Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-75SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-75SB 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 ACQJ40X250-75SB
The AirTAC ACQJ40X250-75SB is a double-acting JIS compact cylinder with a 40mm bore and a 250mm total stroke. Because this length exceeds the 100mm standard maximum for this bore size, it is supplied as a long-stroke, made-to-order variant. An external threaded stop with a lock nut limits the extend end position, giving you an on-machine usable extend range of 175-250mm. The retract stroke remains completely unaffected by this adjustment.
Force output is identical to a standard ACQ of the same bore, as the adjuster changes stroke length only, not piston area. This unit includes a male M14x1.5 rod-end thread for direct load coupling and a built-in piston magnet for position sensing. It uses fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration rather than an adjustable air cushion.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-75SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-75SB |
|---|---|
| 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 ACQJ40X250-75SB
| 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 ACQJ40X250-75SB Is Used
Product Changeover Stops
Dial in new extend end positions on machining centers during product family changeovers without machining new spacers or swapping cylinder bodies.
Variable Package Diverter
Adjust the pusher extension depth on packaging lines to handle varying carton widths while keeping the retraction timing constant.
Assembly Press Tuning
Fine-tune the engagement depth of pressing operations on automated assembly equipment during setup or tooling trials.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-75SB the Right Cylinder?
This 40mm bore yields 628.3N push and 527.8N pull at 0.5MPa. If your application requires less force, the next size down is a 32mm bore providing 402.1N push, while stepping up to a 50mm bore yields 981.8N push. A fixed-stroke ACQ cylinder suffices if the extend end position never needs tuning. When ordering, confirm the 40mm bore, 250mm full stroke, 75mm adjustment window, the S magnet option, and the B male rod 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 ACQJ40X250-75SB FAQ
The usable extend range is 175-250mm, achieved by shortening the 250mm full stroke by up to the 75mm window. 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 with a lock nut mechanically limits the extend stroke, leaving the retract stroke unaffected. The fixed elastomer bumpers decelerate the rod near stroke ends. A plain cylinder does not hold its load on air loss; for fail-safe holding, use an external rod lock or pilot-operated check valve.
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Covers non-human-caused product damage.
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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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