Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-3
Genuine AirTAC hydraulic shock absorber, order code ACA2040-3 from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- ModelACA2040 (40 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 ACA2040-3
The ACA2040-3 is the long-stroke, low-speed member of the AirTAC ACA self-compensating series: a 40 mm hydraulic shock absorber on an M20x1.5 fully threaded body, fitted with the standard plastic cap. Speed type 3 is tuned for slow, heavy loads, accepting impact speeds up to 1 m/s and a maximum effective mass of 1280 kg, while absorbing up to 80 J per cycle and 65,000 J per hour.
Because the resistance self-adjusts to each impact, the unit needs no manual setting as load conditions change. AirTAC recommends operating between 20% and 80% of maximum energy and stopping the load about 1 mm before the rod bottoms out using the stop nut accessory, which extends service life. The hardened stainless steel piston rod resists impact and corrosion, and the threaded body mounts, adjusts and sheds heat easily.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-3 Technical Specifications
| Order code | ACA2040-3 |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2040 (40 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
Within the 40 mm family, this code pairs type 3 damping with the standard plastic cap. If your impact arrives faster and lighter, step down to ACA2040-2 (up to 2 m/s) or ACA2040-1 (up to 4 m/s); if you need a steel cap for heavier strike faces, order ACA2040-3F, or ACA2040-3N if the rod should strike directly with no cap. If 80 J per cycle is more than you need, the ACA2030-3 (70 J) and ACA2025-3 (65 J) on the same M20x1.5 thread cover shorter strokes.
Applications
Pallet handler end stop
A slowly moving pallet carriage or lift table up to 1280 kg effective mass can be brought to a smooth, bounce-free halt at the end of travel, within the 1 m/s limit of type 3.
Heavy vertical slide
A gravity-driven Z-axis or counterweighted slide descending at low speed dumps up to 80 J per cycle into the absorber, with the plastic cap spreading the strike face load.
Slow heavy transfer station
On transfer lines running under 1 m/s with heavy fixtures, the threaded M20x1.5 body mounts through a stop nut or flange so the stroke end doubles as a positive stop.
FAQ
What are the key figures of the ACA2040-3?
Stroke 40 mm, maximum energy 80 J per cycle and 65,000 J per hour, maximum effective mass 1280 kg for type 3, maximum impact speed 1 m/s, body thread M20x1.5, weight 225 g, temperature range -5 to +70 C, side load 3 degrees or less. It carries the standard plastic cap; stop nut and flange are available as accessories.
Why choose type 3 instead of type 1 or 2 on the same body?
Type 3 is the low-speed, heavy-load tuning: up to 1 m/s with a 1280 kg maximum mass, versus 2 m/s / 890 kg for type 2 and 4 m/s / 320 kg for type 1. If the load bounces back at the end of the stroke, the damping is too slow for the impact, so move to a lower-numbered type.