Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-2N
Genuine AirTAC hydraulic shock absorber, order code ACA2040-2N 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
- 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 ACA2040-2N
The AirTAC ACA2040-2N is ordered with the N suffix, which means no cap: the piston rod itself takes the incoming impact directly. This suits machines that bring their own strike button or rolling contact to the absorber face. The hydraulic element is unchanged from the rest of the ACA20 family - a self-compensating, speed type 2 unit rated for medium speeds up to 2 m/s and effective masses up to 890 kg.
Because there is no cap in front of it, the exposed rod is made of hardened stainless steel to resist both the impact and corrosion. The 40 mm stroke is the longest offered on the M20x1.5 fully threaded body, delivering up to 80 J per cycle and 65,000 J per hour at a weight of 225 g. Operating range is -5 to +70 C with side loads of 3 degrees or less, and a stop nut plus an optional flange complete the mounting hardware.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-2N Technical Specifications
| Order code | ACA2040-2N |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2040 (40 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
Order the -2N when the striking machine part is itself a suitable contact face, since this code ships without any cap; the plain ACA2040-2 with plastic cap and the ACA2040-2F with steel cap are the capped alternatives in the same body. Speed type 2 is the middle choice of the three on the 40 mm body - step to -1 for fast light loads up to 4 m/s or to -3 for slow heavy loads down to 1 m/s. If 80 J per cycle exceeds your need, the shorter ACA2030, ACA2025 and ACA2020 strokes scale the absorption down to 60 J.
Applications
Robot end-of-arm stops
Mounted where the robot arm or gripper carries its own hardened strike pad, so the uncapped rod contacts the machine's own button directly at medium approach speeds.
Roller-approach transfer stops
Stopping pallets or fixtures that arrive on rollers gives a rolling contact face, making a cap unnecessary; the 2 m/s type 2 rating matches typical transfer speeds.
Test rig deceleration points
Self-compensating resistance absorbs varying test masses without retuning, and the stop nut provides the repeatable mechanical end position rigs need.
FAQ
What are the key figures of the ACA2040-2N?
40 mm stroke, M20x1.5 fully threaded body, supplied with no cap (N option) so the hardened stainless steel rod takes the impact directly, speed type 2 (medium, up to 2 m/s), maximum energy 80 J per cycle and 65,000 J per hour, maximum effective mass 890 kg at the type 2 rating, weight 225 g, temperature -5 to +70 C, side load 3 degrees or less.
What strikes the rod on an N-version absorber?
Whatever the machine presents - the catalog notes that N versions have no cap and the rod strikes directly, so the incoming part should offer a suitable hardened or rolling contact face. If the strike point is bare or abrasive, the plastic-capped ACA2040-2 or steel-capped ACA2040-2F on the identical 40 mm type 2 body are the safer choices.