49 CFR § 179.101-1 - Individual specification requirements.

---
identifier: "/us/cfr/t49/s179.101-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 179.101-1 - Individual specification requirements."
title_number: 49
title_name: "Transportation"
section_number: "179.101-1"
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"
---


# 179.101-1 Individual specification requirements.

In addition to § 179.100, the individual specification requirements are as follows:

| DOT specification | Insulation | Bursting pressure (psig) | Minimum plate thickness (inches) | Test pressure (psig) | Manway cover thickness | Bottom outlet | Bottom washout | Reference(179.***) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 105A100ALW | Yes | 500 | 5/8 | 100 | 2 1/2 | No | No |  |
| 105A200ALW | Yes | 500 | 5/8 | 200 | 2 1/2 | No | No |  |
| 105A300ALW | Yes | 750 | 5/8 | 300 | 2 5/8 | No | No |  |
| 105A100W | Yes | 500 | 9/16 | 100 | 2 1/4 | No | No |  |
| 105A200W | Yes | 500 | 9/16 | 200 | 2 1/4 | No | No |  |
| 105A300W | Yes | 750 | 11/16 | 300 | 2 1/4 | No | No |  |
| 105A400W | Yes | 1,000 | 11/16 | 400 | 2 1/4 | No | No |  |
| 105A500W | Yes | 1,250 | 11/16 | 500 | 2 1/4 | No | No | 102-1, 102-2 |
| 105A600W | Yes | 1,500 | 11/16 | 600 | 2 1/4 | No | No | 102-4, 102-17 |
| 109A100ALW | Optional | 500 | 5/8 | 100 | 2 1/2 | No | Optional |  |
| 109A200ALW | Optional | 500 | 5/8 | 200 | 2 1/2 | No | Optional |  |
| 109A300ALW | Optional | 750 | 5/8 | 300 | 2 5/8 | No | Optional |  |
| 109A300W | Optional | 500 | 11/16 | 300 | 2 1/4 | No | Optional |  |
| 112A200W | Optional | 500 | 9/16 | 200 | 2 1/4 | No | No |  |
| 112A340W | Optional | 850 | 11/16 | 340 | 2 1/4 | No | No |  |
| 112A400W | Optional | 1,000 | 11/16 | 400 | 2 1/4 | No | No |  |
| 112A500W | Optional | 1,250 | 11/16 | 500 | 2 1/4 | No | No |  |
| 114A340W | Optional | 850 | 11/16 | 340 |  | Optional | Optional | 103 |
| 114A400W | Optional | 1,000 | 11/16 | 400 |  | Optional | Optional | 103 |
| 120A200ALW | Yes | 500 | 5/8 | 200 | 2 1/2 | Optional | Optional | 103 |
| 120A100W | Yes | 500 | 9/16 | 100 | 2 1/4 | Optional | Optional | 103 |
| 120A200W | Yes | 500 | 9/16 | 200 | 2 1/4 | Optional | Optional | 103 |
| 120A300W | Yes | 750 | 11/16 | 300 | 2 1/4 | Optional | Optional | 103 |
| 120A400W | Yes | 1,000 | 11/16 | 400 | 2 1/4 | Optional | Optional | 103 |
| 120A500W | Yes | 1,250 | 11/16 | 500 | 2 1/4 | Optional | Optional | 103 |
| When steel of 65,000 to 81,000 p.s.i. minimum tensile strength is used, the thickness of plates shall be not less than ⁄ inch, and when steel of 81,000 p.s.i. minimum tensile strength is used, the minimum thickness of plate shall be not less than ⁄ inch. |  |  |  |  |  |  |  |  |
| When approved material other than aluminum alloys are used, the thickness shall be not less than 2⁄ inches. |  |  |  |  |  |  |  |  |
| When steel of 65,000 p.s.i. minimum tensile strength is used, minimum thickness of plates shall be not less than ⁄ inch. |  |  |  |  |  |  |  |  |
| Tank cars not equipped with a thermal protection or an insulation system used for the transportation of a Class 2 (compressed gas) material must have at least the upper two-thirds of the exterior of the tank, including manway nozzle and all appurtenances in contact with this area, finished with a reflective coat of white paint. |  |  |  |  |  |  |  |  |
| For inside diameter of 87 inches or less, the thickness of plates shall be not less than ⁄ inch. |  |  |  |  |  |  |  |  |
| See AAR Specifications for Tank Cars, appendix E, E4.01 (IBR, see § 171.7 of this subchapter), and § 179.103-2. |  |  |  |  |  |  |  |  |
| When the use of nickel is required by the lading, the thickness shall not be less than two inches. |  |  |  |  |  |  |  |  |

[Amdt. 179-52, 61 FR 28679, June 5, 1996, as amended at 66 FR 45390, Aug. 28, 2001; 68 FR 75760, Dec. 31, 2003]