Flat belt 16 × 1.5 for Ø40 and Ø80 pulleys at 140 mm (loop drawn on the pulleys) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/flat-belt-1-5x16-pulleys-40-80-140/  (CC BY 4.0)
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
- Open flat belt 16 × 1.5 mm drawn on Ø40 and Ø80 pulleys 140 mm apart: inside length = 2√(C² − (R₂ − R₁)²) + R₁·2β + R₂(2π − 2β), β = acos((R₂ − R₁)/C) → 471.36 mm.
- 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  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. 1: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_001.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/belt-and-pulleys-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/flat-belt-1-5x16-pulleys-40-80-140/index.json
API: https://xemstudio.com/api/geometry?object=flat-belt-1-5x16-pulleys-40-80-140