Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X40-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X40-30S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm bore and 40mm 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
- Stroke40 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 MACJ20X40-30S
Taller adjustment span: with -30 the extend stroke of this 40 mm MACJ can be set anywhere from 10 mm up to the full 40 mm, holding 157 N push at 0.5 MPa (32 kgf theoretical at 1.0 MPa) across the whole range.
Construction is a round-body riveted unit - stainless barrel, hard-chrome plated carbon-steel rod, aluminium covers - built to survive damp food and outdoor air. The 30 mm window plus variable cushions at both ends lets you tune stop position and deceleration together, useful at cycle speeds up to 800 mm/s. For real work budget about 94 N, keeping 0.6 of the rating in reserve. Pressure band is 0.15-1.0 MPa (22-145 psi).
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X40-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X40-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 40 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 MACJ20X40-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 MACJ20X40-30S Is Used
Tote dividers
Pushes tote dividers to indexed positions in a warehouse picking station, adjusted across the 30 mm span as tote sizes change.
Rotary table detent
Drives an indexing table detent; the wider window suits tooling variants with different detent depths.
Label head tracking
Feeds a labelling head against the product web; cushioned ends keep the head from bouncing at line speed.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X40-30S the Right Cylinder?
Related types worth a look: MACJ is the cushioned adjustable pick, MAJ adds rubber bumpers in place of cushioning, MAC is fixed stroke. Smaller MACJ16 gives 100.5 N at 0.5 MPa; larger MACJ25 gives 245.3 N - choose by load margin, not just bore. Foot (LB) or flange (FA) mounting, optional I / Y knuckles. With a 40 mm stroke side loads are modest, but keep the rod square to the load to protect the bushings.
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 MACJ20X40-30S FAQ
Push is 157.0 N and pull 131.9 N at 0.5 MPa. Boost to 0.7 MPa and you get 219.8 N and 184.7 N respectively, with a 32 kgf theoretical maximum at 1.0 MPa. Working band: 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s.
A high-precision stainless-steel barrel with a hard-chrome plated carbon-steel rod, and aluminium-alloy covers rolled onto the tube for a sealed riveted body. This round-body mini construction handles damp, food-wash and outdoor locations well.
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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