Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 125mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke125 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20
The ACQJ40X125-20 is a double-acting JIS compact cylinder featuring an external threaded stop with a lock nut that limits the extend end position. You can fine-tune the usable extend range from 105 mm up to the full 125 mm stroke directly on your equipment without swapping parts, while the retract stroke remains completely unaffected. This 125 mm stroke is a made-to-order long-stroke variant, exceeding the 100 mm standard maximum for this 40 mm bore.
Because the adjuster only alters stroke length and not the piston area, the output force stays identical to a standard ACQ of the same size. Operating pressure runs from 0.15 to 1.0 MPa, and the body incorporates fixed elastomer NBR bumpers at each end rather than adjustable air cushions. This specific configuration ships without a magnet, although the cylinder body retains magnetic-switch grooves for adding sensors later.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 125 mm |
| Adjuster thread | M12×1.25 |
| Port size | PT1/8 |
| 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 – 500 mm/s |
| Rod thread | M8×1.25 (F) / M14×1.5 (B) |
Specifications follow the official AirTAC ACQJ datasheet. The adjustable stop shortens the EXTEND stroke only; the piston area — and therefore the force — is the same as a standard ACQ of this bore. Adjustable window options: 10/20/30/40/50/75/100 mm.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Force equals a standard ACQ of the same bore — the adjuster changes stroke length, not piston area. Actual usable force is lower due to friction; size with a safety margin.
Model Code: Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | Full stroke length in mm. |
| -0 | Adjustable window in mm (extend stroke can be shortened by up to this). |
| S / B | Magnet (S) / male-thread rod (B); omit for none / female thread. |
Thread: PT standard (G / NPT available). Related: ACQ (fixed stroke), ACQD (double rod), TACQ (guided / non-rotating).
Where the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 Is Used
Machining Fixture Stops
Dial in the extend stroke from 105 to 125 mm on CNC machining fixtures to accommodate varying raw material lengths without machining custom spacers.
Packaging Changeover
Rapidly adjust the end position during packaging line product changeovers, using the external M12x1.25 stop to set precise reject or sorting arm extensions.
Assembly Press Positioning
Establish trial end positions on electronic assembly presses, tweaking the extend stroke by up to 20 mm to find the optimal pressing depth before locking the nut.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 the Right Cylinder?
When sizing this actuator, consider the neighbouring bores: a 32 mm bore yields 402.1 N push at 0.5 MPa, whereas a 50 mm bore provides 981.8 N. This 40 mm bore generates 628.3 N push and 527.8 N pull at 0.5 MPa, with a maximum push capacity of 128 kgf at 1.0 MPa. If your application never requires end-position tuning, a fixed-stroke ACQ cylinder will suffice. To order this adjustable version, confirm the 40 mm bore, 125 mm full stroke, 20 mm adjuster window, the female M8x1.25 rod-end thread, and the PT1/8 port size.
Quick checklist
- ✓ Need on-machine end-position tuning?
- ✓ Full stroke and adjust window (mm)
- ✓ Force at your working pressure
- ✓ Magnet (S) for sensors?
- ✓ Female (blank) or male (B) rod thread
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Lock the adjuster nut after setting the stop.
- check The stop limits the EXTEND stroke only.
- check Avoid side load on the short piston rod.
- check Installation by qualified personnel per AirTAC docs.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20 FAQ
This cylinder delivers a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa, with a push force of 879.6 N at 0.7 MPa. The maximum push force is 128 kgf at 1.0 MPa. The usable extend range is 105-125 mm, created by a 20 mm adjustment window subtracted from the 125 mm full stroke.
The external M12x1.25 threaded stop and lock nut mechanically limits the extend distance without altering the piston area, meaning force remains identical to a standard ACQ. Deceleration relies on fixed elastomer bumpers, not adjustable air cushions. Because it is a pneumatic cylinder, the rod will drift on air loss or a centered valve, so an external rod lock or pilot-operated check valve is required for fail-safe load holding.
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Related AirTAC ACQJ Compact Cylinders
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