Elite Robots' three biggest cobots weigh the same. Their payload climbs from 20 to 30 kg

Elite Robots of Suzhou sells six collaborative arms in its CS series, and the numbers on its own product pages describe a range that stops growing physically while it keeps growing in capability. The first three models scale the way arms usually do. The CS63 carries 3 kg and weighs 15 kg; the CS66 carries 6 kg and weighs 20 kg; the CS612 carries 12 kg and weighs 34 kg. Payload roughly doubles, mass rises with it, and the ratio of what the machine lifts to what it weighs improves from 0.20 to 0.35. At the top of the range the mass stops. The CS620 lifts 20 kg and weighs 60 kg. The CS625 lifts 25 kg and weighs 58 kg. The CS530H, the newest and strongest arm in the family, lifts 30 kg and also weighs 58 kg. Half a family's worth of extra payload arrives on a body that never gets heavier — the payload-to-weight ratio rises from 0.33 to 0.52, and the strongest arm is fractionally the lightest of the three. What pays for it is reach. The CS620 stretches to 1,800 mm, the longest arm the company builds; the CS625 pulls back to 1,500 mm and the CS530H to 1,522 mm. Shortening the lever is what lets the same motors hold more weight. The same trade shows up in accuracy: the CS625, on the shortest of the three arms, is the most repeatable at +/-0.08 mm, while both 30 kg and 20 kg models sit at +/-0.1 mm. The CS530H also breaks a habit of the category. Its tool point moves at 4.0 m/s, the fastest in the family, while carrying the heaviest load — the CS625 manages 3.3 m/s with 5 kg less. Elite Robots describes the model as built around palletising, reaching stacking heights of up to 2,300 mm, which explains a design tuned for vertical throughput rather than radius. Across the whole six-model range the pattern of the industry holds: precision degrades as the arm gets longer, from +/-0.02 mm on the 624 mm CS63 to +/-0.1 mm on the 1,800 mm CS620 — a fivefold spread. It is the same relationship visible in Universal Robots' range, where the smallest and oldest arm is still the most accurate. The manufacturer does not date the CS530H publicly. Web archive snapshots place it: the company's product listing of 19 June 2024 already showed the other five CS arms and not this one, and its product page has no snapshot before 19 March 2025. The three smallest models appear in the listing archived on 31 March 2023, consistent with the manufacturer's own statement that the CS series was released in 2022.