Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X400-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X400-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø50mm bore and 400mm stroke, 1/4" 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.
- BoreØ50 mm
- Stroke400 mm
- Port size1/4"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM14×1.5
- 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 MACJ50X400-20S
When a fixed-stroke MAC would overshoot its stop, the 20 mm window on this MACJ50X400-20S lets maintenance shorten the 400 mm extend stroke in the field - turn the external stop screw, lock it, done. Double-acting with variable cushioning at both ends, it runs 0.15-1.0 MPa (22-145 psi) and 30-800 mm/s. At 0.5 MPa the bore generates 981 N of push; at 0.7 MPa, 1374 N, topping out near 200 kgf theoretical.
AirTAC rolls the aluminium covers and stainless block onto the high-precision barrel - a riveted, round-body build in stainless steel that seals reliably in damp plants and outdoors, with 20 um of hard chrome on the rod. Because the magnet is standard, DMSG or CMSG switches snap on without a special piston. Budget about 589 N of real work at 0.5 MPa, or roughly 50 kg vertical lift with a 2:1 margin.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X400-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X400-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø50 mm |
| Stroke | 400 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/4" |
| Rod thread | M14×1.5 |
| 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 (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 881 N |
| 0.7 MPa | 1374 N | 1234 N |
| Max (@1.0 MPa) | 200 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 MACJ50X400-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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 MACJ50X400-20S Is Used
Stopper gate on pallet conveyor
Raise a stopper blade to hold pallets at a workstation; trimming 20 mm sets blade height exactly to the pallet deck, even after conveyor rebuilds.
Fork-home nudger on an AGV
Push an automated guided vehicle fork carriage to its docked home; the 20 mm window absorbs carriage tolerance so sensors always see the same home position.
Clamp swing on a welding fixture
Swing a clamp arm into a car-panel welding jig; dual-end cushioning stops the arm crisply so operators hear a clean, repeatable clamp every cycle.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X400-20S the Right Cylinder?
Compare against neighbours: a 40 mm bore gives 628 N at 0.5 MPa, a 63 mm bore 1558 N - pick the 50 mm if 981 N sits in your comfort zone. The trim stop shortens the extend stroke; it is not a mid-stroke brake, so the rod can drift if air pressure is lost and loads need separate holding. FA flange and LB foot mount it; I and Y knuckles adapt the rod end. With 400 mm of travel on a 16 mm rod, align the mounting precisely and keep the load guided to limit side thrust.
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 MACJ50X400-20S FAQ
Push at 0.5 MPa is 981.3 N and pull 880.8 N; at 0.7 MPa push is 1373.8 N with pull at 1233.1 N. Theoretical maximum force at 1.0 MPa reaches 200.1 kgf. Supply 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, 1/4 ports.
Yes - the variable air cushion at both ends is adjustable, so you can dial in deceleration for loads in the 981 N push class and run speeds from 30 to 800 mm/s. Start the cushion early for heavy or fast loads, then trim it back once end-of-stroke shock disappears.
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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