Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 70mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke70 mm
- Port sizeM5×0.8
- Adjuster threadM8×1.25
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B
The AirTAC ACQJ20X70-20B 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 usable extend stroke from 50 mm up to the full 70 mm directly on your machinery without swapping parts. The retract stroke remains completely unaffected by this adjustment. An M8x1.25 male rod-end thread (-B) couples directly to your load.
Because the piston area stays the same, the output force is identical to a standard ACQ bore 20 cylinder, delivering 157.1 N push and 117.8 N pull at 0.5 MPa. The unit incorporates fixed elastomer bumpers at both ends for end-of-stroke deceleration rather than adjustable air cushions. It operates on M5x0.8 porting, and while the body includes magnetic-switch grooves, this specific configuration ships without a piston magnet.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 70 mm |
| Adjuster thread | M8×1.25 |
| Port size | M5×0.8 |
| 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 | M5×0.8 (F) / M8×1.25 (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 (Ø20mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 157 N | 118 N |
| 0.7 MPa | 220 N | — |
| Max (@1.0 MPa) | 32 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×70 | 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B Is Used
Machining Fixture Stops
Dial in the exact extend position from 50 to 70 mm on a CNC machining fixture to accommodate raw material thickness variations without fabricating custom stop blocks.
Packaging Diverter Arms
Adjust the extend reach of a conveyor diverter on the fly during product changeover, ensuring cartons of varying widths are pushed accurately into packing lanes.
Lab Test Probes
Set precise trial end positions for a testing probe assembly, allowing engineers to tweak the 20 mm window to find the optimal contact pressure against a sample.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B the Right Cylinder?
When sizing this 20 mm bore actuator, note it provides 157.1 N push at 0.5 MPa, sitting between the smaller 16 mm bore (100.5 N push) and larger 25 mm bore (245.4 N push). If your extend position never varies, a fixed-stroke ACQ20X70 cylinder is simpler and sufficient. To order this adjustable version correctly, confirm the 20 mm bore, 70 mm full stroke, 20 mm adjust window, the male M8x1.25 rod thread, and that no magnet (-S) 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20B FAQ
The usable extend range is 50-70 mm (70 mm full stroke minus the 20 mm window). The force is identical to a standard ACQ bore 20: 157.1 N push and 117.8 N pull at 0.5 MPa, 219.9 N push at 0.7 MPa, and a maximum push of 32 kgf at 1.0 MPa.
An M8x1.25 external threaded stop with a lock nut mechanically limits the extend stroke, changing only the stroke length while leaving force and retract unaffected. Deceleration relies on fixed elastomer bumpers, not adjustable air cushions. For fail-safe load holding on air loss, you must add an external rod lock or pilot-operated check valve, as this cylinder will drift.
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Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models are processed and dispatched in 3-5 business days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC ACQJ Compact Cylinders
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