Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X165-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X165-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø20mm bore and 165mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ20 mm
- Stroke165 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM8×1.25
- 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 MAJ20X165-20S
Fine trimming is the point of the MAJ20X165-20S: an external stop screw narrows the 165 mm extend stroke down to 145 mm, handy when a fixture face sits closer to nominal than the drawing says. Double-acting on both ports, it pushes 157.0 N and pulls 131.9 N at 0.5 MPa inside a 0.15-1.0 MPa (22-145 psi) operating band.
Under the skin is a stainless round barrel rolled onto aluminium covers - no tie rods, no profile slot - with a hard-chrome plated 8 mm carbon-steel rod. Count on about 94 N of real push at 0.5 MPa after a sensible margin, enough to lift roughly 8 kg vertically at 2:1, while the built-in magnet pairs with CMSG, DMSG or EMSG switches straight from stock.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X165-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X165-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 165 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M8×1.25 |
| 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 300 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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 132 N |
| 0.7 MPa | 220 N | 185 N |
| Max (@1.0 MPa) | 32 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 MAJ20X165-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×165 | 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 MAJ20X165-20S Is Used
Label-head press on shrink wrappers
The stop screw dials the press travel between 145 mm and 165 mm to match different label-head heights, and the 157 N force at 0.5 MPa seats labels without crushing sleeves.
Presence checking at assembly fixtures
With a CMSG or EMSG switch on the barrel, the cylinder confirms a part is seated when the trimmed stroke completes - useful for clip or connector snap-fit verification.
Slide gate on small hopper chutes
About 94 N of working force at 0.5 MPa opens and closes a powder or granule slide gate, and the stainless barrel copes with the humid air above wash-down chutes.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X165-20S the Right Cylinder?
Bore 16 gives 100.5 N and bore 25 gives 245.3 N at the same 0.5 MPa supply - if the load sits near 10 kg, bore 20 at 157 N is the balanced pick. The -20 adjuster is an extend-side mechanical stop, not a mid-stroke lock; a dropped air line still lets the rod drift, so external blocking does the holding. Choose FA flange or LB foot mounting, with I and Y rod knuckles also offered. Across a 165 mm stroke, guide the tooling so side loads stay off the 8 mm 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 MAJ20X165-20S FAQ
Push 157.0 N and pull 131.9 N at 0.5 MPa; push 219.8 N at 0.7 MPa; theoretical maximum 32 kgf at 1.0 MPa. The port is 1/8" on the 20 mm bore, the rod is 8 mm with an M8x1.25 male thread, and the standard magnet works with CMSG, DMSG and EMSG switches.
Fixed anti-impact bumper pads decelerate the piston at both extremes. They are not adjustable air cushions - if the cycle needs cushioning plus a trimmed stroke, AirTAC's MACJ family is the related type to compare.
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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