Stainless steel weight charts
Weight per metre is mass per unit length. Quotations, freight bookings and lifting plans use this value. Every figure on this page is calculated, not measured, at a density of 7.90 g/cm³ (7,900 kg/m³), the usual working figure for austenitic stainless steel.
The metal weight calculator is a tool for sizes, grades and lengths that are not listed in the tables below. It applies the same formulas and returns kilograms per metre, kilograms per piece and pieces per tonne.
Density is a material property that varies slightly by grade. Grade 304 has a density near 7.93 g/cm³, and grade 316 has a density near 7.98 g/cm³. Their weights are roughly 0.4 to 1 percent above the values in these tables. A firm figure requires the section data sheet and the mill certificate for the heat.
How to work out weight per metre
Weight per metre equals cross-sectional area times density. With the dimensions in millimetres and 7.90 g/cm³, the coefficients come out as:
| Section | Formula (kg/m) | Dimensions in mm |
|---|---|---|
| Round bar | d² × 0.006205 | d = diameter |
| Square bar | a² × 0.0079 | a = side |
| Hexagon bar | a² × 0.006842 | a = across flats |
| Flat bar | w × t × 0.0079 | w = width, t = thickness |
| Equal angle | (2 × A × t - t²) × 0.0079 | A = leg, t = thickness |
The round bar coefficient is π/4 × 7,900 ÷ 10⁶. For 304 at 7.93 g/cm³ it becomes 0.00623, and for 316 at 7.98 g/cm³, 0.00627.
Worked example
The calculated weight of a 40 mm round bar uses a section value of 40² = 1,600 mm². Multiplication by 0.006205 gives 9.93 kg/m. A 6 metre bar therefore weighs 59.6 kg. The calculation for a 50 × 10 mm flat is 50 × 10 × 0.0079 = 3.95 kg/m, or 23.7 kg in a 6 metre length.
The equal angle formula represents the section as two overlapping rectangles. It excludes the fillet radius at the inner corner and the tapered toe. Comparison with the published chart below shows values that are 1.3 to 2.8 percent lower across the listed range.
Round bar weight chart
The round bar table covers diameters from 6 mm to 100 mm. The values use a density of 7.90 g/cm³.
| Diameter (mm) | Section area (mm²) | Weight (kg/m) | Weight per 6 m bar (kg) |
|---|---|---|---|
| 6 | 28 | 0.22 | 1.3 |
| 8 | 50 | 0.40 | 2.4 |
| 10 | 79 | 0.62 | 3.7 |
| 12 | 113 | 0.89 | 5.4 |
| 14 | 154 | 1.22 | 7.3 |
| 16 | 201 | 1.59 | 9.5 |
| 18 | 254 | 2.01 | 12.1 |
| 20 | 314 | 2.48 | 14.9 |
| 22 | 380 | 3.00 | 18.0 |
| 25 | 491 | 3.88 | 23.3 |
| 28 | 616 | 4.86 | 29.2 |
| 30 | 707 | 5.58 | 33.5 |
| 32 | 804 | 6.35 | 38.1 |
| 35 | 962 | 7.60 | 45.6 |
| 38 | 1,134 | 8.96 | 53.8 |
| 40 | 1,257 | 9.93 | 59.6 |
| 45 | 1,590 | 12.56 | 75.4 |
| 50 | 1,963 | 15.51 | 93.1 |
| 55 | 2,376 | 18.77 | 112.6 |
| 60 | 2,827 | 22.34 | 134.0 |
| 65 | 3,318 | 26.21 | 157.3 |
| 70 | 3,848 | 30.40 | 182.4 |
| 75 | 4,418 | 34.90 | 209.4 |
| 80 | 5,027 | 39.71 | 238.3 |
| 85 | 5,675 | 44.83 | 269.0 |
| 90 | 6,362 | 50.26 | 301.5 |
| 95 | 7,088 | 56.00 | 336.0 |
| 100 | 7,854 | 62.05 | 372.3 |
Laxcon's size range includes hot rolled round bars from 16 mm to 125 mm. It also includes cold-finished bright bars from 5 mm to 115 mm and precision shaft quality bars from 8 mm to 81 mm.
Square and hexagon bar weight chart
The bar table specifies square bars by side and hexagon bars by size across flats. The values use a density of 7.90 g/cm³.
| Size (mm) | Square bar (kg/m) | Hexagon bar (kg/m) |
|---|---|---|
| 12 | 1.14 | 0.99 |
| 14 | 1.55 | 1.34 |
| 16 | 2.02 | 1.75 |
| 18 | 2.56 | 2.22 |
| 20 | 3.16 | 2.74 |
| 22 | 3.82 | 3.31 |
| 25 | 4.94 | 4.28 |
| 28 | 6.19 | 5.36 |
| 30 | 7.11 | 6.16 |
| 32 | 8.09 | 7.01 |
| 35 | 9.68 | 8.38 |
| 40 | 12.64 | 10.95 |
| 45 | 16.00 | 13.85 |
| 50 | 19.75 | 17.10 |
| 55 | 23.90 | 20.70 |
The weight of a hexagon is 86.6 percent of the weight of a square with the same size. This ratio follows from areas of (√3/2)a² and a², respectively. Laxcon draws square bright bars from 12.70 mm to 55 mm and hexagonal bright bars from 16 mm to 55 mm across flats.
Equal angle weight chart
The equal angle data are reproduced from Laxcon's guide, stainless steel equal angle bars: applications and weight chart. The guide obtained the figures from a Stainless Structurals data sheet for Asia.
| Size (A × A × t, mm) | Weight (kg/m) |
|---|---|
| 25 × 25 × 3 | 1.14 |
| 25 × 25 × 5 | 1.81 |
| 30 × 30 × 3 | 1.39 |
| 40 × 40 × 4 | 2.46 |
| 40 × 40 × 6 | 3.58 |
| 50 × 50 × 5 | 3.84 |
| 50 × 50 × 6 | 4.55 |
| 60 × 60 × 6 | 5.53 |
| 65 × 65 × 6 | 6.02 |
| 75 × 75 × 8 | 9.16 |
| 75 × 75 × 10 | 11.27 |
| 80 × 80 × 8 | 9.81 |
| 100 × 100 × 10 | 15.32 |
| 120 × 120 × 12 | 21.89 |
| 125 × 125 × 12 | 22.97 |
The chart note states that the weights are approximate. They are calculated at a stainless steel density of about 7.9 to 8.0 g/cm³. Actual weight varies slightly by grade and rolling tolerance.
Laxcon's range of HRAP equal angles extends from 20 × 20 mm to 125 × 125 mm, with lengths up to 6.4 metres. The linked page provides the full size and thickness listing.
Pipes and tubes weight
Pipe weight per metre is based on the area of an annular section. The formula is kg/m = π × (OD - t) × t × density, with OD and wall thickness t in millimetres. At 7.90 g/cm³, the coefficient is 0.0079. A pipe with a 60.3 mm outside diameter and a 3.91 mm wall therefore weighs 5.47 kg/m.
The schedule chart on the seamless pipe and mother hollow page lists nominal pipe sizes 10 to 50 (3/8 inch to 2 inch) with wall thickness and weight for schedules 5S, 10S, 40S, 80S, 160S and XXS. Those published weights follow the standard schedule tables, which are calculated at 7.85 g/cm³; multiply by 1.006 for 7.90 or 1.010 for 304 at 7.93.
The product pages specify sizes, tolerances and standards for every profile. Requests for weight data for a specific grade, section and length can be submitted to sales@laxconsteels.com or through the enquiry form.