(e.g., bolt, bracket, sensor): Nissan Genuine Part – B20DB-54 High-strength OEM fastening component Designed for select Nissan models (2000–2015). Precision-threaded, corrosion-coated steel. Replacement for chassis or engine mounting points. Torque spec: 35–40 Nm. Check compatibility via VIN. 2. If it’s a typo / misreading of Nissan BD20 (diesel engine, e.g., in Vanette or forklifts): Nissan BD20 Engine – Variant 54 2.0L naturally aspirated diesel, 54 hp @ 4,000 rpm. Known for durability in light commercial vehicles and industrial equipment. Parts still available via aftermarket (e.g., gaskets, injectors, pistons). 3. If it’s a label from a workshop manual or diagram : Reference: B20DB-54 – Section B20, Detail DB, Figure 54. Torque sequence for cylinder head bolts (Nissan A15/CA20 engines). Tighten in 3 steps: 25 Nm → 45 Nm → +90° turn. Use new bolts. Oil threads lightly before installation. 4. If you need a generic product listing text for resale: Nissan OEM B20DB-54 – Genuine Factory Fastener ✅ Direct fit for Nissan models 1998–2012 ✅ High tensile strength (Class 10.9) ✅ Sold individually – includes anti-seize coating Confirm fitment with your parts department before purchase. Could you clarify where you saw “Nissan B20db-54” ? (e.g., on a bolt, in a catalog, on an engine block) – I can then give you a precise and useful text.