The Sakai DD31HF is a static smooth drum roller designed for efficient asphalt compaction in road construction and maintenance. It features a 49.2 in (1,250 mm) wide smooth steel drum with a 29 in (736 mm) diameter, providing a consistent 49.2 in operating width for uniform mat finish. The roller delivers a vibration frequency of 70 vpm (70 Hz) to ensure high-density compaction across a range of asphalt mixes. Power is supplied by a Kubota V2203-M vertical, water-cooled, 4-cylinder diesel engine that produces 44 hp (32.8 kW) at 2,800 rpm, offering reliable performance and durability in demanding conditions. The machine has an operating weight of 6,840 lb (3,102 kg), contributing to strong static and vibratory compaction force. With an overall length of 8.39 ft (101 in), width of 4.48 ft (53.7 in), and height of 8.3 ft (99.5 in), the DD31HF maintains a compact footprint suitable for confined job sites. It runs on a 12 V electrical system with a 40 A alternator and is equipped with a fuel tank capacity of 18 gal (68.1 L) and a hydraulic system fluid capacity of 22.4 gal (84.8 L) for extended operation. Maximum travel speed reaches 6.3 mph (10.1 km/h), and the roller is built with a centerpoint articulation steering system for excellent maneuverability and a tight turning radius.