Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100SB 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 ACQJ40X125-100SB
The ACQJ40X125-100SB is a double-acting JIS compact cylinder engineered for applications requiring variable extend end positions. It features a 40mm bore and a 125mm full stroke, operating as a made-to-order long-stroke variant that exceeds the standard 100mm maximum for this bore size. An external M12x1.25 threaded stop with a lock nut allows you to fine-tune the extend stroke on the machine itself, yielding a usable extend range of 25-125mm without changing any parts. The retract stroke remains completely unaffected by this adjustment.
Because the piston area is unchanged, output force is identical to a standard ACQ of the same bore, delivering 628.3N push and 527.8N pull at 0.5 MPa. This SB configuration includes a built-in piston magnet for electronic or reed switch sensing, plus a male M14x1.5 rod-end thread that couples directly to your load. Deceleration is handled by fixed NBR elastomer bumpers at both ends rather than adjustable air cushions, and the PT1/8 port manages the pneumatic supply.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100SB |
|---|---|
| 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 ACQJ40X125-100SB
| 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 ACQJ40X125-100SB Is Used
CNC Fixture Clamping
Dial in the exact clamping reach on machining centers during product-changeover, utilizing the 25-125mm extend window to accommodate varying part heights without fabricating new stops.
Carton Sealing Stops
Adjust the extend endpoint on packaging lines to securely seal different box formats on the fly, relying on the fixed elastomer bumpers to absorb the 30-500 mm/s operating speed.
Assembly Press Positioning
Set trial end positions for pressing or seating components precisely, leveraging the 879.6N push force at 0.7 MPa and locking the M12x1.25 adjuster nut once the ideal depth is found.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X125-100SB the Right Cylinder?
When sizing this unit, consider that the 40mm bore yields 628.3N of push force at 0.5 MPa; stepping down to a 32mm bore drops that to 402.1N, while moving up to a 50mm bore increases it to 981.8N. If your extend position never varies, a fixed-stroke ACQ cylinder is sufficient and avoids the adjuster overhang. For this SB model, confirm the 125mm full stroke, the 100mm adjustment window, the required male M14x1.5 rod thread, and the magnet for sensor tracking. Note that a standard ACQ-type does not hold its load on air loss, so an external rod lock or pilot-operated check valve is recommended for fail-safe holding.
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 ACQJ40X125-100SB FAQ
This 40mm bore cylinder provides 628.3N push and 527.8N pull at 0.5 MPa, 879.6N push at 0.7 MPa, and a maximum push of 128 kgf at 1.0 MPa. The full stroke is 125mm with a 100mm adjustment window, resulting in a usable extend range of 25-125mm.
The external M12x1.25 threaded stop and lock nut limit the extend length without altering the piston area, so force remains identical to a standard ACQ. Deceleration relies on fixed NBR elastomer bumpers at each end, not adjustable air cushions, and the retract stroke is completely unaffected.
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Related AirTAC ACQJ Compact Cylinders
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