Genuine AirTAC hydraulic shock absorber, order code ACA2025-1N from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
The N suffix on ACA2025-1N means no cap: the hardened stainless steel piston rod is left bare, so the load meets the rod itself rather than a plastic or steel cap. Underneath, this is the 25 mm stroke ACA20 self-compensating hydraulic absorber in type 1, the high speed, light load version of the series. It brakes impacts up to 4 m/s with effective masses up to 260 kg, absorbing up to 65 J per cycle at up to 54,000 J/h on its M20x1.5 fully threaded body.
Self-compensation means the internal resistance adapts to each impact with no setting screws to touch, which suits applications where impact speed varies. The threaded one-piece body screws into place, adjusts along its length and sheds heat across -5 to +70 C. With no cap fitted, make sure the striking face is clean and square (side load 3 degrees or less) and use the stop nut accessory to halt the load 1 mm before the rod bottoms out.
| Order code | ACA2025-1N |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2025 (25 mm stroke) |
| Speed range | 1: high speed, light 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.
ACA2025-1N is the 25 mm, type 1 absorber with the cap deleted from the order code, so choose it when the rod should contact the load directly or when a cap would foul your fixture. The performance envelope is shared with its siblings: up to 4 m/s and 260 kg effective mass, 65 J/cycle at 54,000 J/h. If you want end protection, the plastic-cap ACA2025-1 or steel-cap ACA2025-1F carry the same figures. For slower or heavier loads on the same body step to ACA2025-2 (2 m/s, 720 kg) or ACA2025-3 (1 m/s, 1040 kg); for more energy per cycle, ACA2030-1 and ACA2040-1 offer 70 J and 80 J. Keep the working point between 20 and 80 percent of maximum energy.
Where the rod must contact the moving mass directly with no cap in between, the capless rod and self-compensating braking absorb up to 65 J per cycle at speeds to 4 m/s.
Light, fast moving gates and pushers in the type 1 range are braked smoothly up to 260 kg effective mass, with the M20x1.5 body threaded into the machine frame.
At 185 g and with no cap adding length, the ACA2025-1N fits recessed mounting points on small slides; the stop nut converts the last 1 mm of travel into a positive stop.
25 mm stroke, 65 J per cycle maximum energy, 54,000 J/h absorption rate, M20x1.5 threaded body, 185 g weight, no cap (N option, rod strikes directly). Type 1 speed range: impacts up to 4 m/s and effective mass up to 260 kg, with 720 kg and 1040 kg possible on type 2 and type 3 versions. Operating range -5 to +70 C, side load within 3 degrees.
Because the piston rod is exposed, the striking face should be flat, clean and perpendicular to the rod, and side load must stay at 3 degrees or less to protect the hardened stainless rod. Use the stop nut so the load stops 1 mm before the rod bottoms out. If the rod end needs protection, order the plastic-cap ACA2025-1 or steel-cap ACA2025-1F instead.