Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X75-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X75-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 75mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke75 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 MAJ40X75-20S
For stations that need their clamp travel decided on the shop floor, the MAJ40X75-20S ships as a 75 mm double-acting cylinder whose extend stroke can be wound in up to 20 mm via an external stop screw. Push force at 0.5 MPa is 628.3 N and pull is 527.8 N, enough to lift about 64 kg of dead weight in theory, or a more honest 32 kg once a 2:1 safety factor is applied to a vertical lift.
Each end of the stroke lands on a fixed anti-impact pad, so the piston decelerates into the stop instead of hammering the aluminium cover. Build-wise you get a stainless round barrel riveted to the covers, a hard-chrome 16 mm rod, and the magnet that is standard across the whole MA series. Mount on the FA flange or LB foot options, or add I / Y knuckles at the rod end.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X75-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X75-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 MAJ40X75-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 MAJ40X75-20S Is Used
Carton index stop
On a warehouse carton indexer, the 20 mm window lets one cylinder model serve carton depths that vary by 20 mm, pushing 628.3 N at 0.5 MPa to square stacks against a back plate.
Weldment locating clamp
Fixture builders use the stop screw to set exact locating depth on welded brackets, while the fixed bumper pads keep the 16 mm rod from slamming the head at up to 800 mm/s.
Bench-top part elevator
Lifting jigs up to about 32 kg vertically stay inside a 2:1 margin at 628.3 N push, ideal for a feeder raising PCB carriers between two work levels.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X75-20S the Right Cylinder?
Between the 32 mm bore (402.2 N push at 0.5 MPa) and this 40 mm unit there is no middle step, so if 628.3 N is far more than the job needs, the 32 mm MAJ saves space and air. The adjuster sets a mechanical stop on extension only; it will not hold a load in place if supply pressure drops, so add a locking device where that matters. With the 20 mm window, DMSG or CMSG switches on the standard magnet can signal the trimmed extend position, and the 1/8" ports keep plumbing simple.
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 MAJ40X75-20S FAQ
Double-acting on 0.5 MPa air it pushes 628.3 N and retracts with 527.8 N; at 0.7 MPa push climbs to 879.6 N, and the theoretical ceiling is 128.1 kgf at 1.0 MPa. Practical sizing keeps to roughly 377 N of push so the cylinder lasts. The stroke can be shortened up to 20 mm from 75 mm with the stop screw, speed range is 30-800 mm/s, and ports are 1/8".
FA flange and LB foot brackets are the catalogue options, with I or Y rod knuckles available for the clevis side; the adjustable version has no SDB or back-cover alternative to order. The 1/8" port appears on both covers since this is a double-acting unit. Because a magnet ships inside every MA piston, CMSG and EMSG switches need no special piston order.
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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