Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 20mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke20 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B
The AirTAC ACQJ40X20-20B is a double-acting JIS compact cylinder featuring a 40mm bore and a 20mm full stroke. An external threaded stop with a lock nut limits the extend end position, providing a usable extend range of 0-20mm. The retract stroke remains completely unaffected by this mechanism. A male M14x1.5 rod-end thread is included for direct load coupling.
Because the piston area is unchanged, output force is identical to a standard ACQ of this bore. The cylinder uses a fixed elastomer bumper at each end for end-of-stroke deceleration and operates at speeds from 30 to 500 mm/s. Although this specific unit ships without a magnet, the body retains magnetic-switch grooves for optional sensing retrofits.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 20 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 ACQJ40X20-20B
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 ACQJ40X20-20B Is Used
Machining Fixture Stops
Dial in the exact clamping reach on a CNC machining center during initial setup without machining custom spacers.
Product Changeover Guides
Quickly reposition the extend end stop on a packaging line when switching between different carton sizes.
Prototype End Positions
Test various extend lengths on a laboratory assembly rig to find the optimal pushing distance before finalizing the design.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X20-20B the Right Cylinder?
When sizing this 40mm bore unit, it delivers 628.3N of push force at 0.5MPa. Stepping down to a 32mm bore yields 402.1N, while stepping up to a 50mm bore provides 981.8N. A fixed-stroke ACQ is sufficient if your extend position never requires adjustment. To order, confirm the 40mm bore, 20mm full stroke, 20mm adjustable window, the male M14x1.5 rod thread, and the absence of the S magnet option.
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 ACQJ40X20-20B FAQ
The push force is 628.3N and pull force is 527.8N at 0.5MPa, with a push force of 879.6N at 0.7MPa and a maximum push of 128kgf at 1.0MPa. The full stroke is 20mm with a 20mm adjustable window, yielding a usable extend range of 0-20mm. The external adjuster has an M12x1.25 thread.
The external stop shortens the extend stroke length only, meaning force remains identical to a standard ACQ. Deceleration relies on a fixed elastomer bumper, not an adjustable air cushion. This cylinder does not hold loads on air loss; use an external rod lock for fail-safe holding.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
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Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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