Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 75mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke75 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B
The AirTAC ACQJ40X75-20B is a double-acting JIS compact cylinder featuring an external threaded stop with a lock nut that limits the extend end position. You can fine-tune the extend stroke on the machine without changing parts, yielding a usable extend range of 55-75mm (a 75mm full stroke minus up to the 20mm window). The retract stroke remains completely unaffected.
Because the piston area is unchanged, the force is identical to a standard ACQ of this bore, delivering 628.3N push and 527.8N pull at 0.5MPa. This unit includes a male M14x1.5 piston rod end for direct load coupling, a fixed NBR elastomer bumper at each end for end-of-stroke deceleration, and sensor grooves on the body. Note that this specific configuration ships without a magnet (-S omitted), so position sensing is not enabled out of the box.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 75 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 ACQJ40X75-20B
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 ACQJ40X75-20B Is Used
Machining Fixture Clamps
Dial in the exact clamping reach on a CNC machining fixture during setup, allowing operators to shorten the extend stroke by up to 20mm to accommodate varying part geometries without swapping hardware.
Product Changeover Stops
Adjust the end-of-stroke position on packaging line stops during rapid product changeovers, tuning the 75mm stroke down to 55mm to accept different carton sizes on the fly.
Prototype Press Positions
Establish optimal trial end positions on a laboratory press, using the external M12x1.25 adjuster to find the precise 55-75mm extension distance before finalizing the mechanical layout.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X75-20B the Right Cylinder?
When sizing this 40mm bore, note the adjacent options: stepping down to a 32mm bore yields 402.1N push at 0.5MPa, while stepping up to a 50mm bore provides 981.8N push. If your application never requires altering the end position, a fixed-stroke ACQ cylinder is simpler and sufficient. To order this adjustable version correctly, confirm the 40mm bore, 75mm full stroke, 20mm adjustment window, the male M14x1.5 rod thread (-B), and that no magnet is required.
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 ACQJ40X75-20B FAQ
The usable extend range is 55-75mm (a 75mm full stroke shortened by up to a 20mm 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 128 kgf at 1.0 MPa.
The external M12x1.25 threaded stop with lock nut limits only the extend length, leaving the retract stroke untouched; it changes stroke length but not force. The cylinder uses a fixed NBR elastomer bumper for deceleration, not an adjustable air cushion. A plain ACQ-type does not hold its load on air loss, so for a fail-safe hold you should add an external rod lock or pilot-operated check valve.
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Related AirTAC ACQJ Compact Cylinders
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