Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-30S 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 MACJ40X125-30S
Bore 40 muscle in a compact round shell: the MACJ40X125-30S pushes 628.3 N at 0.5 MPa (527.8 N retracting), tops out near 128.1 kgf theoretically, and runs clean at 30-800 mm/s across 0.15-1.0 MPa (22-145 psi). Its 30 mm window trims the extend stroke down to a 95 mm minimum on site.
The stainless barrel plus hard-chrome plated rod gives it a real edge over painted-steel minis in humid plants or outdoor service, and the riveted aluminium-alloy covers keep the package short. A magnet comes fitted on every piston - standard, not an option - so CMSG, DMSG and EMSG switches drop straight onto the barrel. For real-world sizing, plan jobs around 377 N rather than the full rating, which equals roughly 32 kg of vertical lift at a 2:1 margin.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-30S |
|---|---|
| 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 MACJ40X125-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MACJ40X125-30S Is Used
Pallet diverter gate
A warehouse line gate swings wheeled dollies toward the sorter lane; 628 N of push at 0.5 MPa moves the load, and the 30 mm window matches the gate's parked angle exactly.
Outdoor wash gate actuator
A farm equipment wash-bay gate opens in rain and mud thanks to the stainless barrel and chrome rod; 879.6 N at 0.7 MPa covers a stiff hinge without upsizing the bore.
Coil car docking stop
A coil-car dock in a metal service centre uses the trimmed stroke to seat cars against a hard stop, with EMSG sensing confirming docked position on every cycle.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X125-30S the Right Cylinder?
Compare before you buy: dropping to bore 32 saves space but gives up force (402.2 N vs 628.3 N push at 0.5 MPa), and stepping to bore 50 buys 981.3 N for heavier work. On a 125 mm stroke, avoid cantilevered side loads - carry the payload in slides or bushings so the 16 mm rod stays straight and the chrome plating lasts. The window sets where the extend stroke finishes; it will not lock the piston against drift once air is removed. FA flange, LB foot and I / Y rod knuckles cover most fixings.
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 MACJ40X125-30S FAQ
The datasheet lists 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, and 128.1 kgf theoretical at 1.0 MPa. Run it on 0.15-1.0 MPa (22-145 psi) filtered air at 30-800 mm/s.
AirTAC offers an FA flange and an LB foot for the body, plus I and Y rod knuckles where the load pivots on a linkage. Thread choices are PT (blank), G and NPT on the 1/8" ports of this bore. Note that the adjustable stop sets where the extend stroke finishes but will not hold a load against drift when air is removed.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
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Most inquiries answered within 7-8 hours.
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