49 CFR § 230.99 - Tender truck axles.

---
identifier: "/us/cfr/t49/s230.99"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 230.99 - Tender truck axles."
title_number: 49
title_name: "Transportation"
section_number: "230.99"
section_name: "Tender truck axles."
chapter_name: "FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "230"
part_name: "STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 20103, 20107, 20702; 28 U.S.C. 2461 note; and 49 CFR 1.89."
regulatory_source: "64 FR 62865, Nov. 17, 1999, unless otherwise noted."
cfr_part: "230"
---


# 230.99 Tender truck axles.

The minimum diameters of axles for various axle loads shall be as follows:

| Axle load (in pounds) | Minimumdiameter of journal(in inches) | Minimumdiameter of wheel seat(in inches) | Minimumdiameter of center(in inches) |
| --- | --- | --- | --- |
| 50000 | 5⁄ | 7⁄ | 6⁄ |
| 38000 | 5 | 6⁄ | 5⁄ |
| 31000 | 4⁄ | 6⁄ | 5⁄ |
| 22000 | 3⁄ | 5 | 4⁄ |
| 15000 | 3⁄ | 4⁄ | 3⁄ |