Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20S 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 ACQJ40X125-20S
The ACQJ40X125-20S is a double-acting JIS compact cylinder featuring an external threaded stop and lock nut to fine-tune the extend end position. This long-stroke made-to-order variant provides a full 125 mm stroke, allowing you to shorten the forward travel by up to 20 mm directly on the machine for a usable extend range of 105-125 mm. The retract stroke remains completely unaffected.
Because the adjuster only limits travel length, the piston area stays the same, meaning force is identical to a standard ACQ of this bore. The 40 mm bore delivers 628.3 N push and 527.8 N pull at 0.5 MPa. It features a 16 mm rod, an M8x1.25 female rod-end thread, a PT1/8 port, and fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20S |
|---|---|
| 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 ACQJ40X125-20S
| 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 ACQJ40X125-20S Is Used
Machining Fixture Stops
Dial in the exact clamping reach on a CNC machining center during setup, shortening the extend stroke within the 105-125 mm window to accommodate different raw part lengths without swapping hardware.
Packaging Changeover
Adjust the product pusher end position on a packaging line to handle varying carton depths, using the external stop to rapidly switch between product runs.
Assembly Press Positioning
Set precise trial end positions for pressing bearings on an assembly station, tweaking the forward travel by up to 20 mm to test insertion depths before finalizing the machine program.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20S the Right Cylinder?
When sizing this actuator, stepping down to a 32 mm bore drops the 0.5 MPa push force to 402.1 N, while moving up to a 50 mm bore raises it to 981.8 N. Choose this specific 125 mm version only when your machine requires a forward travel exceeding the 100 mm standard maximum for a 40 mm bore. If you do not need on-machine end-position tuning, a fixed-stroke ACQ cylinder will suffice. To order, confirm the 40 mm bore, 125 mm full stroke, 20 mm adjustable window, the S magnet option, and your required rod-end thread.
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 ACQJ40X125-20S FAQ
This 40 mm bore cylinder delivers a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa, 879.6 N push at 0.7 MPa, and a maximum push of 128 kgf at 1.0 MPa. The full stroke is 125 mm, and with the 20 mm adjustable window, the usable extend range is 105-125 mm.
The external M12x1.25 threaded stop with a lock nut limits the extend travel without changing the piston area, so force remains identical to a standard ACQ. The cylinder uses fixed NBR elastomer bumpers for deceleration, not adjustable air cushions. Note that a plain compact cylinder does not hold its load on air loss; for fail-safe holding, install an external rod lock or pilot-operated check valve.
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Related AirTAC ACQJ Compact Cylinders
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