Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 125mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke125 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S
The ACQJ40X125-75S is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend end position. You can fine-tune the usable extend range from 50 mm up to the full 125 mm directly on your machine without swapping parts. The retract stroke remains completely unaffected by this adjustment. Because the piston area stays constant, the output force is identical to a standard ACQ of the same bore.
This made-to-order long-stroke variant exceeds the 100 mm standard maximum for the 40 mm bore. It delivers 628.3 N of push force at 0.5 MPa and features a 16 mm piston rod with a female M8x1.25 thread. The body includes fixed NBR elastomer bumpers at each end for end-of-stroke deceleration, and the built-in magnet (-S) works seamlessly with reed or electronic solid-state switches.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 125 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 ACQJ40X125-75S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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 ACQJ40X125-75S Is Used
Machining Fixture Stops
Dial in the exact extend position from 50 to 125 mm on a CNC machining fixture to accommodate varying raw material lengths without manufacturing new stop blocks.
Assembly Line Changeover
Adjust the extend endpoint on the fly during packaging line product changeovers, ensuring precise positioning for different carton sizes.
Prototype End-Position Testing
Test various extend stroke endpoints during equipment R&D to find the optimal engagement distance before finalizing a mechanical design.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75S the Right Cylinder?
Selecting this 40 mm bore provides 628.3 N of push force at 0.5 MPa. If your application requires less force, stepping down to a 32 mm bore yields 402.1 N, while moving up to a 50 mm bore offers 981.8 N. If exact end-position tuning is unnecessary, a fixed-stroke ACQ cylinder will suffice. When ordering, confirm the 40 mm bore, 125 mm full stroke, 75 mm adjuster window, the -S magnet option, 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 ACQJ40X125-75S FAQ
This cylinder has a 40 mm bore and a 125 mm full stroke. The adjustable window is 75 mm, giving a usable extend range of 50 to 125 mm. Force output is identical to a standard ACQ: 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.
An external M12x1.25 threaded stop with a lock nut limits the extend stroke length without changing the piston area, meaning force remains unchanged. The retract stroke is unaffected. Fixed elastomer bumpers decelerate the rod near stroke ends, but the cylinder will not hold a load on air loss; use an external rod lock for fail-safe holding.
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1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
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Related AirTAC ACQJ Compact Cylinders
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