Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø25mm bore and 70mm 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.
- BoreØ25 mm
- Stroke70 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM10×1.25
- 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 MACJ25X70-20S
A 20 mm trim window on a bore 25 body makes the MACJ25X70-20S the pick for machines where the stroke only needs small in-service correction. AirTAC rolls the stainless-steel barrel, aluminium covers and a stainless block into one riveted assembly, and the hard-chrome plated 10 mm rod slides on a grease-storing two-way seal - construction that survives washdown and outdoor humidity far better than painted minis.
Performance is pure bore 25: 245.3 N push and 206.1 N pull at 0.5 MPa, cushioned at both ends and adjustable in extend. Budget around 147 N for sustained work, enough to raise a 12 kg part vertically with a 2:1 safety margin. Pressure span 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 70 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 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 MACJ25X70-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×70 | 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 MACJ25X70-20S Is Used
Checkweigher reject pusher
A checkweigher kick-arm rejects underweight packs with a short, repeatable push; the 20 mm window absorbs the small stroke tweaks needed when pack formats change, and the dual cushion stops the arm bouncing at high speeds.
Label-head gap adjust
Print-and-apply label heads need their pad-to-box gap nudged as liner thickness varies; the 70 mm base stroke with 20 mm of trim covers head cleaning access and running position in one cylinder.
Battery tab press
In a small battery-assembly press, the regulated 245 N push seats foam pads onto cell stacks; the stainless exterior tolerates the dry-room's occasional wipe-down without corrosion bloom.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-20S the Right Cylinder?
Compare before you commit: the 20 mm bore offers 157 N at 0.5 MPa for light duty, while the 32 mm bore lifts output to 402.2 N - this 25 mm size splits them for medium clamping and pushing. The -20 stop sets extend length; it is not a mid-stroke lock, and a dropped air line leaves the piston free to coast, so external locking stays your responsibility. Every unit carries a standard magnet for CMSG / DMSG / EMSG switches, and FA flange or LB foot mounting, plus I and Y rod knuckles, covers the common fixing styles.
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 MACJ25X70-20S FAQ
Bore 25, double-acting: 245.3 N push and 206.1 N pull at 0.5 MPa, climbing to 343.4 N push and 288.5 N pull at 0.7 MPa. Theoretical output peaks near 50 kgf at 1.0 MPa. Operating window 0.15-1.0 MPa (22-145 psi), proof 1.5 MPa (215 psi), speed 30-800 mm/s.
The rolled stainless barrel with a 20 um hard-chrome plated carbon-steel rod shrugs off washdown mist, condensation and outdoor exposure that pit painted or bare-aluminium bodies. The riveted covers keep the joint sealed for life, and with the standard magnet you can still fit CMSG, DMSG or EMSG switches anywhere along the tube.
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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