Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 40mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke40 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 ACQJ20X40-20SB
The AirTAC ACQJ20X40-20SB is a double-acting JIS compact cylinder featuring an external threaded stop and lock nut that restricts the extend stroke. You can tune the usable extend range from 20 mm up to the full 40 mm directly on the machine, while the retract stroke remains completely unaffected. Because the piston area stays constant, output force is identical to a standard ACQ of this bore.
At 0.5 MPa it yields 157.1 N of push and 117.8 N of pull, rising to 219.9 N at 0.7 MPa. The body uses fixed elastomer bumpers for end-of-stroke deceleration rather than adjustable air cushions. This SB configuration includes a male M8x1.25 rod end and a built-in piston magnet compatible with reed or solid-state switches.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 40 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 ACQJ20X40-20SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×40 | 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 ACQJ20X40-20SB Is Used
Machining Fixture Tuning
Dial in the exact clamping reach on a CNC fixture during prototype runs without fabricating custom spacers for every part revision.
Product Changeover Stops
Reposition the extend end stop on packaging lines to accommodate different carton lengths rapidly using the external lock nut.
Trial End Positions
Find the optimal probe contact depth on test machinery by adjusting the extend travel from 20 to 40 mm until the exact sensing distance is achieved.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X40-20SB the Right Cylinder?
If you need less thrust, stepping down to a bore 16 unit provides 100.5 N push at 0.5 MPa, whereas moving up to a bore 25 model offers 245.4 N. If your end position never varies, a fixed-stroke ACQ cylinder is the simpler choice. When ordering this adjustable variant, verify the 20 mm bore, 40 mm full stroke, 20 mm adjuster window, male M8x1.25 rod thread, and the required S magnet for sensing.
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 ACQJ20X40-20SB FAQ
It provides 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. The full stroke is 40 mm with a 20 mm adjustment window, allowing a usable extend range of 20-40 mm.
An external M8x1.25 threaded stop with a lock nut limits how far the rod extends, shortening the stroke length only. The force remains identical to a standard ACQ because the piston area is unchanged. The retract stroke and fixed elastomer bumpers are unaffected by the adjuster.
Authorized Export Seller
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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