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Home / Assemblies / UL X310
UL X3104-hr Fire RatingColumnLoad-Bearing
Structural SteelDesign

Steel Column — Concrete fill (HSS)

UL-listed 4-hour fire-rated steel column assembly. HSS rectangular steel column with Concrete fill (HSS), 4-hour fire rating.

Cross-Section Diagram

12COLUMN PROTECTIONSECTION · NOT TO SCALE2 LAYERSsee legend for ① ② ③
Legend
1HSS rectangular steel column(15")
2Concrete fill (HSS)(3.5")

Specifications

Fire Rating
4-Hour
Load Bearing
Yes
Total Thickness
22"
Source / Publisher
UL (Underwriters Laboratories)
Design Number
X310
Assembly Type
Column
Test Standard
UL 263
Construction Group
Non-Combustible
Number of Layers
2 layers

Applicable Codes

IBC 2021 §722NFPA 5000

Construction Summary

HSS rectangular steel column with Concrete fill (HSS), 4-hour fire rating

Material Layers

LayerMaterialThickness
1HSS rectangular steel column15"
2Concrete fill (HSS)3.5"

Important Notice

This assembly listing is for reference only. Always verify against the current UL Product iQ database before specifying in construction documents. Material substitutions may void the fire rating. Consult with a qualified fire protection engineer for project-specific requirements.