Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-30SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-30SB 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 ACQJ40X125-30SB
The ACQJ40X125-30SB is a double-acting, single-rod JIS compact cylinder featuring an external threaded stop with a lock nut on the rod-end side. This mechanism lets you fine-tune the extend end position directly on your machine without swapping parts. The usable extend range spans 95 to 125 mm, 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.
This specific unit is a long-stroke, made-to-order variant, as the 125 mm stroke exceeds the 100 mm standard maximum for a 40 mm bore. It includes a male-thread piston rod end (M14x1.5) for direct load coupling, a built-in piston magnet (-S) for position sensing, and fixed elastomer bumpers at both ends. Operating pressure is 0.15-1.0 MPa with a speed range of 30-500 mm/s.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-30SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-30SB |
|---|---|
| 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 ACQJ40X125-30SB
| 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 ACQJ40X125-30SB Is Used
Machining Changeover
Dial in the extend stop during product changeovers on milling fixtures, allowing rapid adaptation to different part lengths without disassembling the pneumatic setup.
Carton Sealing Stops
Set precise tucking arm end positions on packaging lines to handle varying box dimensions, using the external stop to prevent overtravel and crushing.
Bending Press Setup
Establish trial end positions on metal forming presses, tweaking the 95-125 mm extend range to find the exact bend depth before finalizing the cycle.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-30SB the Right Cylinder?
When sizing this actuator, consider the neighboring bores: stepping down to a 32 mm bore yields 402.1 N push at 0.5 MPa, while stepping up to a 50 mm bore provides 981.8 N push. If your extend position never needs on-the-fly adjustment, a fixed-stroke ACQ cylinder will suffice. For ordering, confirm the 40 mm bore, 125 mm full stroke, 30 mm adjuster window, and the S (magnet) and B (male rod) options. The R adjuster thread is M12x1.25 and the port is PT1/8.
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 ACQJ40X125-30SB FAQ
Force is identical to a standard ACQ: 628.3 N push and 527.8 N pull at 0.5 MPa, 879.6 N push at 0.7 MPa, and a maximum push of 128 kgf at 1.0 MPa. The full stroke is 125 mm with a 30 mm adjustable window, giving a usable extend range of 95-125 mm. The retract stroke is unaffected.
The external M12x1.25 threaded stop with lock nut limits only the extend length, leaving force unchanged. Deceleration is handled by fixed elastomer bumpers, not adjustable air cushions. Note that a plain compact cylinder does not hold its load on air loss; for a fail-safe hold, use an external rod lock or pilot-operated check valve.
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Related AirTAC ACQJ Compact Cylinders
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