Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB 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 ACQJ20X70-50SB
The AirTAC ACQJ20X70-50SB is a double-acting JIS compact cylinder with a 70mm full stroke and an external extend stop. A threaded adjuster with a lock nut lets you set the usable extend range from 20mm up to 70mm directly on the machine. The retract distance remains fixed at the full 70mm. Because the piston area stays the same, output force is identical to a standard ACQ of this bore, delivering 157.1N push at 0.5MPa.
This model includes a built-in piston magnet (-S) for tracking with reed or solid-state switches, and a male M8x1.25 piston rod end (-B) for direct load coupling. It uses M5x0.8 ports, a 10mm rod, and fixed elastomer bumpers at both ends. Operating pressure spans 0.15 to 1.0MPa, with a speed range of 30-500mm/s.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB |
|---|---|
| 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 ACQJ20X70-50SB
| 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 ACQJ20X70-50SB Is Used
CNC Clamping Stops
Dial in the extend position from 20 to 70mm on CNC fixtures to clamp raw billets of varying lengths without swapping out cylinder bodies.
Packaging Diverter Arms
Adjust the stroke end-point on packaging conveyor lines to handle different carton widths during rapid product changeovers.
Lab Test Probes
Fine-tune the contact pressure and extension depth on laboratory testing rigs by turning the external M8x1.25 stopper nut.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB the Right Cylinder?
If you need less push force, the adjacent 16mm bore yields 100.5N push at 0.5MPa; for higher force, step up to the 25mm bore for 245.4N. Choose this 20mm bore if 157.1N push is sufficient and you require on-the-fly extend-position tuning within the 20-70mm window. If the end position never varies, a fixed-stroke ACQ cylinder is simpler. Confirm your ordering essentials: 20mm bore, 70mm full stroke, 50mm adjuster window, -S magnet, and -B male M8x1.25 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 ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-50SB FAQ
The usable extend range is 20-70mm (70mm full stroke minus the 50mm window). The retract stroke is unaffected. Force is identical to a standard ACQ: 157.1N push and 117.8N pull at 0.5MPa, 219.9N push at 0.7MPa, with a maximum push of 32kgf at 1.0MPa.
An external M8x1.25 threaded stop with a lock nut limits the extend distance only, leaving piston area and force unchanged. The cylinder uses fixed elastomer bumpers, not adjustable air cushions. It will not hold a load on air loss; use an external rod lock or pilot-operated check valve for fail-safe holding.
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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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