Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X25-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X25-30S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm bore and 25mm 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
- Stroke25 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 MACJ20X25-30S
With just 25 mm of travel and a 30 mm on-site trim window, this MACJ packs a double-acting push and a variable air cushion at each end into a tight envelope. The stainless round barrel rolled onto aluminium covers, plus the hard-chrome plated rod, shrugs off splashes and washdown that would lift paint off ordinary painted-steel minis. Air supply runs 0.15-1.0 MPa (22-145 psi), proof tested to 1.5 MPa (215 psi), rod speed 30-800 mm/s.
At 0.5 MPa the 20 mm bore delivers 157 N of push - plan on roughly 94 N of real work so the cylinder is not running at its ceiling, enough to lift about 8 kg vertically with margin. The magnet is standard, so CMSG, DMSG or EMSG switches clip straight on. The adjuster is an extend-side end stop, not a mid-stroke brake - with air lost the rod can still drift back.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X25-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X25-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 25 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 MACJ20X25-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×25 | 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 MACJ20X25-30S Is Used
Small parts ejection
Trims the 25 mm extend stroke down to kick a finished pin off a machining fixture, cushioned so the part is not scratched.
Divider blades
Pushes short divert blades between conveyor lanes; the 157 N push at 0.5 MPa handles light cartons at line speed.
Capper push-off
Ejects capped vials from a rotary capper pocket, the stainless barrel coping with daily wipe-downs in the filling hall.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X25-30S the Right Cylinder?
If 157 N at 0.5 MPa is more than the job needs, the 16 mm bore of the MACJ16 still pushes 100.5 N; if the load grows, step up to MACJ25 for 245.3 N. Trim the extend stroke anywhere inside the 30 mm window with the stop screw; it sets position but will not hold a load against gravity when pressure drops. Mount FA flange or LB foot, add I or Y knuckles, and specify G or NPT thread if PT ports do not suit.
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 MACJ20X25-30S FAQ
At 0.5 MPa: 157 N push, 131.9 N pull. At 0.7 MPa: 219.8 N push, 184.7 N pull. Theoretical maximum at 1.0 MPa is 32 kgf. Working pressure is 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, and the extend stroke is trimmed within the 30 mm window by the stop screw.
The riveted stainless tube plus hard-chrome plated carbon-steel rod resist corrosion in damp or washed-down areas where painted minis rust. Both ends carry a variable air cushion, and the built-in magnet works with CMSG, DMSG and EMSG switches as standard.
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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