Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-20B 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 ACQJ40X300-20B
The ACQJ40X300-20B is a double-acting, single-rod JIS compact cylinder configured as a long-stroke, made-to-order variant. It features an external threaded stop with a lock nut on the rod-end side that limits how far the rod extends. You can fine-tune the extend end position on the machine without changing parts, providing a usable extend range of 280-300mm (the 300mm full stroke minus up to the 20mm window). The retract stroke remains unaffected.
Because the piston area is unchanged, the output force is identical to a standard ACQ of this 40mm bore, delivering 628.3N push and 527.8N pull at 0.5MPa. This unit includes a male M14x1.5 rod-end thread (-B) that couples directly to the load, and uses a PT1/8 port. It relies on a fixed NBR elastomer bumper at each end for deceleration rather than an adjustable air cushion, and ships without a magnet (-S omitted), though the body retains sensor grooves for adding solid-state or reed switches if needed later.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-20B |
|---|---|
| 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 ACQJ40X300-20B
| 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 ACQJ40X300-20B Is Used
Long-Reach Machining Stops
Dial in the exact extend position of a 300mm stroke clamping arm on a CNC mill, using the 20mm external stop window to compensate for varying fixture heights without remachining parts.
Product Changeover Diverters
Adjust the extend limit of a sorting gate on a packaging line by up to 20mm to handle different carton widths, relying on the fixed NBR bumper to absorb the impact at high cycle rates.
Extended Stroke Assembly Presses
Set trial end positions for a long-reach pressing operation, utilizing the 628.3N push force at 0.5MPa and backing off the stroke slightly via the M12x1.25 adjuster thread to prevent over-travel.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X300-20B the Right Cylinder?
Selecting this model involves verifying that a 280-300mm adjustable extend stroke meets your layout, noting that a fixed 300mm standard ACQ suffices if exact end-position tuning is unnecessary. For sizing context, stepping down to a 32mm bore yields 402.1N push at 0.5MPa, while stepping up to a 50mm bore provides 981.8N push at 0.5MPa. When ordering, confirm the 40mm bore, 300mm full stroke, 20mm window, the male rod thread (-B), and the absence of a magnet. Remember that a plain compact cylinder does not hold its load on air loss; for a fail-safe hold, specify an external rod lock or pilot-operated check valve.
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 ACQJ40X300-20B FAQ
This cylinder provides a push force of 628.3N and a pull force of 527.8N at 0.5MPa, and 879.6N push at 0.7MPa, with a maximum push of 128kgf at 1.0MPa. The usable extend range is 280-300mm, achieved by shortening the 300mm full stroke by up to the 20mm window.
The external M12x1.25 threaded stop with a lock nut limits the extend stroke length only; it does not alter piston area, so force remains identical to a standard ACQ. The cylinder uses fixed elastomer bumpers at both ends rather than adjustable air cushions, and the retract stroke is completely unaffected by the extend adjuster.
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Related AirTAC ACQJ Compact Cylinders
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