Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100 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 ACQJ40X125-100
The ACQJ40X125-100 is a double-acting JIS compact cylinder featuring a 125mm full stroke and an external threaded stop with a lock nut on the rod-end side. This mechanism lets you fine-tune the extend end position directly on the machine, providing a usable extend range of 25-125mm. The retract stroke remains completely unaffected by this adjustment. Because the piston area stays the same, the output force is identical to a standard ACQ of this bore.
This long-stroke made-to-order variant exceeds the 100mm standard maximum for a 40mm bore, reaching into the 32-100mm long-stroke range that supports up to 300mm. It incorporates a fixed NBR elastomer bumper at each end for end-of-stroke deceleration rather than an adjustable air cushion. The body includes sensor grooves, though this specific configuration ships without a magnet. Operating pressure spans 0.15-1.0 MPa, and the unit uses a PT1/8 port alongside a 16mm piston rod.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100 Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100 |
|---|---|
| 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 ACQJ40X125-100
| 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 ACQJ40X125-100 Is Used
Machining Fixture Stops
Dial in the exact extend position for varying part lengths on a CNC machining fixture without swapping out physical stopper blocks.
Carton Changeover
Adjust the extend reach on the fly during packaging line product changeovers to accommodate different carton widths.
Prototype Positioning
Establish trial end positions on a test rig by threading the external stop in or out, locking the nut once the ideal motion is found.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100 the Right Cylinder?
When sizing this 40mm bore, note it yields 628.3N push and 527.8N pull at 0.5 MPa. Stepping down to a 32mm bore drops push to 402.1N, while moving up to a 50mm bore increases it to 981.8N. If your extend endpoint never varies, a fixed-stroke ACQ cylinder suffices and avoids the adjuster overhang. For this model, confirm your ordering essentials: 40mm bore, 125mm full stroke, 100mm window, female rod thread M8x1.25, and no magnet. Remember that a plain ACQ-type does not hold its load on air loss; specify an external rod lock or pilot-operated check valve if you need fail-safe holding.
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 ACQJ40X125-100 FAQ
This 40mm bore cylinder provides 628.3N push and 527.8N pull at 0.5 MPa, 879.6N push at 0.7 MPa, and a maximum push of 128 kgf at 1.0 MPa. The full stroke is 125mm with a 100mm adjustment window, yielding a usable extend range of 25-125mm.
The external M12x1.25 threaded stop with lock nut limits how far the rod extends, shortening the extend stroke without changing the piston area, so force remains identical to a standard ACQ. The retract stroke is unaffected, and fixed elastomer bumpers decelerate the piston at both ends.
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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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