Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-20SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-20SB 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 ACQJ20X50-20SB
The AirTAC ACQJ20X50-20SB is a double-acting JIS compact cylinder with a 20 mm bore and a 50 mm full stroke. An external M8x1.25 threaded stop and lock nut restricts the outward travel, creating a 30 to 50 mm usable extend range. The return stroke remains fixed at the original 50 mm. Because the piston area stays constant, output force equals that of a standard ACQ unit.
This model includes a male M8x1.25 piston rod end for direct load coupling and an M5x0.8 port. The body integrates fixed elastomer TPU bumpers at both ends for end-of-stroke deceleration. Equipped with a piston magnet (-S), it supports both reed and solid-state electronic switches. Operating pressure spans 0.15 to 1.0 MPa, with speeds of 30-500 mm/s.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-20SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-20SB |
|---|---|
| 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 ACQJ20X50-20SB
| 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 ACQJ20X50-20SB Is Used
Machining Fixture Stops
Dial in the exact clamping reach on a milling fixture during setup. The external stop allows 30-50 mm of outward travel tuning without machining custom spacer plates.
Product Changeover Guides
Adapt conveyor guide rails quickly when switching between product sizes. The lock nut secures the new extended end position instantly for the next production run.
Prototype End Positions
Establish the ideal pressing depth on a test rig. You can fine-tune the extend limit by hand across the 20 mm window before finalizing the mechanical design.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-20SB the Right Cylinder?
Choosing this 20 mm bore yields 157.1 N push and 117.8 N pull at 0.5 MPa. If your application requires less force, the smaller 16 mm bore provides 100.5 N push, whereas stepping up to a 25 mm bore offers 245.4 N push. A fixed-stroke ACQ20X50 is sufficient if your end position never requires adjustment. To order, confirm the 20 mm bore, 50 mm full stroke, 20 mm adjuster window, the -S magnet for sensors, and the -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 ACQJ20X50-20SB FAQ
The usable extend range is 30 to 50 mm (a 50 mm full stroke minus the 20 mm window). The force is identical to a standard ACQ20: 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 external M8x1.25 threaded stop physically limits how far the rod extends, leaving the retract stroke unaffected. It changes stroke length only, not the piston area, so force remains unchanged. The cylinder uses fixed elastomer bumpers for deceleration, not adjustable air cushions. Note that a plain cylinder will not hold a load if air pressure is lost; use an external rod lock for fail-safe holding.
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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