🔍 /

Bolt Weight to Quantity Calculator (Count Estimator)

Estimate the number of bolts in a bulk container by weight. Supports DIN 933 standards, various diameters (M6-M20), lengths, and materials (Steel, Brass).

User Rating 0.0 ★★★★★
Total Usage 0 times
Category Planning & Estimates

Bolt Specs (DIN 933)

Total Bulk Weight

Is this tool helpful?

Your feedback helps us improve.

★ ★ ★ ★ ★

About

Inventory management in construction and hardware retail often involves handling bulk shipments of fasteners. Counting thousands of bolts manually is inefficient. This tool estimates the total quantity of hexagon head bolts (DIN 933 standard) based on the total net weight. By selecting the material density and dimensions, it calculates the approximate weight of a single unit to derive the total count.

It is designed for warehouse managers and purchasing agents. Note that manufacturing tolerances and plating thickness can introduce a variance of ±5%.

bolt counter hardware estimator construction calculator fasteners din 933 inventory

Formulas

The calculator generates a theoretical weight for a single bolt (Wsingle) based on the volume of the head and shank, multiplied by material density (ρ):

Wsingle ≈ (Vhead + Area × Length) × ρ

The final quantity (N) is derived from the total bulk weight (Wtotal):

N = WtotalWsingle

Reference Data

DiameterAvg Head Weight (g)Shank Weight (g/mm)Approx Weight M10x50 Steel
M62.50.17-
M85.20.31-
M109.80.4934.3 g
M1216.50.70-
M1635.01.29-
M2065.02.00-

Frequently Asked Questions

It is an estimation tool. Steel density varies slightly by alloy (7.8 to 7.9 g/cm³), and zinc plating adds weight. Expect a margin of error around 5%. Always weigh a sample of 10 bolts for higher precision if possible.
Currently, this logic is calibrated specifically for Hexagon Head Bolts (DIN 933 / ISO 4017). Nuts have a completely different weight-to-diameter ratio.
Select "Stainless Steel" in the material dropdown. Stainless (A2/A4) has a density of ~7.9-8.0 g/cm³, slightly heavier than mild steel.