Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm bore and 225mm 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
- Stroke225 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 MACJ20X225-40S
Trim the extend stroke by up to 40 mm after installation and the MACJ20X225-40S still behaves like a fixed-stroke unit: double-acting, cushioned at both ends, and rated for 157 N of push at 0.5 MPa. Its stainless round barrel and hard-chrome carbon-steel rod are rolled into the aluminium covers for a sealed, riveted body.
That 40 mm window is a mechanical end stop for the extend side only - it sets the stopping point, it does not lock the piston, so on air loss the rod will still drift. For duty in wet or dusty corners, the stainless tube resists the corrosion that swells painted minis. Count on about 94 N of practical working force at 0.5 MPa rather than the full 157 N, and check the 225 mm stroke for side load before fixing the mount.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 225 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 MACJ20X225-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×225 | 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 MACJ20X225-40S Is Used
Tote stopper
Stopping plastic totes one at a time at a conveyor metering point; about 94 N of working force at 0.5 MPa covers both empty and loaded totes.
Deburr jig clamp
Clamping thin aluminium brackets during deburring - the cushions keep the clamp plate from slamming into the fixture at 800 mm/s.
Inspection lane changer
Switching blister packs between two inspection lanes, the 40 mm adjuster trimmed so the pusher never over-travels the second lane.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S the Right Cylinder?
Sizing rule of thumb: if 100.5 N from a 16 mm bore falls short and 245.3 N from a 25 mm bore is overkill, this 20 mm cylinder's 157 N at 0.5 MPa is the fit. The 40 mm adjustable window shortens the extend stroke on site but will not arrest the piston if air is lost - plan a separate holding method. Mount via FA flange or LB foot; I and Y rod knuckles suit pivoting tool links. Because 225 mm is a long stroke for an 8 mm rod, align the load or add external guides to protect the chrome plating.
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 MACJ20X225-40S FAQ
Push is 157 N and pull is 131.9 N at 0.5 MPa; at 0.7 MPa expect 219.8 N and 184.7 N. The 1.0 MPa theoretical limit is 32 kgf. Operating band is 0.15-1.0 MPa (22-145 psi) with speed adjustable from 30 to 800 mm/s.
No. The 40 mm adjuster is a mechanical stop for the extend stroke, not a brake, so the rod still drifts when pressure drops - fit an external stop or locking valve where holding matters. Mount with the FA flange or LB foot, and use I or Y rod knuckles if the tooling needs a pivoting link.
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.
Related AirTAC MACJ Cylinders
Request a Quote for Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X225-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.