Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40S
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40S is a genuine double-acting COMPACT (JIS) cylinder with an EXTERNAL adjustable stop on the extend stroke — a Ø20mm bore and 50mm full stroke. Turn the stop to fine-tune the end position on the machine without changing parts.
- BoreØ20 mm
- Full stroke50 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 ACQJ20X50-40S
The AirTAC ACQJ20X50-40S is a double-acting, single-rod 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 range from 10 mm up to the full 50 mm directly on your machinery, shortening the stroke by up to 40 mm without swapping components. The retract stroke remains completely unaffected.
Because the piston area is unchanged, output force equals a standard ACQ of this bore, delivering 157.1 N push at 0.5 MPa. The unit includes a built-in magnet for electronic or reed switches, fixed elastomer bumpers at both ends, an M5x0.8 port, and a 10 mm rod with an M8x1.25 male adjuster thread.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40S Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40S |
|---|---|
| Series | ACQJ JIS compact adjustable-stroke cylinder |
| Bore size | Ø20 mm |
| Full stroke | 50 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 ACQJ20X50-40S
| ACQJ | JIS compact double-acting ADJUSTABLE-STROKE cylinder series. |
|---|---|
| 20 | Bore size in mm. |
| ×50 | 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 ACQJ20X50-40S Is Used
Machining Fixture Tuning
Dial in the exact clamping reach on a CNC fixture during initial setup, adjusting the extend stop from 10 to 50 mm to accommodate varying raw material thicknesses without printing new parts.
Product Changeover Diverter
Reposition a sorting gate on a packaging conveyor line by turning the external M8x1.25 adjuster, matching the stroke end point to new box dimensions rapidly during product changeovers.
Assembly Press Trial
Establish the optimal pressing depth for a new component on an assembly machine by testing intermediate extend positions safely before locking the nut and finalizing the cycle.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40S the Right Cylinder?
If 157.1 N push at 0.5 MPa is insufficient, step up to the 25 mm bore providing 245.4 N; if you need less force, the 16 mm bore offers 100.5 N. For applications requiring a fixed extend position every time without on-machine tuning, a standard ACQ cylinder will suffice. When ordering this adjustable variant, confirm the 20 mm bore, 50 mm full stroke, 40 mm window, the -S magnet option, and your required rod-end 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 ACQJ20X50-40S FAQ
It delivers 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 50 mm, and the external adjuster allows the usable extend range to be set anywhere from 10 mm to 50 mm, shortening the stroke by up to 40 mm.
The external threaded stop with a lock nut physically limits how far the rod extends, changing only the stroke length while keeping the force identical to a standard ACQ. The retract stroke is unaffected. Fixed elastomer bumpers decelerate the piston at both ends, and the built-in magnet works with reed or solid-state switches.
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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