Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 50mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke50 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B
The AirTAC ACQJ40X50-20B is a double-acting JIS compact cylinder with a 50mm full stroke and a male-threaded piston rod (M14x1.5) for direct load coupling. An external M12x1.25 threaded stop and lock nut restricts the extend end position, yielding a usable extend range of 30-50mm. The retract stroke remains completely unaffected by this adjustment.
Because the adjustment mechanism only limits travel distance and not the piston area, the output force remains identical to a standard ACQ of this bore, delivering 628.3N push and 527.8N pull at 0.5 MPa. The unit integrates fixed NBR elastomer bumpers at both ends for end-of-stroke deceleration, operating reliably at speeds from 30-500 mm/s without requiring adjustable air cushions.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 50 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 ACQJ40X50-20B
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 ACQJ40X50-20B Is Used
Machining Fixture Stops
Dial in the exact clamping reach on a CNC fixture during setup, shortening the extend stroke by up to 20mm to accommodate different raw material thicknesses without swapping cylinders.
Carton Forming Turrets
Tune the folding arm extension on a packaging line during product changeovers, ensuring precise end positions for varying carton dimensions while maintaining full retract speed.
Assembly Press Positioning
Establish trial end positions for a light-duty assembly press, testing the 30-50mm extend range to find the optimal pressing depth before finalizing the mechanical stop lock nut.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X50-20B the Right Cylinder?
When sizing this 40mm bore actuator, note that a smaller 32mm bore yields 402.1N push at 0.5 MPa, while a larger 50mm bore provides 981.8N. If your end position never varies, a fixed-stroke ACQ cylinder is simpler and sufficient. For this adjustable version, confirm your ordering code includes the 40mm bore, 50mm full stroke, 20mm window, the B option for the male M14x1.5 rod end, and your required PT1/8 port fittings. This specific configuration ships without a sensor magnet, though the body retains switch grooves for adding external reed or solid-state sensors.
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 ACQJ40X50-20B FAQ
The usable extend range is 30-50mm (a 50mm full stroke minus up to 20mm via the external stop). Force is identical to a standard ACQ: 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.
An external M12x1.25 threaded stop with a lock nut limits the extend travel without altering piston area, so force is unchanged. The cylinder uses fixed elastomer bumpers for deceleration, not a brake. It will not hold a load if air pressure is lost or the valve is centered; for fail-safe holding, install an external rod lock or pilot-operated check valve.
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Related AirTAC ACQJ Compact Cylinders
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