Flat belt 16 × 1.5 for a Ø40 / Ø80 drive at 140 mm with a Ø30 jockey pulley (loop drawn) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/flat-belt-16x1-5-jockey-drive-40-80-c140/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 203.0, width 83.0, height 16.0
- 16 × 1.5 mm belt on Ø40 and Ø80 pulleys 140 mm apart, its slack (upper) strand pressed 8 mm in by a Ø30 jockey pulley on its back: inside length 472.33 mm, 0.98 mm more than the plain open belt (471.36 mm) — the slack the jockey takes up.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
width × thickness  16 × 1.5 mm
inside length  472.33 mm
open-belt length  471.36 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 5: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_005.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/jockey-pulley-belt-tightener-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/flat-belt-16x1-5-jockey-drive-40-80-c140/index.json
API: https://xemstudio.com/api/geometry?object=flat-belt-16x1-5-jockey-drive-40-80-c140