Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X350-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X350-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 350mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke350 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 MAJ40X350-20S
Air feeds both chambers of this 40 mm bore MAJ, so it extends and retracts under power across a 350 mm stroke, and a stop screw on the cover trims the extend travel down within a 20 mm window with no shims. At 0.5 MPa the piston pushes 628.3 N and pulls 527.8 N; that push equals lifting roughly 64 kg straight up, or about 32 kg once you keep a 2:1 safety margin.
Construction follows AirTAC's riveted mini format: a stainless round barrel, aluminium-alloy covers and a stainless-steel block rolled into one sealed body, with a 16 mm hard-chrome plated rod that shrugs off rust in outdoor or washdown air. Fixed anti-impact bumper pads soften each end of travel - they decelerate but are not an adjustable cushion, which is what MACJ adds. Remember the trim screw is a hard stop for extend only, not a brake: with air off the piston can still be back-driven.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X350-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X350-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 MAJ40X350-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×350 | Stroke length in mm. |
| -20 | 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 MAJ40X350-20S Is Used
Pallet squaring stop
Squares cartons entering a palletizing cell, using the 20 mm trim to set an exact stop face against the stack edge.
Jar labeling press
Presses self-adhesive labels onto 1 L sauce jars, where 628 N at 0.5 MPa seats the label without crushing the lid.
Tote kicker on merge line
Kicks empty totes from a merge conveyor into a return lane; 527.8 N of pull force retracts the kicker arm under full air control.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X350-20S the Right Cylinder?
Step down to the 32 mm bore (402.2 N push at 0.5 MPa) for lighter gates, or stay at 40 mm - the biggest MA bore - when 628 N is your target; there is no larger bore in this family, so heavier jobs point to a bigger series. For position sensing the built-in magnet pairs with CMSG / DMSG / EMSG switches out of the box, and FA flange or LB foot mounts plus I / Y rod knuckles handle most fixturing. Because a 350 mm rod is long, support any off-axis load with an external guide instead of letting the rod take side thrust.
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 MAJ40X350-20S FAQ
At 0.5 MPa this bore pushes 628.3 N and pulls 527.8 N; at 0.7 MPa push reaches 879.6 N (pull 738.9 N). Peak theoretical force is 128.1 kgf at 1.0 MPa, within a 0.15-1.0 MPa (22-145 psi) band and a 30-800 mm/s speed range.
No - every MA-series cylinder, this one included, ships with a magnet built in as standard, so CMSG, DMSG or EMSG reed sensors clip to the barrel without any special-order piston. Mounting choices are FA flange, LB foot, plus I and Y rod knuckles.
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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