Traxxas 5120A ball bearing, 12 × 18 × 4 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/traxxas-5120a-ball-bearings-black-rubber-sealed-12x18x4mm/  (sheet CC BY 4.0)
Basis: Maker's parts list (Traxxas)
Catalog version: 2026-10-20

Overall (mm): length 18.01, width 18.01, height 4.01
- Traxxas part 5120A: Ball bearings, black rubber sealed (12x18x4mm) (2). Size exactly as printed in Traxxas's parts list; the file is built from that size only.
- Bearing envelope 12 × 18 × 4 mm (bore × OD × width).
- True size, no printing tolerance added.

dimension  value
part number  Traxxas 5120A
name (as printed)  Ball bearings, black rubber sealed (12x18x4mm) (2)
size (as printed)  12x18x4mm
bore  12 mm
outside diameter  18 mm
width  4 mm
seals / balls  as printed in the name; not modelled
used in  Traxxas TRX-4 2021 Ford Bronco (1/10 crawler, 92076-4)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Traxxas (sheet hosted by Monsterhopups): TRX-4 Unassembled Kit (Model 82016-4) parts list, REV. 230615 0246, p. 1 — web — Publisher's page; dimensions are facts — https://www.monsterhopups.de/media/image/storage/opc/anleitung_traxxas/82016-4_parts.pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/traxxas-5120a-ball-bearings-black-rubber-sealed-12x18x4mm/index.json
API: https://xemstudio.com/api/geometry?object=traxxas-5120a-ball-bearings-black-rubber-sealed-12x18x4mm