What is the across-flats (A/F) dimension?

The across-flats dimension is the distance between two parallel flat faces of a hexagon bar. It is also called the wrench size or width across flats (WAF). Do not confuse it with the across-corners dimension, which is larger.

Which density values does this tool use?

Nickel 200/201: 8.89 g/cm³; Monel 400: 8.80 g/cm³; Inconel 600: 8.47 g/cm³; Inconel 625: 8.44 g/cm³; Hastelloy C-276: 8.89 g/cm³. These are standard published densities from ASM and material data sheets.

How is the cross-sectional area of a hexagon calculated?

For a regular hexagon with across-flats dimension A, the area is (√3 / 2) × A². This is equivalent to approximately 0.866025 × A². The calculator uses this formula internally.

Why does the result differ slightly from my supplier quote?

Minor differences arise from mill tolerances on the A/F dimension, surface finish allowances, and whether the supplier uses nominal or measured density. The theoretical weight from this tool is typically within 1–2% of actual weight.

Can I use this for stainless steel or other alloys?

This tool is designed specifically for common nickel alloys. For stainless steel or carbon steel hex bars, use a separate calculator with the appropriate density values.

Nickel Hexagon Bar Weight Calculator

Name: Nickel Hexagon Bar Weight Calculator
Availability: InStock
Author: Nham Vu

Calculate the weight of a nickel alloy hexagon bar from its across-flats dimension, length, and alloy grade.

Bar Parameters

Nickel Alloy Grade

Unit System

Metric (mm / kg) Imperial (in / lb)

Across-Flats (A/F) mm

Bar Length mm

Quantity (bars)

Weight Results

Fill in the parameters and click Calculate.

Common Nickel 200 Hex Bar Weights (3 m length)

A/F (mm)	kg/bar

Summary

Calculate the weight of a nickel alloy hexagon bar from its across-flats dimension, length, and alloy grade.

How it works

Select the nickel alloy grade to load its density.
Enter the across-flats (A/F) dimension of the hexagon bar.
Enter the bar length and choose the unit system (metric or imperial).
Optionally enter a quantity for multiple bars.
Click Calculate to get the weight per bar and total weight.

Use cases

Estimate material weight for procurement and shipping of nickel hex bars.
Verify mill certificate weights against theoretical values.
Compare weights across different nickel alloy grades.
Calculate freight costs based on total bar weight.
Support machining project planning with accurate material weights.
Convert between kg and lb for international orders.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu