Golf ball size: Ø42.67 mm minimum, 45.93 g maximum (R&A / USGA) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/golf-ball/  (CC BY 4.0)
Basis: R&A Rules of Equipment Part 4 (same limits in the USGA rules)
Catalog version: 2026-10-20

Overall (mm): length 42.67, width 42.67, height 42.67
- Diameter not less than 1.680 in (42.67 mm); weight not more than 1.620 oz (45.93 g).
- Dimples are not modelled: holders, tees and displays need only the envelope; give 0.5 mm clearance.

limit  inch / oz  mm / g
minimum diameter  1.680 in  42.67
maximum weight  1.620 oz  45.93

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- R&A: Rules of Equipment, Part 4: conformance of balls — web — Publisher's page; dimensions are facts — https://www.randa.org/roe/the-rules-of-equipment/part-4-conformance-of-balls
- USGA: Equipment rules: balls — web — Publisher's page; dimensions are facts — https://www.usga.org/etc/designs/usga/content/rule-book/clubs-balls/rule-14611.html

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/golf-ball/index.json
API: https://xemstudio.com/api/geometry?object=golf-ball