Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20B 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 ACQJ40X70-20B
The AirTAC ACQJ40X70-20B is a double-acting JIS compact cylinder featuring an external male-threaded stop with a lock nut that restricts the EXTEND end position. You can fine-tune the usable extend stroke anywhere from 50mm up to the full 70mm directly on your equipment, while the RETRACT stroke remains fixed and unaffected. Because the piston area is unchanged, the output force is identical to a standard ACQ of the same bore.
This specific configuration includes a male-thread (M14x1.5) piston rod end for direct load coupling, a Ø16mm rod, and PT1/8 ports. It ships without a magnet, though the body retains magnetic-switch grooves for future sensing upgrades. Deceleration relies on a fixed NBR elastomer bumper at each end, not an adjustable air cushion.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20B |
|---|---|
| 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 ACQJ40X70-20B
| 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 ACQJ40X70-20B Is Used
Machining Fixture Limits
Set precise extend stops on a milling fixture to accommodate different raw casting widths without swapping out the entire cylinder assembly.
Product Changeover Stops
Quickly reposition the extend end position on a packaging line when transitioning between varying carton sizes, using the lock nut to secure the new 50-70mm range.
Trial End Positions
Dial in the exact extension point during laboratory testing equipment setup to find the optimal clamping distance before finalizing the mechanical layout.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X70-20B the Right Cylinder?
Choosing this bore yields a theoretical push force of 628.3N at 0.5MPa. Stepping down to a 32mm bore drops the push to 402.1N, whereas moving up to a 50mm bore increases it to 981.8N. If your application never requires varying the end position, a fixed-stroke ACQ40X70 will achieve the same thrust. When ordering, confirm the 40mm bore, 70mm full stroke, 20mm adjuster window, the male rod thread, and that no magnet (-S) is required.
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 ACQJ40X70-20B FAQ
This 40mm bore 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. The maximum push force is 128kgf at 1.0MPa. The full stroke is 70mm, but the external M12x1.25 adjuster allows the extend stroke to be shortened by up to 20mm, giving a usable extend range of 50-70mm.
No, the external threaded stop only changes the extend stroke length, meaning the force remains identical to a standard ACQ. Deceleration is handled by a fixed elastomer bumper at each end, not an adjustable air cushion. Note that a plain cylinder will not hold a load on air loss; for fail-safe holding, an external rod lock or pilot-operated check valve 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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