Brake strap 20 × 1.5 wrapped 228.78° round a Ø60 drum, eyes on Ø4 pins 24 mm apart — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/brake-strap-20x1-5-drum60-pins24/  (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 63.0, width 83.0, height 20.0
- Steel strap 20 wide, 1.5 thick, bent to the Ø60 drum (inside radius 30, line on line) over 228.78°, its two straight legs running tangent from the drum to eyes (Ø4 bore) round the lever's two pins, 24 mm apart and 48 mm below the drum's axis; drawn at its working shape.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
strap  20 × 1.5
wrap  228.78°
eyes  Ø4, 24 mm apart

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. 242: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_242.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/crane-strap-brake-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/brake-strap-20x1-5-drum60-pins24/index.json
API: https://xemstudio.com/api/geometry?object=brake-strap-20x1-5-drum60-pins24