Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 25mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke25 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S
The AirTAC ACQJ40X25-20S is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend stroke. You can fine-tune the extend end position on the machine, yielding a usable extend range of 5 to 25 mm from the 25 mm full stroke. The retract stroke remains unaffected by this adjustment. An M12x1.25 adjuster thread handles the external stop mechanism.
Because the piston area is unchanged, the force output is identical to a standard ACQ of this bore size. The 40 mm bore generates 628.3 N of push force and 527.8 N of pull force at 0.5 MPa. Fixed elastomer bumpers at both ends manage end-of-stroke deceleration, and the included -S piston magnet works with reed or electronic solid-state switches via the body grooves.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 25 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 ACQJ40X25-20S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×25 | 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 ACQJ40X25-20S Is Used
Machining Fixture Stops
Dial in the exact extend position of a clamping fixture on a CNC mill without machining new spacers for different part heights.
Product Changeover Diverter
Adjust the extend stroke on a packaging line diverter gate on the fly to accommodate varying carton widths.
Trial End Positions
Establish the optimal push depth for a press-fit assembly during prototype testing before locking the lock nut.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X25-20S the Right Cylinder?
When sizing this 40 mm bore actuator, consider the neighbouring capacities. Stepping down to a 32 mm bore drops the push force to 402.1 N at 0.5 MPa, while stepping up to a 50 mm bore increases it to 981.8 N. If your application never requires altering the extend end position, a fixed-stroke ACQ cylinder is simpler and sufficient. To order this adjustable version correctly, confirm the 40 mm bore, 25 mm full stroke, 20 mm window, the -S magnet, and the default female M8x1.25 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 ACQJ40X25-20S FAQ
At 0.5 MPa it provides 628.3 N push and 527.8 N pull force, with a push of 879.6 N at 0.7 MPa and a maximum push of 128 kgf at 1.0 MPa. The full stroke is 25 mm, the adjustable window is 20 mm, and the usable extend range is 5 to 25 mm.
No, the adjuster changes the extend stroke length only, leaving the piston area and force output identical to a standard ACQ. Deceleration is handled by fixed elastomer bumpers at each end, not an adjustable air cushion. Note that a plain compact cylinder does not hold its load on air loss; use an external rod lock for fail-safe holding.
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1-Year Warranty
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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