Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20 is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 70mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke70 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20
The AirTAC ACQJ40X70-20 is a double-acting JIS compact cylinder featuring an external threaded stop with a lock nut on the rod-end side. This mechanism limits the extend travel, allowing you to fine-tune the usable extend range from 50 up to 70mm directly on the machine without swapping parts. The retract stroke remains completely unaffected by this adjustment.
Because the piston area stays the same, the output force is identical to a standard ACQ of this bore, delivering 628.3N push and 527.8N pull at 0.5MPa. The cylinder body incorporates fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration rather than adjustable air cushions. It also features integrated magnetic-switch grooves, though this specific configuration ships without the magnet.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20 Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20 |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 70 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 ACQJ40X70-20
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×70 | 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 ACQJ40X70-20 Is Used
Machining Fixture Stops
Dial in the exact clamping extension on a CNC lathe fixture during initial setup, using the external stop to prevent over-travel into the chuck jaws.
Product Changeover Diverters
Quickly reposition a pneumatic diverter gate on a packaging conveyor to handle a new carton width by turning the adjuster nut rather than replacing hardware.
Assembly Press Trial Positions
Test different pressing depths for a bearing insertion station by adjusting the extend end-point within the 50-70mm window before finalizing the cycle.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20 the Right Cylinder?
When sizing this actuator, consider the neighbouring bores: a 32mm version provides 402.1N push at 0.5MPa, while a 50mm bore yields 981.8N, giving you clear scaling options if 628.3N is slightly too high or low for your fixture. If your application requires a fixed end position that never varies, a standard ACQ cylinder will suffice and saves the adjustment step. To order this adjustable model correctly, confirm the 40mm bore, 70mm full stroke, 20mm window, female M8x1.25 rod-end thread, and whether you need the S magnet suffix for position sensing.
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 ACQJ40X70-20 FAQ
The usable extend range is 50-70mm (a 70mm full stroke minus the 20mm window). It generates 628.3N push and 527.8N pull at 0.5MPa, 879.6N push at 0.7MPa, and a maximum push of 128kgf at 1.0MPa. The port size is PT1/8 and the external adjuster thread is M12x1.25.
No, the threaded stop only changes the extend stroke length, so the force remains identical to a standard ACQ. The cylinder uses fixed NBR elastomer bumpers for deceleration, not an adjustable air cushion or load-holding brake. For fail-safe load holding on air loss, an external rod lock is required.
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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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