Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X75-20S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X75-20S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 75mm 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.
- BoreØ40 mm
- Stroke75 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke + cushion
- Rod threadM12×1.25
- 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 MACJ40X75-20S
Short strokes that repeat exactly: the MACJ40X75-20S pairs a 75 mm base stroke with a 20 mm adjustable window, so the extend position can be re-set on the machine rather than by swapping cylinders. It works double-acting with a variable cushion at each end, pushing 628.3 N and pulling 527.8 N at 0.5 MPa, or 879.6 N at 0.7 MPa, at speeds from 30-800 mm/s.
The riveted stainless barrel and 16 mm hard-chrome rod hold up in humid plants where painted minis bubble and seize, running on 0.15-1.0 MPa (22-145 psi) air. Do the buyer math once: 60 percent of the 0.5 MPa push leaves roughly 377 N for real work - enough to hoist a 32 kg palletized tray or clamp machined housings without slip. CMSG / DMSG / EMSG switches attach directly because the piston magnet is included from the factory.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X75-20S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X75-20S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 mm |
| Acting type | Double acting, adjustable stroke + cushion |
| Port size | 1/8" |
| Rod thread | M12×1.25 |
| 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 500 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | 739 N |
| Max (@1.0 MPa) | 128 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 MACJ40X75-20S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MACJ40X75-20S Is Used
Lab fixture clamping
Holding sample trays in an automated analyzer: 377 N of practical clamp force, a magnet-fed CMSG switch for closed-clamp confirmation, and gentle cushioned seating.
Pallet tray indexing
Raising filled trays up a 75 mm step between roller conveyors; the 20 mm window tunes lift height per tray size, and the cushion lands each tray quietly.
Valve test rig actuator
Seating small ball valves during leak tests: the adjustable window sets seat travel for different valve sizes, and the dual cushion prevents seat slam even at the 879.6 N of 0.7 MPa push.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X75-20S the Right Cylinder?
Match the bore to the task: a 20 mm MACJ manages only 157 N at 0.5 MPa while a 50 mm reaches 981.3 N, so the 40 mm suits medium-duty clamping, ejecting and lifting. The 20 mm adjuster is an extend-side end stop, not a position lock - expect drift if air is lost. Fit FA flange or LB foot mounts, bolt an I or Y knuckle on where the load swivels, and keep the 1/8 inch ports clear of restrictive fittings so the cushions do their job.
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 MACJ40X75-20S FAQ
Double-acting, 40 mm bore, 75 mm stroke with up to 20 mm of extend-stroke adjustment. Force: 628.3 N push and 527.8 N pull at 0.5 MPa; 879.6 N push and 738.9 N pull at 0.7 MPa; 128.1 kgf theoretical max at 1.0 MPa. Ports are 1/8 inch, the rod thread is M12x1.25, and the variable cushion works at both ends.
The magnet is built into the piston as standard on every MA-series cylinder - nothing to order specially. CMSG, DMSG and EMSG switches clip onto the stainless barrel for position feedback, and since the barrel resists corrosion they hold up in damp or washed-down areas too.
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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