Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20 is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 250mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke250 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20
The ACQJ40X250-20 is a double-acting, single-rod JIS compact cylinder built for applications requiring adjustable extend end positions. It features an external threaded stop with a lock nut on the rod-end side, allowing you to fine-tune the extend stroke from 230mm up to the full 250mm directly on the machine. The retract stroke remains completely unaffected by this adjustment. This unit is a long-stroke, made-to-order variant, as the 250mm travel exceeds the 100mm standard maximum for a bore 40mm body.
Because the adjustment mechanism only limits travel distance and does not alter the piston area, the output force remains identical to a standard ACQ cylinder of this bore. At 0.5 MPa, it delivers 628.3N of push force and 527.8N of pull force. The unit uses a PT1/8 port, a 16mm piston rod, and fixed elastomer NBR bumpers at both ends to cushion impacts. While the body includes magnetic-switch grooves, this specific configuration ships without a magnet.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20 Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20 |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 250 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 ACQJ40X250-20
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 ACQJ40X250-20 Is Used
Machining Fixture Stops
Dial in the exact 230-250mm extend position for varying part lengths on a CNC lathe loader without machining new stop collars.
Product Changeover Diverters
Quickly reposition a sorting gate on a packaging line to handle different carton widths using the external M12x1.25 adjuster thread.
Assembly Press Setup
Establish trial end positions for a 250mm stroke press station, testing engagement depths before locking the nut for production runs.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20 the Right Cylinder?
When sizing this actuator, consider the force margins relative to adjacent bores. If 628.3N push at 0.5 MPa is excessive, stepping down to a bore 32 unit provides 402.1N. Conversely, if your load requires more power, a bore 50 model yields 981.8N. If your fixture never requires end-position tuning, a fixed-stroke ACQ40X250 will suffice and avoids the adjuster overhang. For ordering, confirm the 40mm bore, the 250mm full stroke, the 20mm adjustable window, and the default female M8x1.25 rod-end thread. Remember that a plain compact cylinder will not hold a load if air pressure is lost; for fail-safe holding, integrate an external rod lock.
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 ACQJ40X250-20 FAQ
This 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 usable extend range is 230-250mm, utilizing a 20mm adjustment window from the 250mm full stroke.
The external threaded stop limits only the extend stroke distance; it does not change the piston area, so force remains identical to a standard ACQ. The retract stroke is unaffected. Deceleration is handled by fixed elastomer NBR bumpers at each end, not an adjustable air cushion. Note that this model ships without a sensor magnet.
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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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