{"data":{"id":"us/49-cfr-179.202-4","jurisdiction":"us","citation":"49 CFR 179.202-4","heading":"-4 Thickness of plates.","body":"The wall thickness after the forming of the tank shell and heads must be, at a minimum, 9/16 of an inch AAR TC-128 Grade B, normalized steel, in accordance with § 179.200-7(b).","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"2325dc517e7c33cc97dd9296ffb3db2a8e323c8d1e5544c9f5c6bfe403bb5b8a","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.202-3","next":"us/49-cfr-179.202-5"},"notice":"GroundRules: Original legal text. Not legal advice."}