Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-2
Genuine AirTAC hydraulic shock absorber, order code ACA2040-2 from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- ModelACA2040 (40 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 ACA2040-2
The AirTAC ACA2040-2 is a self-compensating hydraulic shock absorber with a 40 mm stroke on a fully threaded M20x1.5 body. The -2 suffix selects speed type 2, the medium-speed and medium-load rating: impact speeds up to 2 m/s and a maximum effective mass of 890 kg. At this longest stroke in the family it absorbs up to 80 J per cycle and 65,000 J per hour, and the whole unit weighs just 225 g.
Self-compensation means the internal resistance adjusts itself to each impact, so no separate regulator is tuned per station. The standard plastic cap shields the rod face from light scuffs between impacts, the hardened stainless steel piston rod resists impact and corrosion, and the threaded one-piece body mounts easily and sheds heat well. A stop nut and a flange are available as accessories, and the absorber works from -5 to +70 C with side loads kept within 3 degrees.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-2 Technical Specifications
| Order code | ACA2040-2 |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2040 (40 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 40 mm stroke is the longest in the ACA20 series, so choose this code over ACA2020, ACA2025 and ACA2030 (20, 25 and 30 mm, 60 to 70 J per cycle) when the load needs the full 80 J of absorption or more deceleration travel. Within the same 40 mm body, speed type is the next decision: -1 suits fast light loads up to 4 m/s and -3 suits slow heavy loads up to 1 m/s, while this -2 covers medium duty. If bounces occur at the start of the stroke, move to a faster type; at the end of the stroke, a slower one. For a heavier strike face, compare the -2F steel cap version.
Applications
Conveyor end stops
Decelerates cartons or pallets arriving at 2 m/s or less; the 890 kg type 2 mass rating and 80 J per cycle cover accumulated loads, with the stop nut acting as the positive end position.
Pick-and-place cylinder cushioning
Self-compensating resistance absorbs a horizontal slide table that carries varying payloads, so no re-adjustment is needed when the gripped mass changes between cycles.
AGV docking stations
Medium-speed guided vehicles docking into a fixed station benefit from the 65,000 J/h duty rating across continuous shift cycles at -5 to +70 C ambient.
FAQ
What are the key figures of the ACA2040-2?
40 mm stroke, M20x1.5 fully threaded body, speed type 2 (medium speed and load, up to 2 m/s), maximum energy absorption 80 J per cycle and 65,000 J per hour, maximum effective mass 890 kg at the type 2 rating, weight 225 g, operating temperature -5 to +70 C, side load angle 3 degrees or less, hardened stainless steel piston rod, plastic cap fitted.
How should I size and install it for long life?
Check the energy per cycle and effective mass against the catalog table and stay within 20% to 80% of the maximum energy value, as AirTAC recommends. Mount via the M20x1.5 thread or the optional flange, and set the stop nut so the load is stopped 1 mm before the rod bottoms out; the stop nut then doubles as the positive stroke-end stop.