Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X45-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X45-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø20mm bore and 45mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ20 mm
- Stroke45 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 MAJ20X45-20S
Small pushers that must adapt to product changeovers suit the MAJ20X45-20S well: a 45 mm extend stroke that the external stop screw shortens by up to 20 mm, cutting travel almost in half without plumbing changes. Double acting, it delivers 157 N push and 131.9 N pull at 0.5 MPa inside a 0.15-1.0 MPa (22-145 psi) envelope, moving at 30-800 mm/s.
The body is a stainless round tube rolled onto aluminium covers - no tie rods to loosen, no profile edges to trap grime - with a 20 um hard-chrome plated rod resisting corrosion in damp corners. About 94 N of the 157 N rating is a realistic working push at 0.5 MPa, enough to lift roughly 8 kg vertically with a 2:1 margin. The standard-built magnet pairs with CMSG, DMSG or EMSG switches for end-of-stroke signals.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X45-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X45-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 45 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 MAJ20X45-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×45 | 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 MAJ20X45-20S Is Used
PCB push-off from reflow pallet
Ejects cooled boards from a pallet nest; the 20 mm window matches nests of different thickness on a single station.
Coffee pack hopper gate
Opens a gravity hopper gate once per cycle; the stainless barrel tolerates the humid air near the grinder.
Carton lane kicker
Side-kicks small cartons between conveyor lanes, with bumper-padded ends preventing carton bounce even near the 800 mm/s top speed.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X45-20S the Right Cylinder?
Below it, the 16 mm bore handles 100.5 N at 0.5 MPa; above, the 25 mm bore handles 245.3 N, so move up if the payload approaches the 8 kg class. The 20 mm adjuster is a mechanical end stop on the extend side only - drift still occurs on air loss - so add a separate locking device if the load must stay parked. FA or LB mounting, I or Y rod knuckles, and ports are 1/8". Fixed bumper pads soften each end of the shortened stroke.
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 MAJ20X45-20S FAQ
At 0.5 MPa the MAJ20X45-20S pushes 157 N and pulls 131.9 N; at 0.7 MPa that becomes 219.8 N push and 184.7 N pull; theoretical maximum is 32 kgf at 1.0 MPa. Pressure range is 0.15-1.0 MPa (22-145 psi) with 1.5 MPa (215 psi) proof pressure.
A fixed anti-impact pad on each end cushions deceleration, so light loads stop softly. It is not an adjustable air cushion - for that capability see the MACJ series, which combines stroke adjustment with cushions on the same MA body concept.
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 MAJ20X45-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.