Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50 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 ACQJ40X125-50
The AirTAC ACQJ40X125-50 is a double-acting, single-rod JIS compact cylinder built for applications requiring adjustable extend end positions. It features an external M12x1.25 threaded stop with a lock nut on the rod-end side, allowing you to fine-tune the extend stroke from 75 mm up to the full 125 mm directly on the machine. The retract stroke remains completely unaffected by this adjustment. Because the piston area is unchanged, the output force is identical to a standard ACQ of this bore size.
This specific configuration is a long-stroke, made-to-order variant, as the 125 mm stroke exceeds the 100 mm standard maximum for the 40 mm bore. It delivers a push force of 628.3 N and a pull force of 527.8 N at 0.5 MPa. The cylinder body incorporates fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration rather than adjustable air cushions. While this model ships without a magnet, the body retains magnetic-switch grooves for adding sensors if needed later.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50 Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50 |
|---|---|
| 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 ACQJ40X125-50
| 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 ACQJ40X125-50 Is Used
Modular Fixture Positioning
Dial in the extend stop from 75 to 125 mm during new product-changeover setups, accommodating varying part widths without machining custom spacers or swapping cylinders.
CNC Lathe Loading Probe
Establish the exact raw bar feed length on a CNC lathe by adjusting the external stopper, allowing operators to safely test and set end positions before committing to a fixed cycle.
Carton Sealing Flap Folder
Adapt the folding arm extension on packaging equipment to different carton profiles, using the lock nut to secure the exact extend position required for consistent glue lines.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50 the Right Cylinder?
When sizing this cylinder, consider the 40 mm bore against its neighbors: a 32 mm bore provides 402.1 N push at 0.5 MPa, while a 50 mm bore yields 981.8 N. If your extend endpoint is fixed and never requires on-machine tweaking, a standard ACQ cylinder of the same bore and stroke will suffice and likely ship faster. To order correctly, confirm the 40 mm bore, 125 mm full stroke, the 50 mm adjustable window, the default female M8x1.25 rod-end thread, and the PT1/8 port. Note that a plain compact cylinder will drift and lose its load on air loss; for fail-safe holding, specify an external rod lock or pilot-operated check valve.
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 ACQJ40X125-50 FAQ
This 40 mm bore cylinder has a 125 mm full stroke with a 50 mm adjustable window, yielding a usable extend range of 75-125 mm. It provides 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. The port size is PT1/8.
No, the external M12x1.25 threaded stop alters only the extend stroke length, not the piston area, so force remains identical to a standard ACQ. Deceleration is handled by fixed NBR elastomer bumpers at both ends; for high-speed or high-energy loads, you should add an external shock absorber or slow the approach speed.
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Related AirTAC ACQJ Compact Cylinders
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