Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-2N
Genuine AirTAC hydraulic shock absorber, order code ACA2020-2N 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
- CapNo cap (N)
- 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 ACA2020-2N
This N-suffix version of the AirTAC ACA20 self-compensating hydraulic shock absorber ships without a cap, so the hardened stainless steel piston rod strikes the moving load directly. That makes the rod face the contact point, useful where a cap would add height or interfere with the striking surface. The one-piece M20x1.5 threaded body still delivers the full 20 mm stroke rating of 60 J per cycle and 50,000 J per hour.
The type 2 speed range covers medium loads at up to 2 m/s, stopping an effective mass of up to 660 kg. Because resistance adjusts itself to each impact there is no damping to dial in; just set the stop nut so the load stops 1 mm before the rod bottoms out, keep side load within 3 degrees, and stay between 20% and 80% of the maximum energy as AirTAC advises. Operating range is -5 to +70 C at 175 g.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2020-2N Technical Specifications
| Order code | ACA2020-2N |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2020 (20 mm stroke) |
| Speed range | 2: medium speed, medium load |
| Cap | No cap (N) |
| 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
Choose ACA2020-2N when your machine already provides the striking surface and a cap would get in the way; the plastic-capped ACA2020-2 suits standard duties and ACA2020-2F suits heavier impacts where a steel cap is wanted. The -2 medium speed rating covers medium loads up to 2 m/s; drop to ACA2020-1N for fast light loads up to 4 m/s (240 kg) or move to ACA2020-3N for slow heavy loads up to 1 m/s (960 kg), guided by where the load bounces: at the start of the stroke means faster type, at the end means slower. For more energy per cycle, the 25 to 40 mm strokes (ACA2025-2N through ACA2040-2N) reach 65 to 80 J.
Applications
Tight-clearance machine stops
Install where cap height would overrun the available space, letting the bare stainless steel rod contact the load directly within the 2 m/s type 2 speed limit.
Medium-speed transfer stations
Decelerate fixtures or carriers moving at medium speed into a fixed nose block on the conveyor, absorbing up to 60 J per cycle through the rod itself.
Rotating arm parking
Cushion the end of a swing arm or indexing lever of up to 660 kg effective mass, with the stop nut doubling the stroke end as a positive mechanical stop.
FAQ
What are the key figures of the ACA2020-2N?
No cap (N version, rod strikes directly), 20 mm stroke, maximum 60 J per cycle and 50,000 J per hour, type 2 medium speed with 2 m/s maximum impact speed and 660 kg maximum effective mass, M20x1.5 body thread, -5 to +70 C, side load 3 degrees or less, 175 g.
Does the lack of a cap affect how I use it?
The energy, speed and mass ratings are identical to the capped ACA2020 builds; the N option simply removes the cap so the hardened stainless steel rod contacts the load directly, so ensure your machine presents a suitable striking surface. All other usage rules still apply: stop the load 1 mm before the rod bottoms out with the stop nut, and work within 20% to 80% of the maximum energy.