Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20B 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 ACQJ40X125-20B
The ACQJ40X125-20B is a double-acting JIS compact cylinder featuring a 125mm stroke and a male-thread piston rod (M14x1.5) for direct load coupling. As a long-stroke made-to-order variant, it exceeds the standard 100mm maximum for this 40mm bore. An external M12x1.25 threaded stop and lock nut limits the extend end position, providing a usable extend range of 105 to 125mm without changing parts.
Because the adjuster alters stroke length only, the piston area remains unchanged, delivering force identical to a standard ACQ. You get 628.3N push and 527.8N pull at 0.5MPa. The body incorporates sensor grooves for reed or solid-state switches, though this specific SKU ships without a magnet. Deceleration relies on fixed NBR elastomer bumpers at both ends rather than adjustable air cushions.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20B |
|---|---|
| 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 ACQJ40X125-20B
| 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 ACQJ40X125-20B Is Used
Machining Fixture Clamps
Dial in the exact clamping reach on a CNC mill fixture between 105 and 125mm to accommodate raw casting variations without machining new spacer blocks.
Packaging Line Changeovers
Rapidly adjust the extend endpoint on a carton forming station during product format changes, using the external stop to set new box depths quickly.
Press Pin Depth Setup
Establish trial insertion depths for press-fitting dowel pins on an assembly rig, fine-tuning the extend stop to prevent over-travel before locking the nut.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20B the Right Cylinder?
When sizing this unit, stepping down to a 32mm bore drops the 0.5MPa push force to 402.1N, while moving up to a 50mm bore raises it to 981.8N. If your application never requires end-position tuning, a fixed-stroke ACQ cylinder will suffice. For ordering, confirm the 40mm bore, 125mm full stroke, 20mm adjuster window, PT1/8 porting, and the male M14x1.5 rod thread. Add the -S option if you require a magnet for electronic or reed sensor activation.
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 ACQJ40X125-20B FAQ
This 40mm bore cylinder delivers a push force of 628.3N and a pull force of 527.8N at 0.5MPa, with a push of 879.6N at 0.7MPa and a maximum push of 128kgf at 1.0MPa. The usable extend range is 105 to 125mm, achieved by shortening the 125mm full stroke by up to the 20mm adjustment window.
The external M12x1.25 threaded stop with lock nut mechanically limits the extend length, while the retract stroke remains unaffected. Force is identical to a standard ACQ because the piston area is unchanged. The cylinder uses fixed elastomer bumpers rather than adjustable air cushions, and it will not hold a load on air loss; for fail-safe holding, install an external rod lock or pilot-operated check valve.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Related AirTAC ACQJ Compact Cylinders
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