Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X55-50S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X55-50S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 55mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke55 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 MAJ40X55-50S
Short travel, full muscle: the MAJ40X55-50S packs a 628 N push at 0.5 MPa into just 55 mm of stroke, and the 50 mm adjust window lets you set the extend stop anywhere from 5 mm up to the full 55 mm. Retraction is air-driven too - 528 N of pull at 0.5 MPa - and at 0.7 MPa push reaches 880 N. Treating 377 N as the working ceiling keeps a healthy reserve on every cycle.
Its riveted, round-body construction rolls a stainless-steel barrel onto aluminium covers around a 16 mm hard-chrome rod, so splash zones and mild washdown do not eat the shell. The fixed anti-impact bumper only decelerates the stroke end; for adjustable cushioning you would move to the MACJ instead. The magnet comes built in, ready for CMSG / DMSG / EMSG switch mounting straight out of the box.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X55-50S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X55-50S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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 MAJ40X55-50S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×55 | Stroke length in mm. |
| -50 | 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 MAJ40X55-50S Is Used
Bench-top crimp press for wire terminals
A short effective stroke set via the 50 mm window delivers roughly 628 N to crimp terminals; drop to a 32 mm bore only if 402 N at 0.5 MPa suffices.
Clamp fixture on a CNC jig
Air clamps aluminium plates before milling, with the fixed bumper absorbing the snap at stroke end so the jig does not ring even at 800 mm/s.
Heat-seal head on a small pouch machine
Trims the extend stop so the 16 mm hard-chrome rod presses the sealing bar with about 377 N of practical force at 0.5 MPa, cycle after cycle.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X55-50S the Right Cylinder?
Sizing check: a 32 mm MAJ pushes 402 N at 0.5 MPa - adequate below roughly 240 N of working load - while this 40 mm bore stretches to 628 N and is the largest MA bore made, so nothing upsizes within the family. Ideal when a short clamp or press stroke needs big force. FA flange and LB foot mounts plus I and Y knuckles fit tight footprints; SDB is not offered on adjustable units. Remember the stop screw is a mechanical end stop, not a mid-stroke brake - with air lost the rod still drifts, so never use it to hang a load.
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 MAJ40X55-50S FAQ
At 0.5 MPa this cylinder pushes 628 N and pulls 528 N; at 0.7 MPa the figures are 880 N push and 739 N pull, with a theoretical maximum of 128 kgf at 1.0 MPa. The effective extend stroke is adjustable from 5 to 55 mm inside the ordered 50 mm window. Operating range: 0.15-1.0 MPa (22-145 psi), speed 30-800 mm/s, port 1/8", rod thread M12x1.25.
The stainless-steel barrel and hard-chrome plated rod shrug off moisture, splashed coolants and mild washdown far better than painted mini cylinders, and the rolled construction keeps the 40 mm bore body slim. The fixed bumper decelerates the piston at each stroke end to cut impact noise - it is not an adjustable air cushion, which is the MAC family's job.
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 MAJ40X55-50S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.