Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 120mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke120 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 MAJ40X120-30S
Travelling 120 mm instead of the typical 100 mm, this 40 mm bore MAJ covers deeper fixtures, and its external stop screw trims the extend stroke within a 30 mm window. At 0.5 MPa the bore generates 628 N pushing and 528 N pulling, rising to 880 N push on a 0.7 MPa supply.
Fixed anti-impact pads cushion both ends of travel without any adjustment, and the magnet built into the piston feeds CMSG, DMSG or EMSG switches straight away. For vertical duty the rod lifts about 32 kg once the 628 N rating is halved for a 2:1 margin. The stainless round barrel and riveted aluminium covers keep moisture out of a compact body.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 120 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 MAJ40X120-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 MAJ40X120-30S Is Used
Slide actuator on an inspection gantry
The 120 mm reach carries a camera head over long parts, with EMSG feedback confirming each stop position.
Lane diverter on a parcel sorter
Around 377 N of working force swings parcels into side lanes, with the trim stop set to the lane offset.
Mandrel lift on a tube bender
Lifting about 32 kg vertically with margin, the rod raises the mandrel clamp between bends in humid shop air.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S the Right Cylinder?
Compared with a 32 mm bore pushing about 402 N at 0.5 MPa, this cylinder carries roughly 56% more force, and no larger bore exists in the MA line - move to MACJ if you want cushions plus a wider tune range. Because the stop screw only sets the extend position, a dropped air line leaves the rod free to move; external clamping is required for load holding. FA flange and LB foot mounts plus I and Y knuckles cover fixture needs, and on a 120 mm stroke keep the 16 mm rod clear of 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 MAJ40X120-30S FAQ
Expect 628.3 N extend and 527.8 N retract at 0.5 MPa, or 879.6 N and 738.9 N respectively on 0.7 MPa. The theoretical peak at 1.0 MPa works out to 128.1 kgf. Pressure range 0.15-1.0 MPa (22-145 psi); travel speed 30-800 mm/s.
Pick an FA flange or an LB foot, and add an I or Y rod knuckle where the tool pivots; note that adjustable-stroke models offer no SDB or back-cover code. Air connects via 1/8" ports, the rod thread is M12x1.25, and working pressure runs 0.15-1.0 MPa (22-145 psi).
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.
Request a Quote for Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X120-30S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.