Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40SB 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 ACQJ20X50-40SB
The AirTAC ACQJ20X50-40SB is a double-acting JIS compact cylinder with an external extend stop. A threaded rod and lock nut let you dial the usable extend range down to 10 mm from the 50 mm full stroke right on the machine. The retract travel remains fixed at its original length. Because the piston area is unchanged, output force equals a standard ACQ of this bore.
This 20 mm bore unit pushes with 157.1 N at 0.5 MPa and 219.9 N at 0.7 MPa. It features a male M8x1.25 piston rod end for direct coupling, a built-in magnet for reed or solid-state sensing, and a fixed elastomer bumper at each end. Operating pressure spans 0.15 to 1.0 MPa.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40SB |
|---|---|
| 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 ACQJ20X50-40SB
| 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 ACQJ20X50-40SB Is Used
Machining Fixture Stops
Dial in the exact extend position from 10 to 50 mm on a CNC loading fixture when raw material thickness varies, avoiding custom spacer machining.
Carton Changeover Pushers
Quickly shorten the extend stroke on a packaging line to accommodate different box sizes without swapping out the entire pneumatic cylinder assembly.
Assembly Trial Positions
Set temporary end stops during new product line commissioning to test multiple pressing depths before finalizing the mechanical hard stop.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X50-40SB the Right Cylinder?
This 20 mm bore delivers 157.1 N push at 0.5 MPa. If you need less force, the 16 mm bore provides 100.5 N push; for heavier work, the 25 mm bore yields 245.4 N. Choose a fixed-stroke ACQ if your end position never varies. To order this adjustable version, confirm the 50 mm full stroke, the 40 mm window, the S magnet, 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 ACQJ20X50-40SB 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 usable extend range is 10 to 50 mm, adjustable via the 40 mm window. Force is identical to a standard ACQ.
An external M8x1.25 threaded stop with a lock nut limits the extend travel, leaving the retract stroke unaffected. Fixed elastomer bumpers handle end-of-stroke deceleration. The built-in S magnet works with reed or solid-state switches, and the B option provides a male M8x1.25 rod thread.
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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