Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-20S
The AirTAC Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-20S is a genuine double acting, adjustable stroke standard round-body mini air cylinder with a Ø40mm bore and 25mm stroke, 1/8" air ports and a stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke25 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 MAJ40X25-20S
With only 25 mm of travel but a full 40 mm bore, this MAJ40X25-20S is the pick for short, high-force moves where the extend end must land precisely - the stop screw trims the stroke by up to 20 mm on site. Expect 628.3 N of push and 527.8 N of pull at 0.5 MPa (0.15-1.0 MPa (22-145 psi) supply, 30-800 mm/s speed).
Build quality separates it from commodity minis: a riveted stainless body, a 20 um hard-chrome plated rod and grease-retaining two-way piston seals. The magnet comes installed, so CMSG, DMSG and EMSG sensors drop on for end-position checks. For sizing, the 0.5 MPa push converts to a vertical lift of about 32 kg with a 2:1 margin, or about 377 N of practical working thrust once de-rated.
Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-20S Technical Specifications
| Model | Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-20S |
|---|---|
| Series | MAJ mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 25 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 MAJ40X25-20S
| MAJ | Standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 MAJ40X25-20S Is Used
Stopper on a checkweigher conveyor
Pops up to halt cartons at the weigh station; 628.3 N push at 0.5 MPa stops full cases instantly.
Gripper clamp for bracket fixtures
Squeezes steel brackets against a nest during robotic handling; the 20 mm trim fine-tunes clamping depth.
Index dial locking pin
Locks a rotary indexing table in position between moves on a small assembly dial.
Is the Airtac MAJ Double Rod Adjustable Stainless Steel Mini Cylinder MAJ40X25-20S the Right Cylinder?
Nothing in the MAJ range out-muscles the 40 mm bore, so step down to MAJ32 (402.2 N at 0.5 MPa) or MAJ16 (100.5 N) for lighter duty. Mount by FA flange or LB foot and add an I or Y knuckle if a linkage is required; adjustable builds skip the SDB option. Treat the stop screw as an end-position setter only - on air loss the piston can still be driven back, since it is no substitute for a locking valve. With such a short stroke, rod bending is a non-issue, but alignment still matters for seal life.
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 MAJ40X25-20S FAQ
Yes. Push at 0.5 MPa is 628.3 N; pull at 0.5 MPa is 527.8 N; push at 0.7 MPa reaches 879.6 N; and theoretical maximum force is 128.1 kgf at 1.0 MPa. Rod diameter is 16 mm and the port is 1/8".
FA flange and LB foot are the standard mounts, with I and Y rod knuckles available for linkages - the adjustable version has no SDB or back-cover code. Thread options are PT (default), G or NPT on the 1/8" port.
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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