49 CFR § 179.221-1 - Individual specification requirements.
---
identifier: "/us/cfr/t49/s179.221-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 179.221-1 - Individual specification requirements."
title_number: 49
title_name: "Transportation"
section_number: "179.221-1"
section_name: "Individual specification requirements."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "179"
part_name: "SPECIFICATIONS FOR TANK CARS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97."
regulatory_source: "29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967."
cfr_part: "179"
---
# 179.221-1 Individual specification requirements.
In addition to § 179.220, the individual specification requirements are as follows:
| DOT specification | Insulation | Burstingpressure(psig) | Minimumplatethickness (inches) | Test pressure (psig) | Bottomoutlet | Bottomwashout | Reference(179.221-***) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 115A60ALW | Yes | 240 | ⁄ | 60 | Optional. | Optional | |
| 115A60W1 | Yes | 240 | ⁄ | 60 | Optional | Optional | 1 |
| 115A60W6 | Yes | 240 | ⁄ | 60 | Optional | Optional | 1 |
[Amdt. 170-52, 61 FR 28681, June 5, 1996, as amended at 62 FR 51561, Oct. 1, 1997; 66 FR 45390, Aug. 28, 2001]