Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-30S is a genuine double acting, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 250mm 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
- Stroke250 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 MACJ40X250-30S
Reach plus tuning: this 40 mm bore MACJ moves a load 250 mm and still lets you shave up to 30 mm off the extend stroke once the machine is built. Double-acting with a variable cushion at each end, it turns 0.5 MPa into 628.3 N of push and 527.8 N of pull, and 0.7 MPa into 879.6 N. The stainless barrel with its rolled, riveted covers and hard-chrome 16 mm rod stands up to damp, dusty or washed-down environments.
Do the vertical math once and forget it: 628.3 N at 0.5 MPa is about 64 kg of lift at full pressure, so a 32 kg payload leaves a comfortable 2:1 reserve. For horizontal work, budget around 377 N and the cylinder will last. Sensing needs no extras - the magnet is standard and CMSG, DMSG or EMSG switches mount straight on. Speed range 30-800 mm/s; pressure 0.15-1.0 MPa (22-145 psi).
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 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 MACJ40X250-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 MACJ40X250-30S Is Used
Extending a stop arm on an assembly conveyor
A 250 mm reach into the line with the 30 mm window dialling in exact part positioning.
Latch actuator on a machine guard
Driving a sliding latch on an interlocked guard; the cushioned ends stop the latch slamming home.
Height probe on a filling line
Positioning a check probe between low and high fill levels, trimmed to each bottle format in use.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X250-30S the Right Cylinder?
If 628.3 N is more than the job needs, the 32 mm bore gives 402.2 N at 0.5 MPa; if it falls short, the 50 mm reaches 981.3 N. Choose FA flange or LB foot, I or Y knuckles for the rod end (male thread M12x1.25), and 1/8" ports - PT blank as delivered, G or NPT to order. With a 250 mm stroke, keep side loads off the rod - external guides protect the 16 mm hard-chrome shaft over long travel. Remember the adjuster sets the extend stop; it is not a brake, and a load can still drift if air pressure drops.
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 MACJ40X250-30S FAQ
At 0.5 MPa: 628.3 N push, 527.8 N pull. At 0.7 MPa: 879.6 N push, 738.9 N pull. Theoretical peak: 128.1 kgf at 1.0 MPa. A practical working figure at 0.5 MPa is about 377 N.
The rolled stainless barrel and 20 um hard-chrome plated rod resist corrosion in washdown, food-adjacent and outdoor stations where painted mini cylinders fail, while the two-way piston seal stores grease for long, low-friction service.
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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