Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-40S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-40S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 125mm 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
- Stroke125 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 MACJ40X125-40S
Under the MACJ40X125-40S code sits a double-acting round-body mini cylinder with a 40 mm adjustable extend window and variable air cushion at both ends. At 0.5 MPa the bore 40 barrel pushes 628.3 N (pull 527.8 N), enough for clamping, ejecting and light lifting on compact machinery. An external stop screw trims the extend stroke anywhere from 85 to 125 mm on site.
The stainless barrel and 16 mm hard-chrome rod shrug off washdown splash and humid shop air that rusts painted mini bodies within a season, while the riveted aluminium covers keep the tube sealed for life. At 0.7 MPa output climbs to 879.6 N push. For sizing, count on roughly 377 N of usable push at 0.5 MPa, or a vertical lift of about 32 kg with a 2:1 margin. Every unit ships with a built-in magnet, so CMSG, DMSG or EMSG switches click on without special ordering.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-40S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-40S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 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 MACJ40X125-40S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MACJ40X125-40S Is Used
Fixture clamping on a CNC line
Trim the stroke to match each vise pattern; about 377 N of usable push at 0.5 MPa holds steel parts steady through machining.
Carton push-off at a case packer
628.3 N at 0.5 MPa shoves 5 kg cases off the belt, and the cushioned 125 mm stroke stops them without hammering the frame.
Small-part ejector under a press
The 85-125 mm extend range clears die sets of different heights while the stainless body ignores cutting-fluid mist.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-40S the Right Cylinder?
Bore 40 sits between the 32 mm MACJ (402.2 N push at 0.5 MPa) and the 50 mm MACJ (981.3 N), so choose it when your load needs a comfortable margin over a 32 but a 50 is overkill. The 40 mm adjuster shortens the extend stroke only - it is a mechanical stop, not a mid-stroke lock, so the rod still coasts if air is cut. Mount with the FA flange or LB foot, add an I or Y rod knuckle where the load swivels; adjustable models take no SDB. On a 125 mm stroke keep side load low and guide the part externally where possible.
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 MACJ40X125-40S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N. At 0.7 MPa the push is 879.6 N (pull 738.9 N), and the theoretical maximum is 128.1 kgf at 1.0 MPa. Working pressure runs 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof rating, piston speed 30-800 mm/s, and the 40 mm extend window is trimmed by a stop screw with variable air cushion at both ends.
No. Every MACJ carries a built-in magnet as standard, so CMSG, DMSG and EMSG switches mount directly on the stainless barrel for end-of-stroke or trimmed-position signals. The riveted round body - aluminium covers rolled onto the tube - holds its seal without fasteners working loose, and the 16 mm hard-chrome rod resists the corrosion that ends painted mini cylinders early in damp plants.
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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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