Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S
The AirTAC Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S is a genuine double acting, double rod, adjustable stroke + cushion standard round-body mini air cylinder with a Ø40mm bore and 25mm 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
- Stroke25 mm
- Port size1/8"
- Acting typeDouble acting, double rod, 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 MACJ40X25-30S
A 40 mm bore packed into a riveted round barrel, the MACJ40X25-30S runs double-acting with a 30 mm extend-stroke trim window and a variable air cushion at both ends. At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa that rises to 879.6 N on the extend side. The stainless barrel and hard-chrome plated rod (20 um) shrug off washdown and damp shop air better than painted mini bodies, and the rolling-packed aluminium covers keep the seal intact through millions of cycles.
For real work at 0.5 MPa, size the task to roughly 377 N rather than the full 628.3 N rating - that margin keeps the 16 mm rod from lugging. A magnet is built in as standard, so CMSG, DMSG or EMSG reed switches clip straight onto the barrel without a special piston. Operating range is 0.15-1.0 MPa (22-145 psi) at speeds of 30-800 mm/s.
Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S Technical Specifications
| Model | Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S |
|---|---|
| Series | MACJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 mm |
| Acting type | Double acting, double rod, 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 | Force (both ways) |
|---|---|
| 0.5 MPa | 528 N |
| 0.7 MPa | 739 N |
| Max (@1.0 MPa) | 108 kgf |
MAJ / MACJ are double-rod: the rear rod that carries the stroke adjuster exits the rear cover, so both piston faces lose rod area. The rod-side (annular) area is used for both directions (conservative).
Model Code: Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S
| MACJ | Standard round-body mini cylinder (adjustable-stroke, variable cushion). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 (double rod, 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 MACJ40X25-30S Is Used
Pneumatic clamp on a welding fixture
Short-stroke clamping of brackets before weld - the 30 mm window lets the jig builder trim clamp travel to the part after trials.
Push-off gate on a conveyor line
Ejecting cartons or offcuts sideways at up to 800 mm/s; the dual cushion keeps the 25 mm stop from hammering the covers.
Box kicker on a packaging machine
Diverting packs at a transfer point; the practical 377 N working force handles loaded cartons without slamming.
Is the Airtac MACJ Stainless Steel Mini Adjustable Cylinder MACJ40X25-30S the Right Cylinder?
The 25 mm stroke suits clamping, ejecting or sorting moves where a few millimetres of on-site trim matter - the -30 window lets you shorten the extend stroke from the ordered 25 mm with a stop screw; it cannot lengthen past it. Note the stop only sets the extend position: if air is lost the piston can still drift, so fit a separate lock where loads must stay put. Next bore down, the MACJ32 pushes 402.2 N at 0.5 MPa; one up, the MACJ50 reaches 981.3 N. Mount with FA flange or LB foot, add I or Y rod knuckles where the linkage needs them, and port it at 1/8" (PT blank, G or NPT to order).
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 MACJ40X25-30S FAQ
The theoretical maximum is 128.1 kgf at 1.0 MPa. Plan real work around 377 N (about 60% of the 0.5 MPa push) for a durable margin.
No. Every MA-series cylinder ships with a magnet in the piston as standard, so CMSG, DMSG or EMSG switches mount directly on the stainless barrel - no special-order piston and no extra charge for the magnet itself.
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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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