Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-2
Genuine AirTAC hydraulic shock absorber, order code ACA2020-2 from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- ModelACA2020 (20 mm stroke)
- Speed range2: medium speed, medium load
- CapPlastic cap
- TypeSelf-compensating, speed type 1/2/3
- Body threadM20×1.5
- ACA202020 mm · 60 J/cycle · 50,000 J/h · max. mass 240 / 660 / 960 kg (type 1/2/3) · 175 g
- 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 ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-2
The plastic-capped, medium-speed build of the AirTAC ACA20 self-compensating hydraulic shock absorber family. Its one-piece body carries an M20x1.5 full thread that makes mounting and adjustment easy and sheds heat well, while the hardened stainless steel piston rod resists impact and corrosion. On its 20 mm stroke it absorbs up to 60 J per cycle and 50,000 J per hour, and AirTAC recommends running between 20% and 80% of the maximum energy for long life.
As a type 2 unit it is tuned for medium loads arriving at up to 2 m/s, with a maximum effective mass of 660 kg at this speed range. Set the stop nut so the load stops 1 mm before the rod bottoms out, keep side load at 3 degrees or less, and the absorber will work from -5 to +70 C at a weight of just 175 g.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-2 Technical Specifications
| Order code | ACA2020-2 |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2020 (20 mm stroke) |
| Speed range | 2: medium speed, medium load |
| Cap | Plastic cap |
| Type | Self-compensating, speed type 1/2/3 |
|---|---|
| Body thread | M20×1.5 |
| ACA2020 | 20 mm · 60 J/cycle · 50,000 J/h · max. mass 240 / 660 / 960 kg (type 1/2/3) · 175 g |
| ACA2025 | 25 mm · 65 J/cycle · 54,000 J/h · max. mass 260 / 720 / 1040 kg (type 1/2/3) · 185 g |
| ACA2030 | 30 mm · 70 J/cycle · 58,000 J/h · max. mass 280 / 780 / 1120 kg (type 1/2/3) · 210 g |
| ACA2040 | 40 mm · 80 J/cycle · 65,000 J/h · max. mass 320 / 890 / 1280 kg (type 1/2/3) · 225 g |
| Max impact speed | 4 m/s (type 1), 2 m/s (2), 1 m/s (3) |
| Temperature | -5 to +70 °C |
| Side load angle | 3° or less |
| Piston rod | Hardened stainless steel |
| Accessories | Stop nut, flange |
Source: AirTAC Products Catalog 2026A (PDF01-P0779..P0783), ACA/ACJ series specifications, ordering code and usage notes.
How to choose
The -2 speed type sits between ACA2020-1 (high speed, light loads, up to 4 m/s and 240 kg) and ACA2020-3 (low speed, heavy loads, up to 1 m/s and 960 kg). Choose it for medium-speed, medium-load impacts; if the load bounces back at the start of the stroke move to the faster -1, if it bounces at the end move to the slower -3. Against the other 20 mm caps, this code keeps the standard plastic cap, while ACA2020-2F adds a steel cap for heavier impacts and ACA2020-2N removes the cap so the rod strikes directly. If 60 J per cycle is not enough, the longer ACA2025-2, ACA2030-2 and ACA2040-2 strokes raise capacity to 65, 70 and 80 J.
Applications
Conveyor end stop
Decelerate cartons or totes arriving at medium line speeds within the 2 m/s type 2 limit, with the M20x1.5 threaded body screwed straight into the stop bracket.
Cylinder cushioning retrofit
Fit in place of a failed standard cushion on a medium-load pneumatic cylinder, using the stop nut so the load ends its travel 1 mm before the rod bottoms out.
Sliding fixture positioning
Act as the positive stop on a sliding jig or fixture, with the plastic cap protecting the hardened stainless steel rod and a flange available as an accessory for alignment.
FAQ
What are the key figures of the ACA2020-2?
Stroke 20 mm, maximum energy 60 J per cycle and 50,000 J per hour, speed type 2 with maximum impact speed 2 m/s and maximum effective mass 660 kg, body thread M20x1.5, plastic cap, operating temperature -5 to +70 C, side load 3 degrees or less, weight 175 g.
How should I adjust it for best life?
The self-compensating design adjusts its resistance to each impact, so there is no manual setting of the orifice. Use the stop nut to stop the load 1 mm before the rod bottoms out, size the application within 20% to 80% of the 60 J maximum, and confirm the impact speed sits in the type 2 band; a bounce at the start of the stroke means you need the faster type 1.