1-1/4 inch steel plate weight
249.24 kg/m² · 51.05 lb/ft²
A 1-1/4 inch (31.75 mm) carbon steel plate weighs 249.24 kg per square metre: 31.750 mm × 7.85 kg/(m²·mm).
Weight of standard plate sizes
| Plate size | kg | lb |
|---|---|---|
| 4 × 8 ft | 741.0 | 1,633.5 |
| 4 × 10 ft | 926.2 | 2,041.9 |
| 5 × 10 ft | 1,157.7 | 2,552.4 |
| 8 × 20 ft | 3,704.8 | 8,167.7 |
Same thickness in other metals
| Material | kg/m² | lb/ft² |
|---|---|---|
| Stainless steel 304 | 251.78 | 51.57 |
| Aluminum | 85.73 | 17.56 |
| Copper | 284.48 | 58.27 |
| Brass | 269.88 | 55.27 |
Weight of cut pieces
Base plates, gussets, cleats and flange blanks are cut from plate. Weights below are for the full square or disc, before holes, slots or chamfers.
| Square piece | kg | lb |
|---|---|---|
| 4 × 4 in | 2.57 | 5.67 |
| 6 × 6 in | 5.79 | 12.76 |
| 8 × 8 in | 10.29 | 22.69 |
| 10 × 10 in | 16.08 | 35.45 |
| 12 × 12 in | 23.15 | 51.05 |
| 18 × 18 in | 52.10 | 114.86 |
| 24 × 24 in | 92.62 | 204.19 |
| 48 × 48 in | 370.48 | 816.77 |
| Round disc | kg | lb |
|---|---|---|
| Ø 4 in | 2.02 | 4.45 |
| Ø 8 in | 8.08 | 17.82 |
| Ø 12 in | 18.19 | 40.09 |
| Ø 24 in | 72.74 | 160.37 |
| Ø 48 in | 290.97 | 641.49 |
For any other shape, multiply the area by 249.24 kg/m² (51.05 lb/ft²). For a ring or a plate with a hole, subtract the hole's area.
Sheets per short ton
| Sheet size | Sheets |
|---|---|
| 4 × 8 ft | 1.2 |
| 5 × 10 ft | 0.8 |
| 8 × 20 ft | 0.2 |
Compared with nearby thicknesses
| Thickness | kg/m² | lb/ft² | vs 1-1/4 inch |
|---|---|---|---|
| 3/4 in | 149.54 | 30.63 | −40 % |
| 1 in | 199.39 | 40.84 | −20 % |
| 1-1/4 in | 249.24 | 51.05 | — |
| 1-1/2 in | 299.08 | 61.26 | +20 % |
| 2 in | 398.78 | 81.68 | +60 % |
The nearest standard metric thickness is 30 mm (30.00 mm, 235.50 kg/m²). Plate this thick is used for heavy base plates, crane girder flanges, machine beds, press frames, pressure vessels and wear parts.
Hot-rolled plate is made to a thickness tolerance (EN 10029 in Europe, ASTM A6 in the US). These tolerances allow more over-thickness than under-thickness, so weighbridge weights can come out a little above the theoretical weight.
Frequently asked questions
How much does 1-1/4 inch steel plate weigh per square foot?
51.05 lb/ft²: 1.2500 in × 40.8 lb per ft² per inch.
How much does a 4 × 8 sheet of 1-1/4 inch steel plate weigh?
1,633.5 lb (32 ft² × 51.05 lb/ft²). A 5 × 10 ft sheet weighs 2,552.4 lb.
What is the metric equivalent of 1-1/4 inch plate?
The nearest standard metric thickness is 30 mm (30.00 mm). They are not identical, so check tolerances and weights if you substitute.
How much does a 12 × 12 in piece of 1-1/4 inch plate weigh?
51.05 lb (1 ft² × 51.05 lb/ft²), before holes or chamfers.
How much does 1-1/4 inch aluminum or stainless plate weigh?
Aluminum 1-1/4 inch plate weighs about 85.73 kg/m², stainless steel 304 about 251.78 kg/m².
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