L8x4x3/4 — Dimensions and Section Properties

Dimensions and key properties

L8x4x3/4 drawn to the proportions tabulated below, with the axes at the centroid, x̄ = 0.95″ and ȳ = 2.94″. z is the principal axis of least radius of gyration, the one a compression check uses. The toe radii are not drawn.

Weight: = 28.7 lb/ft
A: = 8.49 in²
d: = 8 in
b: = 4 in
t: = 0.75 in
Ix: = 55 in⁴
Sx: = 10.9 in³
Zx: = 18.9 in³
rx: = 2.55 in
ry: = 1.05 in
rz: = 0.85 in

Section properties

Property	Value	Unit	Description
Weight	28.7	lb/ft	Nominal weight per foot
A	8.49	in²	Cross-sectional area
d	8	in	Long leg
b	4	in	Short leg
t	0.75	in	Leg thickness
Ix	55	in⁴	Moment of inertia, strong axis
Sx	10.9	in³	Elastic section modulus, strong axis
Zx	18.9	in³	Plastic section modulus, strong axis
rx	2.55	in	Radius of gyration, strong axis
Iy	9.37	in⁴	Moment of inertia, weak axis
Sy	3.07	in³	Elastic section modulus, weak axis
Zy	5.82	in³	Plastic section modulus, weak axis
ry	1.05	in	Radius of gyration, weak axis
Iz	6.14	in⁴	Moment of inertia, principal z axis
Sz	2.65	in³	Elastic section modulus, principal z axis
rz	0.85	in	Radius of gyration, principal z axis

Other sizes in the L8x4 series

← L8x4x7/8 (heavier)All 7 L8x4 sizes L8x4x5/8 (lighter) →

Nearby angles at a similar d

L10x10x3/4d 10 in · 49.1 lb/ft
L10x10x7/8d 10 in · 56.9 lb/ft
L12x12x1d 12 in · 77.8 lb/ft
L8x6x5/8d 8 in · 28.5 lb/ft
L8x8x9/16d 8 in · 29.6 lb/ft
L8x8x1/2d 8 in · 26.4 lb/ft

Relevant tools

Open L8x4x3/4 in the Steel Shape Properties Table
the full table, filtered to this size, ready to compare against another
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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