MACJ40X80-20S FAQ
Design numbers for the 40 mm bore: 628 N push and 528 N pull at 0.5 MPa, 880 N push and 739 N pull at 0.7 MPa, and a 128 kgf theoretical peak at 1.0 MPa. The 80 mm stroke is adjustable over 20 mm, the port is 1/8", and the rod measures 16 mm.
Each end bleeds air progressively through the last part of travel, so a load moving at up to 800 mm/s decelerates smoothly instead of slamming the aluminium covers. That lets you raise cycle speed or carry heavier parts without end-of-stroke hammer.
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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