Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20SB
The AirTAC Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20SB 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 ACQJ20X70-20SB
The AirTAC ACQJ20X70-20SB is a double-acting JIS compact cylinder featuring an external M8x1.25 threaded stop with a lock nut. This mechanism limits the extend end position, providing a usable forward range of 50 to 70 mm from the 70 mm full stroke. The retract stroke remains completely unaffected by this adjustment. Because the piston area stays constant, the output force is identical to a standard ACQ of the same bore.
Equipped with a male M8x1.25 rod end (-B) for direct load coupling and a built-in magnet (-S), this unit operates at 30-500 mm/s. It uses an M5x0.8 port and relies on a fixed elastomer bumper at each end for end-of-travel deceleration rather than an adjustable air cushion. The magnetic grooves accept both reed and solid-state electronic switches for precise position sensing.
Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20SB Technical Specifications
| Model | Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20SB |
|---|---|
| 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 ACQJ20X70-20SB
| 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 ACQJ20X70-20SB Is Used
Machining Fixture Clamps
Dial in the exact clamping reach on a machining fixture during setup, accommodating varying raw part thicknesses without machining custom spacers.
Packaging Format Changeover
Rapidly modify the extend endpoint to match different carton dimensions on a packaging line, using the lock nut to secure the new stop position.
Assembly Press Trials
Establish the precise insertion depth for a press-fit operation during prototype development, safely testing end positions before finalizing the mechanical stop.
Is the Airtac ACQJ12~25 Adjustable Compact Cylinder ACQJ20X70-20SB the Right Cylinder?
If your application requires less push force, the adjacent ACQJ16 model yields 100.5 N push at 0.5 MPa, whereas stepping up to the ACQJ25 bore provides 245.4 N for heavier loads. If your end position never varies, a fixed-stroke ACQ cylinder is a simpler choice. To order this adjustable variant correctly, confirm the 20 mm bore, 70 mm full stroke, 20 mm window, the -S magnet, and the -B male 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 ACQJ20X70-20SB FAQ
The usable extend range is 50-70 mm (70 mm full stroke minus a 20 mm window), while the retract stroke stays at 70 mm. Force is identical to a standard ACQ: 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.
An external M8x1.25 threaded stop with a lock nut mechanically limits the extend length without altering piston area, so output force remains unchanged. The cylinder uses fixed elastomer bumpers at both ends for deceleration rather than adjustable air cushions, so for high-energy loads you should slow the approach or add an external shock absorber.
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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