The calculation, without hidden assumptions
Calculate theoretical mass for solid regular hexagonal bar using the ordering dimension across flats. The calculator keeps nominal geometry, purchasing allowance and supplier/table comparison separate.
How to use this calculator
Enter the nominal across-flats dimension of the solid hex bar.
Enter equal-piece length and whole-piece quantity in metric or imperial units.
Use the documented density for the actual material or alloy.
Optionally enter procurement allowance, rate/kg, target mass or supplier kg/m.
Review substituted geometry and supplier variance before ordering or logistics decisions.
Where people use it
- •Estimate steel or stainless hexagonal bright-bar mass.
- •Turn a machining-stock cut list into batch weight and cost.
- •Compare steel, aluminum, brass or another documented material density.
- •Reverse a payload or purchasing target into whole equal-length pieces.
- •Compare supplier/table kg/m with nominal regular-hex geometry.
25 mm AF steel hex bar, 6 m × 10 pieces
Area = (√3/2) × 25² = 541.266 mm². At 7,850 kg/m³, unit mass is about 4.249 kg/m. One 6 m piece is about 25.49 kg and 10 pieces are about 254.9 kg before allowance.
What the result does not assume
- •Enter across-flats size, not corner-to-corner diameter.
- •Results use a regular sharp-corner nominal hexagon and entered density.
- •Corner radii, dimensional tolerances, coatings and alloy chemistry can change delivered mass.
- •Allowance is an explicit purchasing input, not a manufacturing standard.
- •Mass geometry does not establish strength, machining suitability, lifting safety or code compliance.
Frequently asked questions
What is the hex bar weight formula?+
For a regular hexagon entered by across-flats size F, area = (√3/2) × F². With F in millimetres, kg/m = area × 10⁻⁶ × density in kg/m³.
What does across flats mean?+
Across flats is the perpendicular distance between two opposite parallel faces. It is not the larger corner-to-corner dimension.
How much does a 25 mm steel hex bar weigh?+
At 7,850 kg/m³, a nominal 25 mm across-flats regular hex bar is about 4.249 kg/m, or about 25.49 kg for 6 m.
Can I calculate pounds per foot?+
Yes. Enter inches and feet if preferred; results include kg/m, lb/ft, kilograms and pounds.
Why can a supplier chart differ?+
Supplier products can use different density assumptions, dimensional tolerances and corner geometry. Enter supplier kg/m to quantify the variance without replacing the theoretical result.
Can I use this for brass or aluminum hex stock?+
Yes when you enter a documented density for the actual alloy. Do not reuse carbon-steel density for another material.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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MAXScanner keeps the formula and assumptions beside the result so you can verify the number before using it in a drawing, estimate, specification, worksheet or document. Where a supplier, manufacturer, drawing or applicable standard owns a requirement, that source remains authoritative.