Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X80-50SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X80-50SB is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 80mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke80 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 ACQJ20X80-50SB
The ACQJ20X80-50SB is a double-acting JIS compact cylinder with an external threaded stop and lock nut that limits the extend stroke. You get a usable extend range of 30-80mm (full 80mm stroke minus up to a 50mm window), while the retract stroke remains unaffected. Because the piston area stays the same, force output is identical to a standard ACQ of this bore.
This bore 20mm unit pushes with 157.1N and pulls with 117.8N at 0.5MPa. It includes a male M8x1.25 piston rod end (-B) for direct load coupling and a built-in magnet (-S) for position sensing. The body uses fixed elastomer bumpers for end-of-stroke deceleration and features magnetic-switch grooves compatible with reed or solid-state switches.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X80-50SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X80-50SB |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 80 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 ACQJ20X80-50SB
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×80 | 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 ACQJ20X80-50SB Is Used
Machining Fixture Clamps
Dial in the exact clamping reach on a CNC milling fixture during setup, shortening the extend stroke by up to 50mm to accommodate different workpiece heights without swapping cylinders.
Product Diverters
Adjust the pusher arm extension on a packaging conveyor line to handle varying box sizes, using the external stop to set precise diverting distances on the fly.
Assembly Press Stops
Set trial end positions for pressing subcomponents in an electronics assembly machine, tweaking the stroke length via the M8x1.25 adjuster thread until the optimal insertion depth is found.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X80-50SB the Right Cylinder?
If you need slightly less push force, the adjacent bore 16mm delivers 100.5N at 0.5MPa, whereas stepping up to bore 25mm provides 245.4N. If your extend position never varies, a fixed-stroke ACQ cylinder is simpler and sufficient. When ordering this adjustable version, verify the 20mm bore, 80mm full stroke, 50mm window, -S magnet, and -B male rod thread. The standard port is M5x0.8 with PT threading.
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 ACQJ20X80-50SB FAQ
At 0.5MPa it pushes with 157.1N and pulls with 117.8N; at 0.7MPa push is 219.9N; max push is 32kgf at 1.0MPa. The full stroke is 80mm with a 50mm adjustable window, giving a usable extend range of 30-80mm. The retract stroke is unaffected, and force remains identical to a standard ACQ of this bore.
An external M8x1.25 threaded stop with a lock nut limits the extend stroke, changing only the travel length, not the force. The cylinder uses fixed elastomer bumpers, not adjustable air cushions. It does not hold loads on air loss; for fail-safe holding, install an external rod lock or pilot-operated check valve.
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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