S18X70 Dimensions & Weight
S18X70 is an AISC American Standard (S) beam with an actual depth of 18 in and a 6.3 in flange, weighing 70 lb per foot — commonly used for floor beams and roof framing. It is the heaviest of the 2 S18 sizes listed here.
S18X70 Dimensions
| Property | Imperial | Metric |
|---|---|---|
| Depth (d) | 18 in | 457.2 mm |
| Flange width (bf) | 6.25 in | 158.8 mm |
| Cross-section area (A) | 20.6 in² | 132.9 cm² |
| Weight | 70 lb/ft | 104.2 kg/m |
Standard: AISC. Values from the published section tables; dimensions not listed here are not shown rather than estimated.
What does S18X70 weigh and cost?
S18X70 weighs 70 lb per foot. At an example material price of $0.92/lb that is about $64.40 per foot. Set your quantity, length, and price to total your own run:
Material only, example pricing. Actual steel pricing varies by region, grade, quantity, and market conditions — use your own supplier numbers for real bids.
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Related sizes
Deeper reading: AISC Shape Database Guide · How to calculate steel weight