Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-30S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø20mm 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.
- BoreØ20 mm
- Stroke70 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 MACJ20X70-30S
AirTAC builds the MACJ20X70-30S around a riveted round barrel of stainless steel with a hard-chrome plated carbon-steel rod, so this 20 mm bore unit shrugs off washdown and damp shop air that ruins painted mini cylinders. It is double-acting with a variable air cushion at both ends, and the position magnet comes fitted as standard.
The 30 mm window lets you trim the extend stroke on site with an external stop screw, so one cylinder serves several fixture depths. At 0.5 MPa it pushes 157 N and pulls 131.9 N; plan roughly 94 N of real work so the actuator is not running at its ceiling. That equals lifting about 8 kg vertically with a 2:1 margin.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 70 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 MACJ20X70-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 MACJ20X70-30S Is Used
Stamping die ejection
Ejects small formed parts out of a punch die; 157 N at 0.5 MPa is ample for light-gauge offcuts, and the 30 mm window absorbs die-to-die depth differences.
Labeling line pusher
Pushes small cartons sideways onto a labeling head on a packaging conveyor, with the variable cushion stopping containers softly at cycle speeds up to 800 mm/s.
Sorting chute diverter
Flips a deflector gate on a small-parts sorting chute; the stainless barrel copes with coolant mist around machining-cell conveyors.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-30S the Right Cylinder?
Compare bores before ordering: the 16 mm MACJ makes about 100.5 N at 0.5 MPa, this 20 mm unit 157 N, and the 25 mm steps up to 245.3 N. The stop screw is a stroke trim, not a brake - if the air drops, the piston drifts, so add a locking valve where a load must stay put. FA flange or LB foot mounting plus I and Y rod knuckles cover the fit-up, and CMSG, DMSG or EMSG switches clip straight onto the standard magnet.
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 MACJ20X70-30S FAQ
Double-acting at 0.15-1.0 MPa (22-145 psi): push 157.0 N and pull 131.9 N at 0.5 MPa, push 219.8 N and pull 184.7 N at 0.7 MPa, 32 kgf theoretical at 1.0 MPa. Bore 20 mm, rod 8 mm (M8x1.25), 1/8 in port, extend stroke trimmed within a 30 mm window, variable cushion both ends, speed 30-800 mm/s, magnet standard for CMSG / DMSG / EMSG switches.
A stop screw at the head shortens the extend stroke to any length inside the 30 mm window; it never lengthens travel past 70 mm. The variable air cushion at both ends is set separately, so faster cycling or heavier stops land softly on the covers. The screw is an end stop only - with air removed the piston still drifts, so use valving to hold a load.
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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