Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-20S 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 MACJ20X70-20S
A 70 mm stroke with a 20 mm on-site trim gives the MACJ20X70-20S an extend range of 50 to 70 mm, double-acting and cushioned at both ends. The bore 20 barrel delivers 157 N push and 131.9 N pull at 0.5 MPa, enough to raise roughly 8 kg vertically once you halve the rating for a safe margin.
Coolant mist and outdoor damp are where the stainless barrel and hard-chrome plated 8 mm rod earn their keep, outlasting painted-steel minis. The magnet comes standard too, so a CMSG, DMSG or EMSG switch signals end positions without any special-order hardware.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-20S |
|---|---|
| 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 MACJ20X70-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 20 | 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 MACJ20X70-20S Is Used
Saw offcut pusher
Sweeps aluminium extrusion offcuts off a saw table; 157 N at 0.5 MPa clears light stock and the 20 mm trim is set to match the scrap-chute position.
Grinder fixture clamp
Clamps small workpieces on a surface grinder fixture; the stainless barrel and chrome rod stand up to coolant mist thrown off by the wheel.
Dust gate actuator
Opens and closes a blast gate on a woodshop dust collector; a CMSG switch on the built-in magnet tells the controller whether the gate is fully open.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ20X70-20S the Right Cylinder?
Size against the neighbours: bore 16 gives 100.5 N at 0.5 MPa, bore 25 gives 245.3 N; this bore 20 sits between with 157 N push, enough to lift about 8 kg vertically once a 2:1 margin is applied. On a 70 mm stroke keep side loads off the 8 mm rod - guide the load externally if the tooling overhangs.
The 20 mm trim shortens the extend stroke from 70 mm to a 50 mm minimum; it holds position mechanically at the end of travel only and will not stop drift on air loss. Choose FA flange or LB foot mounting and pair the standard magnet with an EMSG or CMSG switch for end-of-stroke signals.
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 MACJ20X70-20S FAQ
At 0.5 MPa: 157 N push, 131.9 N pull. At 0.7 MPa: 219.8 N push, 184.7 N pull. At the 1.0 MPa theoretical limit that works out to 32 kgf. Air supply 0.15-1.0 MPa (22-145 psi), 40 um filtration, speed 30-800 mm/s.
Mount on an FA flange or LB foot, with I or Y rod knuckles available on the M8x1.25 male thread; SDB and the back-cover code are not offered on adjustable models. The air port is 1/8" and the magnet, fitted as standard, accepts CMSG or EMSG switches.
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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