Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-1N
Genuine AirTAC hydraulic shock absorber, order code ACA2040-1N from the ACA20 range. The options this code selects are decoded below; series data follow the official AirTAC catalog.
- ModelACA2040 (40 mm stroke)
- Speed range1: high speed, light 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 ACA2040-1N
The ACA2040-1N is the no-cap (N) variant of the 40 mm, speed type 1 ACA20 shock absorber: the rod strikes directly, so it suits machines that already provide their own striking pad or need a flush, cap-free front face. Performance at this stroke reaches up to 80 J per cycle and 65000 J/h, braking high-speed light loads of up to 320 kg at impact speeds up to 4 m/s.
It is self-compensating, so braking force follows each impact without preset adjustment. The fully threaded M20x1.5 one-piece body mounts easily and sheds heat, the piston rod is hardened stainless steel for impact and corrosion resistance, and the absorber operates from -5 to +70 C with side loads kept at 3 degrees or less.
Airtac ACA Standard Automatic Compensation Hydraulic Shock Absorber ACA2040-1N Technical Specifications
| Order code | ACA2040-1N |
|---|---|
| Product | Hydraulic Shock Absorber |
| Model | ACA2040 (40 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.
How to choose
Take ACA2040-1N over ACA2040-1 (plastic cap) or ACA2040-1F (steel cap) only when your machine supplies the striking surface, since the N option ships with no cap at all. Within the stroke range it is the largest of the series; the shorter ACA2030, ACA2025 and ACA2020 give 70, 65 and 60 J per cycle. Type 1 covers impact speeds up to 4 m/s; choose -2 (2 m/s) or -3 (1 m/s) for slower, heavier arrivals.
Applications
Rotating index table stops
Damps fast index tables whose own hardened stop pin contacts the bare rod, using the 40 mm travel to spread up to 80 J per cycle without a cap in the way.
Clamp and fixture snubbing
Absorbs the final motion of light, quick clamps where a cap would block the fixture; the M20x1.5 threaded body screws straight into a tapped boss.
Transfer shuttle braking
Slows fast, light shuttles moving between stations at up to 4 m/s, with the stop nut defining a positive stop 1 mm before the rod bottoms out.
FAQ
Which figures define the ACA2040-1N?
40 mm stroke, speed type 1 up to 4 m/s impact speed, 80 J per cycle and 65000 J/h maximum absorption, 320 kg maximum mass in type 1 service, M20x1.5 fully threaded body, 225 g weight, -5 to +70 C temperature range, 3 degrees maximum side load, and no cap on the rod.
Is the N version different inside from the capped models?
No, the N ordering code only removes the cap so the rod strikes directly; braking behavior is the same type 1 tuning. The stop nut and flange remain available as accessories, and the same rule of using 20 to 80 percent of the maximum energy applies when sizing.