What formula is used to calculate bronze hexagon bar weight?

The formula is: Weight = (√3/2) × AF² × Length × Density. AF (across-flats) and length are converted to meters. The cross-section area of a regular hexagon in terms of across-flats distance is (√3/2) × AF² ≈ 0.866 × AF². Multiplying by length gives volume (m³), and multiplying by density (kg/m³) gives weight in kilograms.

What is the across-flats (AF) dimension?

The across-flats (AF) dimension, also called the "width across flats" or "wrench size", is the distance between two parallel flat sides of a hexagonal bar. It is the standard measurement used for hex bolts, nuts, and hex stock. It differs from the across-corners dimension, which is AF × (2/√3) ≈ AF × 1.155.

What is the density of bronze used in this calculator?

The default density for C932 bearing bronze is 8730 kg/m³. Other grades vary slightly: C954 aluminum bronze is 7450 kg/m³, C655 silicon bronze is 8530 kg/m³, C220 commercial bronze is 8800 kg/m³, and C260 cartridge brass is 8520 kg/m³. You can also enter a custom density for other copper alloys.

Does this calculator support metric and imperial units?

Yes. The across-flats dimension can be entered in mm, cm, or inches. Bar length can be entered in meters, mm, feet, or inches. All values are converted to meters internally before the calculation.

How does bronze hexagon bar weight compare to steel or aluminum hex bar?

Bronze is significantly denser than aluminum (8730 vs. ~2700 kg/m³) and slightly denser than carbon steel (~7850 kg/m³). A bronze hex bar is therefore roughly 3.2× heavier than the same-size aluminum bar, and about 11% heavier than an equivalent steel bar.

Can I calculate the total weight for multiple bars?

Yes. Enter the number of bars in the Quantity field and the calculator will show both the per-bar weight and the total weight for the entire batch.

Bronze Hexagon Bar Weight Calculator

Enter the across-flats size and bar length to instantly calculate bronze hexagon bar weight in kg and lbs.

Bar Dimensions

Across-Flats (AF)

Distance between two parallel flat sides (wrench size).

Bar Length

Bronze Grade

Quantity (bars)

Formula Reference

W = (√3/2) × AF² × L × ρ

Where AF = across-flats (m), L = bar length (m), ρ = bronze density (kg/m³), W = weight (kg). Cross-section area = (√3/2) × AF² ≈ 0.866 × AF².

Enter dimensions on the left and click Calculate.

Bronze Alloy Densities

Grade	Type / Use	kg/m³	lb/in³
C932	Bearing Bronze	8730	0.3154
C954	Aluminum Bronze	7450	0.2690
C655	Silicon Bronze	8530	0.3082
C220	Commercial Bronze	8800	0.3179
C260	Cartridge Brass	8520	0.3078
C110	Electrolytic Copper	8900	0.3215

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Summary

Enter the across-flats size and bar length to instantly calculate bronze hexagon bar weight in kg and lbs.

How it works

Enter the across-flats (AF) dimension of the bronze hexagon bar in mm, inches, or cm.
Enter the bar length in meters, mm, feet, or inches.
Select the bronze alloy grade from the dropdown.
Optionally enter a quantity for multiple bars.
The calculator applies W = (√3/2) × AF² × L × ρ and shows weight in kg and lbs.
Click Copy to save the result to your clipboard.

Use cases

Estimating bronze hexagon bar weight for machining and turning stock.
Calculating freight and shipping weight for hex bar stock orders.
Selecting the right bronze alloy by comparing weights for a given size.
Preparing bill of materials (BOM) for valve stems, fittings, and fasteners.
Verifying load limits on lifting and material handling equipment.
Cost estimation for bronze hex bar purchases priced by weight.
Material planning for marine hardware and bearing components.
Comparing bronze hex bar weight versus stainless or aluminum for design optimization.

Frequently Asked Questions

Last updated: 2026-09-19 · Reviewed by Nham Vu