Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø40mm bore and 250mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ40 mm
- Full stroke250 mm
- Port sizePT1/8
- Adjuster threadM12×1.25
About the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB
The ACQJ40X250-50SB is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the EXTEND end position. You can fine-tune the usable extend range from 200 mm up to the full 250 mm directly on the machine without swapping parts. The RETRACT stroke remains completely unaffected. Because the piston area stays the same, the force is identical to a standard ACQ of this bore.
This long-stroke made-to-order variant exceeds the 100 mm standard maximum for a 40 mm bore. It delivers 628.3 N push and 527.8 N pull at 0.5 MPa, incorporates a fixed NBR elastomer bumper at each end, and features a built-in piston magnet for electronic or reed switches. The male M14x1.5 rod-end thread couples directly to your load.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø40 mm |
| Full stroke | 250 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 ACQJ40X250-50SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 ACQJ40X250-50SB Is Used
Machining Fixture Stops
Dial in the exact clamping reach on CNC milling fixtures during part-changeover without machining new stop collars.
Carton Forming Arms
Adjust the extend push-off distance for varying package sizes on packaging lines directly at the machine side.
Assembly Press Tonnage
Set precise trial end positions for pressing bearings to avoid over-travel, tuning the stroke by up to 50 mm.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-50SB the Right Cylinder?
If you do not need on-the-fly end-position tuning, a fixed-stroke ACQ40X250 cylinder is simpler and suffices. When sizing neighbours, a 32 mm bore yields 402.1 N push while a 50 mm bore provides 981.8 N push at 0.5 MPa. To order this adjustable unit correctly, confirm the 40 mm bore, 250 mm full stroke, 50 mm window, the -S magnet for sensors, and the -B male M14x1.5 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 ACQJ40X250-50SB FAQ
It provides 628.3 N push and 527.8 N pull at 0.5 MPa, and 879.6 N push at 0.7 MPa. The maximum push is 128 kgf at 1.0 MPa. The full stroke is 250 mm with a 50 mm adjustable window, giving a usable extend range of 200-250 mm. The operating pressure is 0.15-1.0 MPa.
The external M12x1.25 threaded stop with lock nut limits only the extend stroke length; it does not change the piston area, so force remains identical to a standard ACQ. Deceleration is handled by a fixed elastomer bumper, not an adjustable air cushion. A plain cylinder does not hold its load on air loss, so for fail-safe holding you must add an external rod lock or pilot-operated check valve.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
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Related AirTAC ACQJ Compact Cylinders
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