Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-3N
Genuine AirTAC hydraulic shock absorber, order code ACA2040-3N 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
- 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 ACA2040-3N
The ACA2040-3N is ordered with the N suffix: no cap at all, so the hardened stainless steel piston rod takes the impact directly. That leaves the 40 mm stroke fully exposed for machines that bring their own striking button or bumper to the rod. The absorber itself is the self-compensating type 3 build: 80 J per cycle, 65,000 J per hour, an M20x1.5 fully threaded body and a 225 g weight.
Type 3 is the slow-and-heavy tuning of the ACA series, accepting impact speeds up to 1 m/s and effective masses up to 1280 kg. Damping adjusts automatically to each impact, and operation spans -5 to +70 C with side load kept within 3 degrees. AirTAC's usage notes call for running at 20% to 80% of rated energy and using the stop nut accessory to halt the load about 1 mm before rod bottom-out; a flange is also available.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-3N Technical Specifications
| Order code | ACA2040-3N |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2040 (40 mm stroke) |
| Speed range | 3: low speed, heavy 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
This code is the right pick when your machine supplies its own impact button and you want the rod striking bare for maximum clearance, with nothing between rod and load. If you would rather protect the rod face, take ACA2040-3 (plastic cap) or ACA2040-3F (steel cap for heavier impacts). If 1 m/s is too slow for your impact, the same 40 mm body is available as ACA2040-2 or ACA2040-1; for less energy per cycle, see ACA2030-3, ACA2025-3 or ACA2020-3 on the same M20x1.5 thread.
Applications
Machine integral stop button
When the moving slide already carries its own hardened striking button, the N build lets it land directly on the rod, using the full 40 mm type 3 stroke for slow, heavy loads.
Vertical drop of heavy mass
A slowly descending mass up to 1280 kg effective weight, arriving under 1 m/s, is arrested across the 40 mm stroke with up to 80 J absorbed per cycle and no cap to obstruct the strike path.
Compact end-of-travel station
Where space is tight around a low-speed axis, the bare rod plus M20x1.5 threaded body and stop nut form the shortest practical positive-stop assembly, with flange mounting optional.
FAQ
What are the key figures of the ACA2040-3N?
40 mm stroke, 80 J per cycle and 65,000 J per hour maximum, type 3 speed range to 1 m/s with a 1280 kg maximum effective mass, M20x1.5 fully threaded body, 225 g weight, -5 to +70 C, side load 3 degrees or less. The N suffix means no cap, so the hardened stainless steel rod takes the impact directly; stop nut and flange are accessories.
Is running without a cap a limitation?
It is a deliberate ordering choice, not a defect: the N version is specified when the striking machine face or an added button contacts the rod directly. If your impact face is exposed or abrasive, the plastic cap of the ACA2040-3 or the steel cap of the ACA2040-3F is the better match on identical ratings.