V-groove pulley Ø45 × 10, 40° groove, for a Ø5 round band, Ø8 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/v-groove-pulley-45-40deg-band5-bore8/  (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 45.0, width 45.0, height 10.0
- Ø45 × 10 pulley with a 40° V groove whose apex is on a Ø24 circle: a Ø5 round band wedges between the flanks with its centre on a Ø38.62 circle, touching each flank on a line.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
outside Ø  45 mm
groove  40° V, apex Ø24
band centre Ø  38.62 mm
width  10 mm
bore  Ø8

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. 258: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_258.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/v-groove-pulleys-round-band-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/v-groove-pulley-45-40deg-band5-bore8/index.json
API: https://xemstudio.com/api/geometry?object=v-groove-pulley-45-40deg-band5-bore8