Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-30S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm bore and 50mm 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.
- BoreØ20 mm
- Stroke50 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM8×1.25
- 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 MACJ20X50-30S
A 20 mm bore round-body mini cylinder built on a stainless barrel with a rolled, riveted cover joint, the MACJ20X50-30S is double-acting and carries a 30 mm adjustable extend window. The stop screw lets you trim the extend stroke down on site; it never lengthens travel past the ordered 50 mm. At 0.5 MPa it pushes with 157 N and pulls 132 N, rising to 220 N at 0.7 MPa.
Because the magnet ships as standard, CMSG / DMSG / EMSG switches clip on without a special piston. Plan work around roughly 94 N at 0.5 MPa rather than the full 157 N rating, which keeps the actuator inside a comfortable duty band. The two-way piston seal stores its own grease, the variable air cushion at both ends soaks up end-of-stroke shock, and the supply spans 0.15-1.0 MPa (22-145 psi) filtered to 40 um.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 50 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 300 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MACJ20X50-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×50 | Stroke length in mm. |
| -30 | 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 MACJ20X50-30S Is Used
Small-parts clamping fixture
A 157 N push at 0.5 MPa clamps aluminium brackets in a drilling jig; the 30 mm trim sets exact clamp depth per fixture.
Gate confirmation on a packaging line
Magnet standard, so a CMSG switch confirms full extension before the carton sealer fires.
Light pick-and-place ejector
Roughly 8 kg of vertical capacity with a 2:1 margin lifts small castings clear of a CNC fixture.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X50-30S the Right Cylinder?
Drop to the 16 mm bore (100.5 N push at 0.5 MPa) if the load is light and space is tight; step up to the 25 mm bore (245.3 N) once forces creep past about 94 N of real work. For fixed-travel jobs the cushioned MAC covers it, and MACD adds a second rod end. Mount via FA flange or LB foot, add I or Y rod knuckles where the load pivots, and remember the trim screw only shortens the extend stroke - it is not a brake that holds position when air is lost.
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 MACJ20X50-30S FAQ
At 0.5 MPa it pushes 157.0 N and pulls 131.9 N; at 0.7 MPa, 219.8 N push and 184.7 N pull. Theoretical maximum at 1.0 MPa is 32.0 kgf for this 20 mm bore.
An external stop screw trims the extend stroke anywhere inside the ordered 30 mm window; retraction stays full length. It is an end stop only - on air loss the piston still drifts, so add an external lock if you need position holding.
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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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