Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50SB 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 ACQJ40X125-50SB
The ACQJ40X125-50SB is a double-acting JIS compact cylinder featuring a 125mm stroke and an external extend stop. A threaded adjuster with a lock nut lets you trim the forward end position by up to 50mm, yielding a usable extend range of 75-125mm. The retract distance remains completely unaffected. Because the piston area stays the same, output force equals a standard ACQ, delivering 628.3N push and 527.8N pull at 0.5MPa.
This unit includes a male M14x1.5 rod end and an internal piston magnet for electronic or reed switches. As a long-stroke variant exceeding the 100mm standard maximum for this bore, it is produced as a made-to-order item. It retains the fixed NBR elastomer bumper at each end and operates on PT1/8 porting at speeds from 30-500mm/s.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50SB |
|---|---|
| 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 ACQJ40X125-50SB
| 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 ACQJ40X125-50SB Is Used
Machine Changeover Stops
Adapt clamping positions on a machining line instantly by dialing the extend stop between 75 and 125mm instead of swapping hardware.
Variable Carton Pushing
Accommodate different box sizes on a packaging conveyor by tweaking the forward stroke limit on the fly to prevent crushing.
Prototype Fixture Setup
Dial in trial end positions for new assembly fixtures without machining new spacers, locking the rod precisely where needed.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-50SB the Right Cylinder?
When sizing this actuator, consider the 40mm bore delivers 628.3N push at 0.5MPa, while the adjacent 32mm bore provides 402.1N and the 50mm bore yields 981.8N. If your machine never requires end-position tuning, a fixed-stroke ACQ cylinder suffices. For this adjustable model, confirm the 125mm full stroke, 50mm window, magnet, and 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 ACQJ40X125-50SB FAQ
It provides 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 full stroke is 125mm with a 50mm adjustment window, allowing an extend range of 75-125mm.
The M12x1.25 threaded stop with lock nut limits forward travel only; retract is unaffected and force is identical to a standard ACQ. The fixed NBR bumper decelerates the rod near stroke end, but the cylinder will drift on air loss, so an external rod lock is needed for fail-safe holding.
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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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