Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X140-30S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X140-30S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 140mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke140 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 MAJ40X140-30S
With a 30 mm adjustment window around a 140 mm stroke, this MAJ40 lets a technician dial in the extend position on the machine: the external stop screw trims the stroke down by up to 30 mm and holds that setting mechanically. Double-acting throughout, it delivers 628 N pushing and 528 N pulling at 0.5 MPa, rising to 880 N at 0.7 MPa.
Construction is the compact MA recipe: a stainless round barrel with riveted aluminium-alloy covers and a 16 mm hard-chrome steel rod that tolerates humid, washed-down corners far better than painted minis. Bumper pads are fixed at both stroke ends to soften impact - they are not an adjustable cushion; the MACJ carries that feature. Budget roughly 377 N for real work at 0.5 MPa, and figure on lifting about 32 kg vertically once a 2:1 margin is kept on the theoretical 64 kg.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X140-30S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X140-30S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 140 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 MAJ40X140-30S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 MAJ40X140-30S Is Used
Press die part ejection
Ejects stamped brackets from a mechanical press die; the 30 mm window lets die setters shorten the kick after tooling changes, pushing 628 N at 0.5 MPa.
Hopper dosing gate
Opens a slide gate under a small feed hopper dispensing granulate; the 140 mm stroke clears the gate pocket and the trim sets exactly how far the gate opens.
Rotary table indexing lock
Engages an indexing pin on a rotary assembly table; the stop screw pins the engaging depth so each station lands in the same angular position.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X140-30S the Right Cylinder?
Sizing check: a MAJ32X140 yields 402 N at 0.5 MPa; if the load needs more, this 40 mm bore is the largest MA makes, at 628 N. Pair the 16 mm male rod thread (M12x1.25) with an I or Y knuckle for swivelling loads, or fix the body via FA flange or LB feet - and the standard built-in magnet accepts CMSG, DMSG or EMSG switches on the barrel. The adjuster shortens the extend stroke only and is an end stop, not a brake; on air loss the piston moves freely. Over 140 mm of travel, keep the load aligned so side bending stays off the rod.
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 MAJ40X140-30S FAQ
This 40 mm bore produces 628 N push and 528 N pull at 0.5 MPa, 880 N push and 739 N pull at 0.7 MPa, and up to 128.1 kgf theoretically at 1.0 MPa. Supply is 0.15-1.0 MPa (22-145 psi) of 40 um filtered air; proof pressure 1.5 MPa (215 psi); rod speed 30-800 mm/s.
They soften the last part of travel to cut noise and end-of-stroke shock, but they are fixed - there is no screw to adjust deceleration. If the machine needs adjustable cushioning, the MACJ series is the version with that feature.
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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