Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20S
The AirTAC Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20S 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 ACQJ40X250-20S
The AirTAC ACQJ40X250-20S is a double-acting, single-rod JIS compact cylinder engineered for on-machine extend-position tuning. An external M12x1.25 threaded stop with a lock nut limits the outward stroke, providing a usable extension range of 230 to 250 mm. Because the piston area remains constant, output force stays identical to a standard ACQ of this bore. This 250 mm unit is a long-stroke, made-to-order variant, exceeding the 100 mm standard maximum for 40 mm bores while retaining the fixed elastomer bumper at each end.
The retract stroke remains unaffected by the external adjuster. Equipped with a built-in magnet (-S), the body accepts both reed and electronic solid-state switches via its integrated grooves. Operating pressure spans 0.15 to 1.0 MPa, and the PT1/8 porting pairs with a 16 mm piston rod featuring a default M8x1.25 female thread end.
Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20S Technical Specifications
| Model | Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20S |
|---|---|
| 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 ACQJ40X250-20S
| 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 ACQJ40X250-20S Is Used
Machining Fixture Stops
Dial in the exact 230-250 mm extend position on a CNC machining fixture during part-changeover without swapping out the entire cylinder body.
Conveyor Diverting Arms
Adjust the reach of a conveyor diverting mechanism on the fly to accommodate varying package widths on a packaging line.
Material Pressing Jigs
Fine-tune the downward pressing depth of an assembly jig to test different material thicknesses without reprogramming machine controls.
Is the Airtac ACQJ32~40 Adjustable Thin-Type Cylinder ACQJ40X250-20S the Right Cylinder?
When sizing this 40 mm bore, dropping to a 32 mm bore yields a 402.1 N push at 0.5 MPa, while stepping up to a 50 mm bore provides 981.8 N. If your application never requires altering the end position, a fixed-stroke ACQ cylinder is sufficient. For ordering, confirm the 40 mm bore, 250 mm full stroke, 20 mm adjustment window, the -S magnet option, and the female rod thread. Note that a plain ACQ-type cylinder will not hold a load on air loss; for fail-safe holding, specify an external rod lock or pilot-operated check valve.
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 ACQJ40X250-20S FAQ
The push force is 628.3 N and pull is 527.8 N at 0.5 MPa, with a push of 879.6 N at 0.7 MPa and a maximum push of 128 kgf at 1.0 MPa. The usable extend range is 230-250 mm (250 mm full stroke minus up to 20 mm via the adjuster), and the retract stroke is unaffected.
The external M12x1.25 threaded stop with lock nut physically limits how far the rod extends, shortening the outward stroke only. It does not change the piston area, so force remains identical to a standard ACQ. Deceleration is handled by a fixed NBR elastomer bumper at each end, not an adjustable air cushion; for high-speed or high-energy loads, add an external shock absorber.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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Related AirTAC ACQJ Compact Cylinders
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