L7x4x3/4 — Dimensions and Section Properties

Dimensions and key properties

L7x4x3/4 drawn to the proportions tabulated below, with the axes at the centroid, x̄ = 1″ and ȳ = 2.5″. z is the principal axis of least radius of gyration, the one a compression check uses. The toe radii are not drawn.

Weight: = 26.2 lb/ft
A: = 7.74 in²
d: = 7 in
b: = 4 in
t: = 0.75 in
Ix: = 37.8 in⁴
Sx: = 8.39 in³
Zx: = 14.8 in³
rx: = 2.21 in
ry: = 1.08 in
rz: = 0.855 in

Section properties

Property	Value	Unit	Description
Weight	26.2	lb/ft	Nominal weight per foot
A	7.74	in²	Cross-sectional area
d	7	in	Long leg
b	4	in	Short leg
t	0.75	in	Leg thickness
Ix	37.8	in⁴	Moment of inertia, strong axis
Sx	8.39	in³	Elastic section modulus, strong axis
Zx	14.8	in³	Plastic section modulus, strong axis
rx	2.21	in	Radius of gyration, strong axis
Iy	9	in⁴	Moment of inertia, weak axis
Sy	3.01	in³	Elastic section modulus, weak axis
Zy	5.6	in³	Plastic section modulus, weak axis
ry	1.08	in	Radius of gyration, weak axis
Iz	5.63	in⁴	Moment of inertia, principal z axis
Sz	2.56	in³	Elastic section modulus, principal z axis
rz	0.855	in	Radius of gyration, principal z axis

Other sizes in the L7x4 series

All 5 L7x4 sizes L7x4x5/8 (lighter) →

Relevant tools

Steel Shape Properties Table
search and compare L7x4x3/4 against other sections
Beam Shear, Moment and Deflection Diagram Calculator
find the moment this section has to carry, and how far it deflects under load
ASTM A36
the preferred grade for angles

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