Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-40S 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 MACJ25X70-40S
A 25 mm round-body mini cylinder built for jobs where the rod must stop short of full travel: MACJ25X70-40S carries a 40 mm adjust window, so the extend stroke can be wound back on site with a screwdriver instead of swapping the cylinder. Double-acting drive, variable air cushion at both ends, 0.15-1.0 MPa (22-145 psi) supply, 30-800 mm/s speed.
The stainless barrel, riveted aluminium covers and 20 um hard-chrome rod shrug off the washdown and damp that pit painted minis. At 0.5 MPa it pushes 245.3 N and pulls 206.1 N; at 0.7 MPa push climbs to 343.4 N, with a 50 kgf theoretical peak at 1.0 MPa. Work to roughly 147 N of real push - about 12 kg lifted vertically with a 2:1 margin.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-40S |
|---|---|
| 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 MACJ25X70-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 25 | Bore size in mm. |
| ×70 | Stroke length in mm. |
| -40 | 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 MACJ25X70-40S Is Used
Stopper pin on a CNC bar feeder
Trim the extend stroke so the pin rises just clear of rotating bar stock; 245 N at 0.5 MPa holds light billets against the vee.
Carton ejector on a case packer
The 40 mm window lets one cylinder serve tall and short cartons; cushions keep the 245.3 N push gentle on thin board.
Gate diverter on a sorting conveyor
Set the gate throw precisely per lane with the stop screw; the standard magnet feeds a CMSG switch for lane-occupied signals.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ25X70-40S the Right Cylinder?
Going one bore down to 20 mm costs force (157 N push at 0.5 MPa); one bore up to 32 mm buys 402.2 N - this 245.3 N model sits between them. Note the adjuster is a mechanical end stop for extend travel, not a mid-stroke lock: drop air and the piston still drifts, so fit a locking or check valve if position must hold. FA flange or LB foot mounting, I and Y rod knuckles available, and the built-in magnet accepts CMSG / DMSG / EMSG switches as standard. At 70 mm stroke, keep the 10 mm rod square to the load to limit side-load wear.
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 MACJ25X70-40S FAQ
At 0.5 MPa: 245.3 N push, 206.1 N pull. At 0.7 MPa: 343.4 N push, 288.5 N pull. Theoretical maximum at 1.0 MPa is 50 kgf. Supply runs 0.15-1.0 MPa (22-145 psi) with speed from 30 to 800 mm/s.
Yes - the piston magnet is standard on every MA-series cylinder. Clip a CMSG, DMSG or EMSG switch onto the stainless barrel to report end positions through both cushioned ends, no special-order piston needed.
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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