Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X350-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X350-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø50mm bore and 350mm 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
- Stroke350 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 MACJ50X350-20S
Think of this model as the tunable long-stroke option in AirTAC's MA line: 350 mm of base travel with a 20 mm stop-screw window, so maintenance can shorten the extend stroke between 330 and 350 mm on site. Behind that travel sits a 50 mm bore producing 981.3 N at 0.5 MPa (22-145 psi) and 1373.8 N at 0.7 MPa.
Vertically, the 0.5 MPa push is worth roughly 100 kgf, or about 50 kg of lifted weight with a 2:1 margin - useful when sizing a light counterweight or scissor assist. Construction is the usual MA recipe: stainless round barrel, hard-chrome 16 mm rod, rolled aluminium covers, magnet fitted as standard. A variable cushion at each end tames landings at stroke speeds anywhere in the 30-800 mm/s band.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X350-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X350-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø50 mm |
| Stroke | 350 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 MACJ50X350-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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 MACJ50X350-20S Is Used
Index dial stopper
Stopping a rotary index table against a fixed anvil needs a firm, repeatable push; set the stop screw within the 20 mm window so the anvil lands exactly on datum.
Lift-assist scissor
A small scissor lift raising trays of about 50 kg matches this bore's vertical capability at 0.5 MPa, with the dual cushion catching the top of travel.
Web-frame tensioner
Tensioning film or web across a 350 mm frame travel draws on the 880.8 N pull stroke; the magnet and an EMSG switch verify both tension and release positions.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ50X350-20S the Right Cylinder?
Compare real numbers before you size up: bore 40 gives 628.3 N at 0.5 MPa and bore 63 gives 1557.9 N, so if the application sits near 590 N of working force this 50 mm bore is the efficient choice. The 1/4 in. ports keep flow up over the long stroke; FA and LB mounts, or an I / Y knuckle, cover the fixing options. The 20 mm adjuster is purely an end-of-stroke limit - it neither holds a load nor extends travel beyond 350 mm, so trap air with a pilot-operated check where the load must stay put.
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 MACJ50X350-20S FAQ
At 0.5 MPa: 981.3 N extend, 880.8 N retract. At 0.7 MPa: 1373.8 N extend, 1233.1 N retract. The 1.0 MPa theoretical maximum is 200.1 kgf. For sizing, treat roughly 589 N as the practical continuous output and lift no more than about 50 kg vertically on a 2:1 margin.
Order FA flange or LB foot mounting, or an I / Y rod knuckle for a pivoting load. The 1/4 in. ports come threaded PT (blank), G or NPT, and the male rod thread is M14x1.5. Strokes beyond the 500 mm maximum standard for this bore are made to order.
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