Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20B 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 ACQJ40X250-20B
The AirTAC ACQJ40X250-20B is a double-acting, single-rod JIS compact cylinder built for applications requiring precise extend-position tuning. It features a 250mm total stroke and a male M14x1.5 piston rod end that couples directly to your load. An external M12x1.25 threaded stop with a lock nut lets you shorten the forward stroke by up to 20mm, yielding a usable extend range of 230-250mm. The return stroke remains completely unaffected.
Because the adjustment mechanism only limits travel length and not the piston area, the generated force is identical to a standard ACQ of this bore. You get 628.3N of push and 527.8N of pull at 0.5MPa. This long-stroke made-to-order variant exceeds the 100mm standard maximum for this bore size. It incorporates fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration, plus pre-milled sensor grooves on the body for adding reed or solid-state switches later.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20B |
|---|---|
| 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 ACQJ40X250-20B
| 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 ACQJ40X250-20B Is Used
Product Changeover Stops
Adapt automated assembly lines to new part lengths instantly by dialing in the extend stop from 230mm up to 250mm without swapping hardware.
Calibrating Press Fits
Determine the optimal insertion depth for bearings or pins on a trial-and-error basis, locking the M12x1.25 adjuster nut once the perfect endpoint is found.
Variable Length Tamping
Adjust the tamping depth of packing materials in a cartoning machine to accommodate different fill volumes without reprogramming the motion controller.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20B the Right Cylinder?
When sizing this 40mm bore actuator, consider the neighbouring options: a 32mm bore yields 402.1N push, while a 50mm bore provides 981.8N at 0.5MPa. Choose this specific unit when your setup demands a 230-250mm forward travel with on-the-fly position adjustment. If the exact end position is permanently fixed and never changes, a standard non-adjustable ACQ cylinder will suffice. To finalize your order, confirm the 40mm bore, the 250mm full stroke, the 20mm adjustment window, the male rod thread, and whether you need the magnet option, as this unit ships without one.
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 ACQJ40X250-20B FAQ
The usable extend range is 230-250mm (250mm full stroke minus the 20mm window). The force is identical to a standard ACQ: 628.3N push and 527.8N pull at 0.5MPa, 879.6N push at 0.7MPa, and a maximum push of 128kgf at 1.0MPa.
An external M12x1.25 threaded stop and lock nut mechanically limits the forward stroke, leaving the retract stroke unaffected while keeping force constant. The fixed NBR elastomer bumper only decelerates the rod near the end of travel; it does not hold the load. For fail-safe load holding during air loss, you must add an external rod lock or pilot-operated check valve.
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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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Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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