S Shapes (American Standard Beams): Sizes & Weights

Tapered-flange I-beams, still specified for monorails, hoist beams, and older-building repairs. 28 sizes from the AISC catalog, in lb/ft with kg/m alongside. Deeper reading: AISC Shape Database Guide.

S3 series

Designation	lb/ft	kg/m	Area (in²)
S3X5.7	5.7	8.5	1.67
S3X7.5	7.5	11.2	2.21

S4 series

Designation	lb/ft	kg/m	Area (in²)
S4X7.7	7.7	11.5	2.26
S4X9.5	9.5	14.1	2.79

S5 series

Designation	lb/ft	kg/m	Area (in²)
S5X10	10	14.9	2.94

S6 series

Designation	lb/ft	kg/m	Area (in²)
S6X12.5	12.5	18.6	3.67
S6X17.25	17.25	25.7	5.07

S8 series

Designation	lb/ft	kg/m	Area (in²)
S8X18.4	18.4	27.4	5.41
S8X23	23	34.2	6.77

S10 series

Designation	lb/ft	kg/m	Area (in²)
S10X25.4	25.4	37.8	7.46
S10X35	35	52.1	10.3

S12 series

Designation	lb/ft	kg/m	Area (in²)
S12X31.8	31.8	47.3	9.35
S12X35	35	52.1	10.3
S12X40.8	40.8	60.7	12
S12X50	50	74.4	14.7

S15 series

Designation	lb/ft	kg/m	Area (in²)
S15X42.9	42.9	63.8	12.6
S15X50	50	74.4	14.7

S18 series

Designation	lb/ft	kg/m	Area (in²)
S18X54.7	54.7	81.4	16.1
S18X70	70	104.2	20.6

S20 series

Designation	lb/ft	kg/m	Area (in²)
S20X66	66	98.2	19.4
S20X75	75	111.6	22
S20X86	86	128	25.3
S20X96	96	142.9	28.2

S24 series

Designation	lb/ft	kg/m	Area (in²)
S24X80	80	119.1	23.5
S24X90	90	133.9	26.5
S24X100	100	148.8	29.3
S24X106	106	157.7	31.2
S24X121	121	180.1	35.6

Areas marked as computed on the individual size pages are derived from the tabulated weight and steel density rather than read from the section table.

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