Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 300mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke300 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S
The ACQJ40X300-75S is a double-acting, single-rod JIS compact cylinder built for specialized long-stroke applications. It features a 40 mm bore and a 300 mm stroke, exceeding the 100 mm standard maximum for this bore size, making it a made-to-order long-stroke variant. An external threaded stop with a lock nut restricts the extend end position, providing a usable extension range of 225 mm to 300 mm. The retract stroke remains completely unaffected by this adjustment.
Because the piston area is unchanged, the output force is identical to a standard ACQ of the same bore, delivering 628.3 N push and 527.8 N pull at 0.5 MPa. The unit includes a fixed NBR elastomer bumper at each end for end-of-stroke deceleration and a built-in piston magnet compatible with reed or electronic solid-state switches. It operates at 30-500 mm/s and uses a PT1/8 port alongside a Ø16 mm rod.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 300 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 ACQJ40X300-75S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×300 | 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 ACQJ40X300-75S Is Used
Machining Fixture Stops
Dial in the exact extend position within the 225-300 mm range on a CNC machining fixture to accommodate varying raw material lengths without swapping out the cylinder.
Packaging Line Diverter
Adjust the extend stop on a packaging conveyor diverter to handle different product box sizes during production changeovers directly at the machine.
Assembly Press Trials
Set trial end positions on an assembly press to find the optimal engagement distance for new components before locking the external M12x1.25 adjuster nut.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-75S the Right Cylinder?
Selecting this 40 mm bore model yields 879.6 N push at 0.7 MPa. If your application requires less force, the adjacent 32 mm bore provides 402.1 N push at 0.5 MPa; for heavier loads, the 50 mm bore offers 981.8 N push at 0.5 MPa. A fixed-stroke ACQ cylinder is sufficient if your end position never requires modification. When ordering, confirm the 40 mm bore, 300 mm full stroke, 75 mm adjustment window, the -S magnet for sensing, and the 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 ACQJ40X300-75S FAQ
The cylinder provides 628.3 N push and 527.8 N pull 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 300 mm, and the external adjuster allows the extend stroke to be shortened by up to 75 mm, yielding a usable extend range of 225-300 mm.
No, the adjuster only limits the extend stroke length, leaving the force identical to a standard ACQ of the same bore. The cylinder relies on fixed NBR elastomer bumpers at each end for deceleration; for high-speed or high-energy loads, adding an external shock absorber or slowing the approach is recommended.
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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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