Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-3
Genuine AirTAC hydraulic shock absorber, order code ACA2020-3 from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- ModelACA2020 (20 mm stroke)
- Speed range3: low speed, heavy 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 ACA2020-3
The ACA2020-3 is the 20 mm stroke member of the AirTAC ACA series with speed type 3 damping, made for slow impacts where the moving mass is at its heaviest: up to 960 kg on a type 3 profile, absorbing up to 60 J per cycle and 50,000 J/h. The self-compensating hydraulic design adjusts its own resistance to the impact, so no external adjustment is needed as load conditions drift. The fully threaded M20x1.5 one-piece body is easy to mount and position, and it sheds heat well during continuous cycling.
The plastic cap on this version shields the end of the hardened stainless steel piston rod, which resists both impact wear and corrosion. AirTAC rates the ACA20 family from -5 to +70 C and asks that side loads stay within 3 degrees. A stop nut can be fitted so the stroke end acts as a positive stop, and a flange is available as an accessory.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-3 Technical Specifications
| Order code | ACA2020-3 |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2020 (20 mm stroke) |
| Speed range | 3: low speed, heavy 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
This code differs from its cap siblings ACA2020-3F and ACA2020-3N: the F version carries a steel cap for heavier impacts, while the N version runs bare rod for direct strikes. Within the type 3 stroke range, step up to ACA2025-3 (65 J, 1040 kg), ACA2030-3 (70 J, 1120 kg) or ACA2040-3 (80 J, 1280 kg) only if your energy per cycle exceeds the 60 J of the 20 mm body. If your impact speed is above 1 m/s, a type 2 or type 1 dash number will suit better, because type 3 is tuned for low speed and heavy load.
Applications
Heavy cart end stop
A slowly rolling loaded cart reaching a fixed stop fits type 3 damping: the ACA2020-3 absorbs the energy of heavy masses moving at low speed, up to 960 kg within the recommended 20 to 80 percent energy band.
Vertical slide cushioning
Mounted under a vertically descending heavy fixture, the self-compensating 60 J absorption takes the landing shock while the stop nut turns the stroke end into a positive mechanical stop.
Slow indexing station
On low-speed indexing fixtures where the M20x1.5 threaded body is screwed into a tapped hole, the plastic cap protects the rod tip between cycles at rates within 50,000 J/h.
FAQ
What are the key figures of the ACA2020-3?
20 mm stroke, M20x1.5 body thread, 60 J/cycle maximum energy, 50,000 J/h, maximum mass 240/660/960 kg for speed type 1/2/3 (this is type 3, so up to 960 kg at impact speeds up to 1 m/s), weight 175 g, temperature -5 to +70 C, side load 3 degrees or less, plastic cap.
How should I position it for a long service life?
AirTAC recommends using 20 to 80 percent of the maximum energy per cycle, and stopping the load about 1 mm before the rod bottoms out by setting the stop nut. If the load bounces at the start of the stroke, move to a faster type; if it bounces at the end, a slower type is indicated.