Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X125-40S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X125-40S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø20mm bore and 125mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ20 mm
- Stroke125 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 MAJ20X125-40S
The widest window in the bore 20 range - 40 mm - makes the MAJ20X125-40S the flexible pick for prototype cells and jigs that get re-purposed between projects; the stop screw sets any extend position from 85 mm to the full 125 mm. Double acting as standard, it pushes 157 N and pulls 131.9 N at 0.5 MPa, cycling 30-800 mm/s on 0.15-1.0 MPa (22-145 psi) air, with the position magnet already fitted for CMSG, DMSG or EMSG switches.
The build is a compact riveted round body: stainless barrel rolled into aluminium covers with a stainless block, plus a 20 um hard-chrome rod that resists corrosion in damp, food-wash or outdoor locations where painted minis rust. Fixed anti-impact pads cushion both stroke ends, though the deceleration is not adjustable, and nothing here locks the load - on air loss the piston still drifts. Plan on about 94 N of dependable working force at 0.5 MPa, enough to lift roughly 8 kg vertically with margin.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X125-40S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X125-40S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø20 mm |
| Stroke | 125 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 MAJ20X125-40S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 20 | Bore size in mm. |
| ×125 | Stroke length in mm. |
| -40 | 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 MAJ20X125-40S Is Used
Prototype cell actuation
Test rigs that change geometry weekly; the 40 mm window is re-set between builds without new hardware, backed by 157 N at 0.5 MPa.
Case ejection off a table
Pushing packed cartons from an accumulation table into a lane; 157 N at 0.5 MPa moves light cases reliably across the 30-800 mm/s range.
Height-adjust work supports
Rest pads or lift-assist posts under irregular castings, where the stop screw sets support height per part family.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ20X125-40S the Right Cylinder?
With 40 mm of trim one cylinder can replace several fixed-stroke units on a changing line. Neighbouring bores for reference: 16 mm gives 100.5 N at 0.5 MPa, 25 mm gives 245.3 N. Fit FA flange or LB foot mounts and I or Y rod knuckles as the fixture demands; the magnet is standard, so no special-order piston is needed to run switches. Over a 125 mm stroke keep the 8 mm rod out of side loading - guide the load externally or the thin rod will deflect.
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 MAJ20X125-40S FAQ
At 0.5 MPa: 157 N push, 131.9 N pull. At 0.7 MPa: 219.8 N push, 184.7 N pull. Maximum theoretical output of the 20 mm bore is 32 kgf at 1.0 MPa. Keep continuous duty near 94 N at 0.5 MPa.
Anywhere within the ordered 40 mm window: the external stop screw sets end of extend between 85 mm and the full 125 mm, and retraction stays full stroke. It is a mechanical stop, not a brake - support any suspended load independently because the rod drifts when air is lost.
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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