Bolt Weight to Quantity Counter

Inventory management in hardware stores and construction sites often relies on weighing rather than manual counting. This approach saves hours of labor but introduces a margin for error if the unit weight references are inaccurate. The Bolt Weight to Quantity Counter solves this by using standard density profiles and dimensional data (DIN/ISO and ANSI) to determine the exact count of fasteners in a container.

Accuracy is critical when dealing with high-value alloys or large structural bolts where a discrepancy of 1% represents significant financial loss. This tool accounts for the specific geometry of different head types - Hex, Socket Cap, and Carriage - and allows for the subtraction of container weight (Tare). It is designed for warehouse managers, site supervisors, and procurement officers who need to verify bulk shipments or conduct end-of-year stocktaking efficiently.

The core logic derives the quantity N by isolating the net mass of the fasteners and dividing by the theoretical mass of a single unit. The net mass is the total measured mass minus the container (tare) mass.

The unit weight w_unit is often estimated using the volume of the steel and its density ρ (7.85 g/cm³ for carbon steel). The volume V is a sum of the head volume and the shaft volume: