A36 square tubing is commonly discussed for its tension strength, but it is not typically recommended for strength-critical applications due to its inferior material properties compared to stronger steel alloys. Users are advised to consult catalogs from various suppliers for detailed strength charts, including yield strength values. The MIL-HDBK-5J is a valuable resource for material properties, although it does not cover A36 specifically. It's crucial to ensure that the steel used is certified for the required strength, especially in safety-critical applications. Proper material selection is essential for any design where strength is a concern.