Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB
The AirTAC Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB is a genuine double acting JIS-standard round-body mini air cylinder with a Ø25mm bore and 40mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ25 mm
- Stroke40 mm
- Port size1/8"
- Acting typeDouble acting
- Rod threadM10×1.25
- CushionFixed anti-impact bumper pads
About the Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB
With a 25 mm bore and a short 40 mm stroke, this MG delivers 245.3 N of push and 206.1 N of pull at 0.5 MPa (rising to 343.4 N at 0.7 MPa) in a double acting package that fits where full-size JIS cylinders cannot. The LB foot mount bolts straight onto standard JIS mini-cylinder foot brackets, so replacement or new design takes no re-drilling. Because the barrel is rolled from SUS304 stainless with a hard-chrome plated rod, it shrugs off washdown mist and damp workshop air that swells painted-steel minis.
Plan real work at roughly 147 N (about 15 kg of thrust) rather than the full 245.3 N rating, which keeps a healthy margin at 0.5 MPa. The fitted magnet means CMSG, DMSG or EMSG switches clip on for end-of-stroke signalling with no retrofit. Note that the fixed anti-impact bumper pad only softens the stroke ends; if air pressure drops, the rod drifts freely, so add a pilot check valve or external lock where a load must stay put.
Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB Technical Specifications
| Model | Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB |
|---|---|
| Series | MG JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| 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 MG-series (JIS standard) datasheet. Barrel: SUS304 stainless steel (round-body, riveted construction); piston rod: carbon steel with 20µm hard-chrome plating. Thread options: PT (blank) / G / NPT.
Theoretical Output Force (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB
| MG | JIS round-body mini cylinder (double-acting). |
|---|---|
| 25 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
| FA / LB / CB / SDB | Mounting: FA flange, LB foot, CB clevis, SDB pivot bracket (with CB). |
MG-family variants: MG / MGC (double acting ±cushion), MSG / MTG (single acting push / pull), MGD / MGCD (double rod ±cushion). Accessories: LB foot, FA flange, CB clevis, SDB pivot block, plus I and Y knuckles. Thread PT (blank) / G / NPT.
Where the Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB Is Used
Carton flap tucking
A 40 mm stroke matches typical flap fold travel on small carton sealers, and 245.3 N at 0.5 MPa tucks flaps without crushing the board.
Reject gate on a filling line
The built-in magnet with a CMSG switch confirms gate position each cycle, while the stainless barrel handles splash zones near the filler.
Small press fixture
About 15 kg of usable push at 0.5 MPa suits light staking or marking jigs on electronics assemblies; the LB foot keeps the fixture low and rigid.
Is the Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB the Right Cylinder?
At 0.5 MPa the 25 mm bore pushes 245.3 N; the 20 mm MG manages only 157.0 N, while stepping up to 32 mm buys 402.2 N. If your part weighs under about 15 kg and the 40 mm travel covers it, this size is the sweet spot. The -S magnet is already built in, so order a CMSG, DMSG or EMSG switch if you need position feedback. Need adjustable end-of-stroke damping for faster cycles or heavier loads? Move to the MGC series instead, and remember the plain MG will not hold position when air is lost.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting (LB / FA / CB / SDB) & knuckle
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 On first run, back off the cushion/impact settings and release gradually.
- check Installation by qualified personnel per AirTAC docs.
Airtac MG Stainless Steel Mini Air Cylinder MG25X40SLB FAQ
At 0.5 MPa it pushes 245.3 N and pulls 206.1 N; at 0.7 MPa, 343.4 N push and 288.5 N pull. The theoretical maximum is 50 kgf at 1.0 MPa. Bore is 25 mm, stroke 40 mm, rod 10 mm with M10x1.25 male thread, and ports are 1/8". Operating range is 0.15-1.0 MPa (22-145 psi) with a 1.5 MPa (215 psi) proof pressure, speed 30-800 mm/s, and temperatures from -20 to +70 C.
No. The fixed anti-impact pad only decelerates the piston at each stroke end to soften the direction change; it is not an adjustable air cushion and not a lock. With the valve centred or air off, the rod drifts under load, so fit a pilot check valve or an external rod lock for held positions. The -S magnet on this model does allow CMSG, DMSG or EMSG switches for position sensing.
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