Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-40S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-40S 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 ACQJ40X125-40S
The ACQJ40X125-40S is a double-acting JIS compact cylinder featuring a 125mm stroke and an integrated piston magnet (-S). It is a long-stroke made-to-order variant, exceeding the standard 100mm maximum for this 40mm bore. An external M12x1.25 threaded stop with a lock nut allows you to fine-tune the extend end position on the machine, yielding a usable extension range of 85-125mm without swapping parts.
Because the adjuster only limits travel length, the piston area remains intact, delivering force identical to a standard ACQ. The retract stroke stays completely unaffected. Operating at 0.15-1.0 MPa with a PT1/8 port, it pushes 628.3N and pulls 527.8N at 0.5 MPa. Fixed NBR elastomer bumpers absorb impact at both ends, and the built-in magnet supports reed or solid-state switches.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-40S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-40S |
|---|---|
| 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 ACQJ40X125-40S
| 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 ACQJ40X125-40S Is Used
Machine Tending Setup
Dial in the exact extend stop during initial commissioning of an automated lathe to accommodate varying raw part lengths without machining new spacers.
Product Changeover Stops
Rapidly reposition the extension limit on a packaging line when switching between different carton depths, utilizing the 40mm adjustment window.
Prototype End Positions
Safely trial different extend endpoints on a test fixture to find the optimal kinematic motion before finalizing the mechanical design.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-40S the Right Cylinder?
When sizing this unit, stepping down to a 32mm bore yields a 402.1N push at 0.5 MPa, while stepping up to a 50mm bore provides 981.8N. If your equipment never requires end-position adjustments, a fixed-stroke ACQ cylinder will suffice. To order, confirm the 40mm bore, 125mm full stroke, 40mm adjustment window, the required -S magnet for sensors, and the default 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 ACQJ40X125-40S FAQ
This 40mm bore cylinder provides a push force of 628.3N and a pull force of 527.8N at 0.5MPa, with a push of 879.6N at 0.7MPa and a maximum push of 128kgf at 1.0MPa. The full stroke is 125mm, and the adjustable window is 40mm, giving a usable extend range of 85-125mm.
An external M12x1.25 threaded stop and lock nut mechanically limits the extension length, leaving the retract stroke unaffected. Force remains identical to a standard ACQ because the piston area is unchanged. The cylinder uses fixed elastomer bumpers, not a brake, so it will not hold a load on air loss; use an external rod lock for fail-safe holding.
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Related AirTAC ACQJ Compact Cylinders
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