Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20SB 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 ACQJ40X125-20SB
The ACQJ40X125-20SB is a double-acting JIS compact cylinder with a 125 mm stroke that exceeds the standard 100 mm maximum for this bore, making it a long-stroke made-to-order variant. It includes a male M14x1.5 piston rod end (-B) and a built-in piston magnet (-S) for position sensing. An external M12x1.25 threaded stop and lock nut restricts the extend end position, yielding a usable extend range of 105-125 mm. The retract stroke remains completely unaffected by this mechanism.
Because the piston area is unchanged, the output force is identical to a standard ACQ of the same bore: 628.3 N push and 527.8 N pull at 0.5 MPa, reaching 879.6 N push at 0.7 MPa. The unit relies on a fixed NBR elastomer bumper at each end for deceleration rather than an adjustable air cushion. Sensor grooves accommodate reed or solid-state electronic switches, and the standard PT1/8 port handles the air supply.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20SB |
|---|---|
| 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 ACQJ40X125-20SB
| 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 ACQJ40X125-20SB Is Used
Machining Fixture Tuning
Dial in the exact clamping extension on a CNC machining fixture during setup, allowing 105 to 125 mm of travel to accommodate varying part tolerances without swapping hardware.
Packaging Changeover Stops
Adjust the pusher end position on a packaging line for different carton sizes, using the external stop to quickly switch between product runs.
Assembly Press Trials
Test and set precise pressing depths on an automated assembly press, tweaking the extend limit on the machine until the optimal insertion force is achieved.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-20SB the Right Cylinder?
If your application requires less force, the adjacent ACQJ32 bore provides 402.1 N push at 0.5 MPa, whereas stepping up to an ACQJ50 yields 981.8 N push. For fixed end positions without any on-machine tuning, a standard ACQ cylinder is sufficient. When ordering this adjustable model, confirm the 40 mm bore, 125 mm full stroke, 20 mm adjustment window, male rod thread, and magnet options to ensure compatibility.
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 ACQJ40X125-20SB FAQ
This cylinder provides 628.3 N push and 527.8 N pull at 0.5 MPa, and 879.6 N push at 0.7 MPa, with a maximum push of 128 kgf at 1.0 MPa. The full stroke is 125 mm, but the external adjuster allows you to shorten the extend stroke by up to 20 mm, giving a usable extend range of 105-125 mm.
An external M12x1.25 threaded stop with a lock nut limits the extend length without altering the piston area, so the force remains identical to a standard ACQ. The retract stroke is unaffected. Deceleration is handled by fixed NBR elastomer bumpers at both ends, not adjustable air cushions, and the included magnet works with reed or electronic switches.
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1-Year Warranty
Covers non-human-caused product damage.
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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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