Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75SB 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 ACQJ40X125-75SB
The AirTAC ACQJ40X125-75SB is a double-acting JIS compact cylinder with a 40mm bore and a 125mm full stroke. Because this stroke exceeds the 100mm standard maximum for this bore size, it is configured as a long-stroke, made-to-order variant. It features an external M12x1.25 threaded stop with a lock nut on the rod-end side, allowing you to fine-tune the extend end position on the machine without changing parts. The usable extend range spans 50mm up to the full 125mm, while the retract stroke remains completely unaffected.
Because the piston area is unchanged, the output force is identical to a standard ACQ of this bore: 628.3N push and 527.8N pull at 0.5MPa. The unit includes a male M14x1.5 rod-end thread for direct load coupling and a built-in piston magnet (-S) that works with reed or electronic solid-state switches. It uses a fixed NBR elastomer bumper at each end for end-of-stroke deceleration rather than an adjustable air cushion.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75SB |
|---|---|
| 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 ACQJ40X125-75SB
| 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 ACQJ40X125-75SB Is Used
Product Changeover Stops
Quickly modify the extend endpoint on a packaging line when switching between different carton sizes, using the external stop to dial in the new position without replacing the cylinder.
Trial End Positions
Dial in the exact clamping depth on a machining fixture during first-article inspection, testing various extend lengths from 50mm to 125mm until the optimal contact point is found.
Setup-Varying Fixtures
Adapt a multi-model assembly station on the fly, adjusting the stroke outward or inward via the threaded stop nut to accommodate varying part widths without changing hardware.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-75SB the Right Cylinder?
If your application only needs a fixed 125mm extend, a standard ACQ40X125 avoids the external adjuster hardware. For lighter loads, the ACQJ32X125-75 delivers 402.1N push at 0.5MPa, while the ACQJ50X125-75 offers 981.8N push for heavier demands. When ordering this ACQJ40X125-75SB, confirm the 40mm bore, 125mm full stroke, 75mm adjustable window, the -S magnet for sensor grooves, and the -B male rod thread. Note that a plain cylinder does not hold 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 ACQJ40X125-75SB FAQ
The force is identical to a standard ACQ of the same bore: 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. The 75mm adjustable window allows the extend stroke to be shortened anywhere from 50mm up to the full 125mm.
An external M12x1.25 threaded stop with a lock nut limits how far the rod extends, changing only the stroke length and not the piston area or force. The retract stroke is unaffected. The cylinder uses fixed NBR elastomer bumpers at each end for deceleration rather than adjustable air cushions, so external shock absorbers are recommended for high-energy loads.
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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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