Airtac MTG Stainless Steel Mini Cylinder MTG40X125S
The AirTAC Airtac MTG Stainless Steel Mini Cylinder MTG40X125S is a genuine single acting, pull (spring return) JIS-standard round-body mini air cylinder with a Ø40mm bore and 125mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel with a hard-chrome-plated rod for reliable, mildly corrosion-resistant service.
- BoreØ40 mm
- Stroke125 mm
- Port size1/8"
- Acting typeSingle acting, pull (spring return)
- Rod threadM14×1.5
- 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 MTG Stainless Steel Mini Cylinder MTG40X125S
The MTG40X125S is a JIS-standard round-body mini cylinder built as a single acting PULL unit: an internal spring holds the rod out at rest, and compressed air retracts (pulls) it through the 125 mm stroke. At the largest MTG bore of 40 mm it delivers a net pull of about 339.1 N at 0.5 MPa and 550.1 N at 0.7 MPa, already after the spring, so the figures you see are what reaches the load. Working pressure runs from 0.2 MPa (28 psi) up to 1.0 MPa (145 psi) with a 1.5 MPa (215 psi) proof rating, and speed is 50 to 800 mm/s. Because only one air line is needed, plumbing stays simple and the spring pushes the rod back out automatically on air loss.
Construction suits damp and washdown-adjacent lines: a SUS304 stainless barrel, a hard-chrome (20 um) carbon-steel rod with a male M14x1.5 thread, riveted covers and a fixed anti-impact bumper pad that softens the stroke ends. The fitted magnet (the S code) lets you mount CMSG, DMSG or EMSG switches for end-of-stroke signalling, and the 1/8" port is the same on every MTG bore. A practical sizing note: treat about 0.6 of the pull as the realistic working figure, roughly 203 N, which lifts or draws a safe vertical load of about 17 kg at 0.5 MPa.
Airtac MTG Stainless Steel Mini Cylinder MTG40X125S Technical Specifications
| Model | Airtac MTG Stainless Steel Mini Cylinder MTG40X125S |
|---|---|
| Series | MTG JIS mini cylinder |
| Bore size | Ø40 mm |
| Stroke | 125 mm |
| Acting type | Single acting, pull (spring return) |
| Port size | 1/8" |
| Rod thread | M14×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.2 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 50 – 800 mm/s |
| Cushion | Fixed anti-impact bumper pads |
| Max standard stroke | Up to 150 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 (Ø40mm)
| Pressure | Pull force (spring return) |
|---|---|
| 0.5 MPa | 339.1 N |
| 0.7 MPa | 550.1 N |
Single-acting pull: the spring extends the rod; air retracts it. Forces already net the spring; minimum working pressure is 0.2 MPa.
Model Code: Airtac MTG Stainless Steel Mini Cylinder MTG40X125S
| MTG | JIS round-body mini cylinder (single-acting pull, spring-return). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 MTG Stainless Steel Mini Cylinder MTG40X125S Is Used
Retract a locking pin
Air pulls the 16 mm rod in to withdraw a pin or latch through 125 mm; on air loss or venting, the spring pushes the pin straight back out to its locked position.
Draw a web or tape
Mount the cylinder to pull a belt, film or tape tensioner through the stroke; the 339.1 N pull at 0.5 MPa holds steady web tension with a single air line.
Close a slide or shutter
Use the pull stroke to slide a guard, chute gate or shutter closed; the spring reopens it automatically whenever air is removed, a simple fail-open arrangement.
Is the Airtac MTG Stainless Steel Mini Cylinder MTG40X125S the Right Cylinder?
Within the MTG family, bore 40 is the strongest: its 339.1 N pull at 0.5 MPa is about 2.5x the 132.6 N of the 25 mm bore, so choose MTG40X125S when your one-way draw needs serious force. If your load is light, dropping to MTG32 or MTG25 saves space and air. Remember the direction logic: the spring extends the rod and air retracts it, so the work stroke is the pull; if you need two-way powered travel or a stroke beyond the 150 mm MTG standard limit, step up to the double-acting MG series instead. Air supply must reach at least 0.2 MPa (28 psi) to overcome the spring. Mounting options are LB foot, FA flange, CB clevis and SDB pivot, with I and Y rod knuckles available; this S-coded model carries a magnet for CMSG, DMSG or EMSG position switches, and the thread is PT with G and NPT variants on request.
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 0.2 – 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 MTG Stainless Steel Mini Cylinder MTG40X125S FAQ
Net of the return spring, it pulls 339.1 N at 0.5 MPa and 550.1 N at 0.7 MPa. Because the spring must be overcome, the minimum working pressure is 0.2 MPa (28 psi); the full operating range is 0.2 to 1.0 MPa (28 to 145 psi) with a 1.5 MPa (215 psi) proof pressure. It runs on air filtered to 40 um, tolerates -20 to +70 C, and cycles at 50 to 800 mm/s with a fixed anti-impact bumper pad at each stroke end.
In the MTG the spring extends the rod to its rest position and compressed air retracts (pulls) it, so the powered stroke is the pull. The MSG is the mirror image: air pushes and the spring retracts. The MG is double acting, with air on both sides for powered two-way travel and strokes beyond the 150 mm MTG limit. On air loss the MTG40X125S spring simply pushes the rod out; it does not lock or hold a load, and the bumper pad is not a brake. The fitted magnet accepts CMSG, DMSG or EMSG switches for position feedback.
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