Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S is a genuine double acting, adjustable stroke 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.
- BoreØ40 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM12×1.25
- CushionFixed anti-impact bumper pads
- 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S
The MAJ40X250-30S is AirTAC's largest-bore mini cylinder in the round MA family: a 40 mm double-acting unit whose extend stroke can be shortened by up to 30 mm with an external stop screw, no cylinder swap required. At 0.5 MPa it pushes 628.3 N (about 64 kgf) and pulls 527.8 N, while the riveted stainless barrel and 20 um hard-chrome rod hold up in damp or washdown-prone corners that defeat painted housings.
Plan around roughly 377 N of usable push at 0.5 MPa to keep a comfortable margin, which translates to raising about 32 kg vertically at half the theoretical lift. A fixed anti-impact pad eases the piston into its end position, and the built-in magnet - standard on every MA - picks up CMSG, DMSG or EMSG switches without a special piston.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke |
| 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 | Fixed anti-impact bumper pads |
| 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 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 MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S Is Used
Carton lane pusher
Pushes cartons between conveyor lanes with 628 N at 0.5 MPa; the 30 mm stop-screw window lets line staff match the throw to lane width without ordering a new cylinder.
Washdown panel lifter
The stainless barrel shrugs off daily hose-down beside a dairy filler, raising about 32 kg of guard panel vertically with margin to spare.
Indexed part stop
Stops palletized parts at a vision-check station; the standard magnet and a DMSG switch confirm the stopped position on every cycle.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S the Right Cylinder?
For this 40 mm bore, stepping down to a 32 mm MAJ would drop push to 402.2 N at 0.5 MPa, so stay at 40 mm once your load climbs past roughly 350 N. There is no larger bore in this series, so heavier duties call for a different AirTAC family. The 250 mm rod travels at 30-800 mm/s; guide the load externally so side forces stay off the 16 mm rod.
Mount with the FA flange or LB foot, add an I or Y rod knuckle for a pivoting joint, and note that the stop screw is a mechanical end stop, not a brake - if air is lost, the rod can still drift.
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 Bumper models: keep speed within the rated range.
- check Installation by qualified personnel per AirTAC docs.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X250-30S FAQ
At 0.5 MPa it pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push rises to 879.6 N. The theoretical ceiling is 128.1 kgf at 1.0 MPa. Working pressure spans 0.15-1.0 MPa (22-145 psi) and rod speed runs 30-800 mm/s.
An external stop screw shortens the extend stroke anywhere within 30 mm of the full 250 mm. It is a mechanical end stop only, so on air loss the rod can still creep, and the fixed bumper pad merely softens the landing rather than acting as an air cushion.
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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